{"id":1133,"date":"2020-07-22T22:49:19","date_gmt":"2020-07-22T14:49:19","guid":{"rendered":"https:\/\/jimmyswebnote.com\/?p=1133"},"modified":"2020-08-19T16:48:26","modified_gmt":"2020-08-19T08:48:26","slug":"array-methods-list","status":"publish","type":"post","link":"https:\/\/jimmyswebnote.com\/array-methods-list\/","title":{"rendered":"\u3010JavaScript\u57fa\u790e\u3011\uff1aArray Methods \u2014 \u9663\u5217\u65b9\u6cd5\u6574\u7406"},"content":{"rendered":"\n<p>\u9663\u5217(array)\u5c6c\u65bc\u7269\u4ef6(object)\u7684\u4e00\u7a2e\uff0c\u5728Javacript\u4e2d\u6709\u8a31\u591a\u9663\u5217\u65b9\u6cd5(array methods)\u53ef\u505a\u8f49\u63db\u6216\u904b\u7b97\uff0c\u4f86\u6574\u7406\u4e00\u4e0b\u5728<a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\" target=\"_blank\" aria-label=\"MDN (opens in a new tab)\" rel=\"noreferrer noopener\" class=\"rank-math-link\">MDN<\/a>\u770b\u5230\u9663\u5217\u5e38\u898b\u548c\u76f8\u95dc\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662f79df23cd0\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662f79df23cd0\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#1_Array_and_String%EF%BC%9A%E9%99%A3%E5%88%97%E8%88%87%E5%AD%97%E4%B8%B2%E7%9A%84%E8%BD%89%E6%8F%9B\" title=\"1. Array and String\uff1a\u9663\u5217\u8207\u5b57\u4e32\u7684\u8f49\u63db\">1. Array and String\uff1a\u9663\u5217\u8207\u5b57\u4e32\u7684\u8f49\u63db<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#11_%E5%AD%97%E4%B8%B2%E8%BD%89%E6%8F%9B%E6%88%90%E9%99%A3%E5%88%97\" title=\"1.1 \u5b57\u4e32\u8f49\u63db\u6210\u9663\u5217\">1.1 \u5b57\u4e32\u8f49\u63db\u6210\u9663\u5217<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#111_Arrayfrom\" title=\"1.1.1 Array.from()\">1.1.1 Array.from()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#112_strsplit\" title=\"1.1.2 str.split()\">1.1.2 str.split()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#12_%E9%99%A3%E5%88%97%E8%BD%89%E6%8F%9B%E6%88%90%E5%AD%97%E4%B8%B2\" title=\"1.2 \u9663\u5217\u8f49\u63db\u6210\u5b57\u4e32\">1.2 \u9663\u5217\u8f49\u63db\u6210\u5b57\u4e32<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#121_arrjoin\" title=\"1.2.1 arr.join()\">1.2.1 arr.join()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#122_Stringarr\" title=\"1.2.2 String(arr)\">1.2.2 String(arr)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#123_arrtoString\" title=\"1.2.3 arr.toString()\">1.2.3 arr.toString()<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#2_Array_methods_%E2%80%93_%E9%99%A3%E5%88%97%E6%96%B9%E6%B3%95%EF%BC%9A%E9%87%9D%E5%B0%8D%E9%99%A3%E5%88%97%E6%93%8D%E4%BD%9C\" title=\"2. Array methods &#8211; \u9663\u5217\u65b9\u6cd5\uff1a\u91dd\u5c0d\u9663\u5217\u64cd\u4f5c\">2. Array methods &#8211; \u9663\u5217\u65b9\u6cd5\uff1a\u91dd\u5c0d\u9663\u5217\u64cd\u4f5c<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#21_%E5%88%A4%E6%96%B7%E6%98%AF%E5%90%A6%E7%82%BA%E9%99%A3%E5%88%97\" title=\"2.1 \u5224\u65b7\u662f\u5426\u70ba\u9663\u5217\">2.1 \u5224\u65b7\u662f\u5426\u70ba\u9663\u5217<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#211_ArrayisArrayarr\" title=\"2.1.1 Array.isArray(arr)\">2.1.1 Array.isArray(arr)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#22_%E6%96%B0%E5%A2%9E%E5%85%83%E7%B4%A0%E5%88%B0%E9%99%A3%E5%88%97\" title=\"2.2 \u65b0\u589e\u5143\u7d20\u5230\u9663\u5217\">2.2 \u65b0\u589e\u5143\u7d20\u5230\u9663\u5217<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#221_arrpush\" title=\"2.2.1 arr.push()\">2.2.1 arr.push()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#222_arrunshift\" title=\"2.2.2 arr.unshift()\">2.2.2 arr.unshift()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#23_%E5%88%AA%E9%99%A4%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0\" title=\"2.3 \u522a\u9664\u9663\u5217\u4e2d\u7684\u5143\u7d20\">2.3 \u522a\u9664\u9663\u5217\u4e2d\u7684\u5143\u7d20<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#231_arrpop\" title=\"2.3.1 arr.pop()\">2.3.1 arr.pop()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#232_arrshift\" title=\"2.3.2 arr.shift()\">2.3.2 arr.shift()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#233_delete_arri\" title=\"2.3.3 delete arr[i]\">2.3.3 delete arr[i]<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#23_%E5%88%AA%E9%99%A4%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0%EF%BC%8C%E4%B8%A6%E5%90%8C%E6%99%82%E6%96%B0%E5%A2%9E%E5%85%83%E7%B4%A0%E5%88%B0%E9%99%A3%E5%88%97%E4%B8%AD\" title=\"2.3 \u522a\u9664\u9663\u5217\u4e2d\u7684\u5143\u7d20\uff0c\u4e26\u540c\u6642\u65b0\u589e\u5143\u7d20\u5230\u9663\u5217\u4e2d\">2.3 \u522a\u9664\u9663\u5217\u4e2d\u7684\u5143\u7d20\uff0c\u4e26\u540c\u6642\u65b0\u589e\u5143\u7d20\u5230\u9663\u5217\u4e2d<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#231_arrsplice\" title=\"2.3.1 arr.splice()\">2.3.1 arr.splice()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#24_%E6%88%AA%E5%8F%96%E9%99%A3%E5%88%97%E7%9A%84%E6%9F%90%E4%B8%80%E6%AE%B5%EF%BC%8C%E4%B8%A6%E5%9B%9E%E5%82%B3\" title=\"2.4 \u622a\u53d6\u9663\u5217\u7684\u67d0\u4e00\u6bb5\uff0c\u4e26\u56de\u50b3\">2.4 \u622a\u53d6\u9663\u5217\u7684\u67d0\u4e00\u6bb5\uff0c\u4e26\u56de\u50b3<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#241_arrslice\" title=\"2.4.1 arr.slice()\">2.4.1 arr.slice()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#25_%E5%90%88%E4%BD%B5%E5%A4%9A%E5%80%8B%E9%99%A3%E5%88%97\" title=\"2.5 \u5408\u4f75\u591a\u500b\u9663\u5217\">2.5 \u5408\u4f75\u591a\u500b\u9663\u5217<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#251_arrconcat\" title=\" 2.5.1 arr.concat()\"> 2.5.1 arr.concat()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#26_%E7%94%A8%E6%9F%90%E5%80%8B%E5%85%83%E7%B4%A0%E5%A1%AB%E6%BB%BF%E9%99%A3%E5%88%97\" title=\"2.6 \u7528\u67d0\u500b\u5143\u7d20\u586b\u6eff\u9663\u5217\">2.6 \u7528\u67d0\u500b\u5143\u7d20\u586b\u6eff\u9663\u5217<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#261_arrfill\" title=\"2.6.1 arr.fill()\">2.6.1 arr.fill()<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#3_Array_methods_%E2%80%93_%E9%99%A3%E5%88%97%E6%96%B9%E6%B3%95%EF%BC%9A%E9%87%9D%E5%B0%8D%E6%AF%8F%E5%80%8B%E5%85%83%E7%B4%A0%E6%93%8D%E4%BD%9C\" title=\"3. Array methods &#8211; \u9663\u5217\u65b9\u6cd5\uff1a\u91dd\u5c0d\u6bcf\u500b\u5143\u7d20\u64cd\u4f5c\">3. Array methods &#8211; \u9663\u5217\u65b9\u6cd5\uff1a\u91dd\u5c0d\u6bcf\u500b\u5143\u7d20\u64cd\u4f5c<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#31_%E5%B0%8D%E9%99%A3%E5%88%97%E7%9A%84%E6%AF%8F%E5%80%8B%E5%85%83%E7%B4%A0%E5%9F%B7%E8%A1%8C%E6%9F%90%E5%87%BD%E6%95%B8\" title=\"3.1 \u5c0d\u9663\u5217\u7684\u6bcf\u500b\u5143\u7d20\u57f7\u884c\u67d0\u51fd\u6578\">3.1 \u5c0d\u9663\u5217\u7684\u6bcf\u500b\u5143\u7d20\u57f7\u884c\u67d0\u51fd\u6578<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#311_arrforEach\" title=\"3.1.1 arr.forEach()\">3.1.1 arr.forEach()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#312_arrmap\" title=\"3.1.2 arr.map()\">3.1.2 arr.map()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#32_%E7%94%A8%E6%9F%90%E5%87%BD%E6%95%B8%E9%81%8E%E6%BF%BE%E9%99%A3%E5%88%97\" title=\"3.2 \u7528\u67d0\u51fd\u6578\u904e\u6ffe\u9663\u5217\">3.2 \u7528\u67d0\u51fd\u6578\u904e\u6ffe\u9663\u5217<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#321_arrfilter\" title=\"3.2.1 arr.filter()\">3.2.1 arr.filter()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#33_%E5%B0%8B%E6%89%BE%E9%99%A3%E5%88%97%E4%B8%AD%E6%98%AF%E5%90%A6%E5%8C%85%E5%90%AB%E6%9F%90%E5%85%83%E7%B4%A0\" title=\"3.3 \u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u5305\u542b\u67d0\u5143\u7d20\">3.3 \u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u5305\u542b\u67d0\u5143\u7d20<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#331_arrindexOf\" title=\"3.3.1 arr.indexOf()\">3.3.1 arr.indexOf()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#332_arrlastIndexOf\" title=\"3.3.2 arr.lastIndexOf()\">3.3.2 arr.lastIndexOf()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#333_arrincludes\" title=\"3.3.3 arr.includes()\">3.3.3 arr.includes()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#34_%E5%B0%8B%E6%89%BE%E9%99%A3%E5%88%97%E4%B8%AD%E6%98%AF%E5%90%A6%E6%9C%89%E7%AC%A6%E5%90%88%E6%9F%90%E5%87%BD%E6%95%B8%E6%A2%9D%E4%BB%B6%E7%9A%84%E5%85%83%E7%B4%A0\" title=\"3.4 \u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\u7684\u5143\u7d20\">3.4 \u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\u7684\u5143\u7d20<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#341_arrfindIndex\" title=\"3.4.1 arr.findIndex()\">3.4.1 arr.findIndex()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#342_arrfind\" title=\"3.4.2 arr.find()\">3.4.2 arr.find()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#35_%E6%AF%94%E5%B0%8D%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0%E6%98%AF%E5%90%A6%E7%AC%A6%E5%90%88%E6%9F%90%E5%87%BD%E6%95%B8%E6%A2%9D%E4%BB%B6\" title=\"3.5 \u6bd4\u5c0d\u9663\u5217\u4e2d\u7684\u5143\u7d20\u662f\u5426\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\">3.5 \u6bd4\u5c0d\u9663\u5217\u4e2d\u7684\u5143\u7d20\u662f\u5426\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#351_arrevery\" title=\"3.5.1 arr.every()\">3.5.1 arr.every()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#352_arrsome\" title=\"3.5.2 arr.some()\">3.5.2 arr.some()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#36_%E6%8E%92%E5%88%97%E9%99%A3%E5%88%97%E5%85%83%E7%B4%A0\" title=\"3.6 \u6392\u5217\u9663\u5217\u5143\u7d20\">3.6 \u6392\u5217\u9663\u5217\u5143\u7d20<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#361_arrreverse\" title=\"3.6.1 arr.reverse()\">3.6.1 arr.reverse()<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#362_arrsort\" title=\"3.6.2 arr.sort()\">3.6.2 arr.sort()<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#37_%E5%B0%87%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0%E5%B1%A4%E5%B1%A4%E5%9F%B7%E8%A1%8C%E6%9F%90%E5%87%BD%E6%95%B8\" title=\"3.7 \u5c07\u9663\u5217\u4e2d\u7684\u5143\u7d20\u5c64\u5c64\u57f7\u884c\u67d0\u51fd\u6578\">3.7 \u5c07\u9663\u5217\u4e2d\u7684\u5143\u7d20\u5c64\u5c64\u57f7\u884c\u67d0\u51fd\u6578<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/#371_arrreduce\" title=\"3.7.1 arr.reduce()\">3.7.1 arr.reduce()<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1_Array_and_String%EF%BC%9A%E9%99%A3%E5%88%97%E8%88%87%E5%AD%97%E4%B8%B2%E7%9A%84%E8%BD%89%E6%8F%9B\"><\/span>1. Array and String\uff1a\u9663\u5217\u8207\u5b57\u4e32\u7684\u8f49\u63db<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5b57\u4e32\u8207\u9663\u5217\u76f8\u95dc\u7684\u65b9\u6cd5<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"11_%E5%AD%97%E4%B8%B2%E8%BD%89%E6%8F%9B%E6%88%90%E9%99%A3%E5%88%97\"><\/span>1.1 \u5b57\u4e32\u8f49\u63db\u6210\u9663\u5217<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"111_Arrayfrom\"><\/span>1.1.1 <strong>Array.from()<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u9019\u500b\u65b9\u6cd5\u4e0d\u53ea\u53ef\u4ee5\u8f49\u63db\u5b57\u4e32\uff0c\u9084\u53ef\u4ee5\u8f49\u63db\u985e\u9663\u5217\u7b49\u7b49\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-style-default\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">Array.from(arrayLike [, mapFn [, thisArg]])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">console.log(Array.from('foo'));\n\/\/ expected output: Array [\"f\", \"o\", \"o\"]<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"112_strsplit\"><\/span>1.1.2 str.split()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u9019\u500b\u65b9\u6cd5\u53ef\u4ee5\u6c7a\u5b9a\u8981\u7528\u751a\u9ebc\u5b57\u5143\u4f86\u5207\u5272\u5b57\u4e32\uff0c\u4f9d\u64da\u8a72\u5b57\u5143\u5207\u5272\u5b57\u4e32\u5f8c\u518d\u5206\u5225\u653e\u5230\u9663\u5217\u4e2d\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">str.split([separator[, limit]])<\/span><\/p><\/blockquote>\n\n\n\n<p>separator\u653e\u4f60\u60f3\u6839\u64da\u751a\u9ebc\u5b57\u5143\u4f86\u5207\u5272\u5b57\u4e32\uff0climit\u5247\u662f\u4f60\u60f3\u5207\u5272\u5e7e\u500b\u5b57\u4e32\u653e\u5230\u9663\u5217\u4e2d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const myString = 'Hello World. How are you doing?'\nconst splits = myString.split(' ', 3)\n\/\/ \u9047\u5230\u7a7a\u5b57\u4e32\u5247\u5207\u5272\u62102\u500b\u5143\u7d20\uff0c\u5171\u5207\u52723\u500b\u5143\u7d20\u653e\u5230\u9663\u5217\u4e2d\nconsole.log(splits)\n\/\/ [\"Hello\", \"World.\", \"How\"]<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"12_%E9%99%A3%E5%88%97%E8%BD%89%E6%8F%9B%E6%88%90%E5%AD%97%E4%B8%B2\"><\/span>1.2 \u9663\u5217\u8f49\u63db\u6210\u5b57\u4e32<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"121_arrjoin\"><\/span>1.2.1 arr.join()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.join([separator])<\/span><\/p><\/blockquote>\n\n\n\n<p>separator\u70ba\u4f60\u5e0c\u671b\u7528\u751a\u9ebc\u5b57\u5143\u4f86\u9023\u63a5\u9663\u5217\u4e4b\u9593\u7684\u5143\u7d20\uff0c\u5982\u679c\u70ba\u7a7a\u503c\uff0c\u5247\u9810\u8a2d\u6703\u7528\uff0c\u5c07\u5143\u7d20\u5206\u958b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const elements = ['Fire', 'Air', 'Water'];\n\nconsole.log(elements.join());\n\/\/ expected output: \"Fire,Air,Water\"\n\nconsole.log(elements.join(''));\n\/\/ expected output: \"FireAirWater\"\n\nconsole.log(elements.join('-'));\n\/\/ expected output: \"Fire-Air-Water\"<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"122_Stringarr\"><\/span>1.2.2 String(arr)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">String(arr)<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const elements = ['Fire', 'Air', 'Water'];\n\nconsole.log(String(elements));\n\/\/ expected output: \"Fire,Air,Water\"<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"123_arrtoString\"><\/span>1.2.3 arr.toString()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.toString()<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const elements = ['Fire', 'Air', 'Water'];\n\nconsole.log(elements.toString());\n\/\/ expected output: \"Fire,Air,Water\"<\/code><\/pre>\n\n\n\n<p><strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u8981\u6ce8\u610f\u7684\u662f\u53ea\u6709join\u53ef\u4ee5\u9078\u64c7\u8981\u7528\u751a\u9ebc\u5b57\u5143\u9023\u63a5\u9663\u5217\u5143\u7d20\uff0c\u7528toString\u548cString\u5c31\u53ea\u80fd\u7528,\u9023\u63a5\u9663\u5217\u5143\u7d20\u3002<\/span><\/strong><\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"2_Array_methods_%E2%80%93_%E9%99%A3%E5%88%97%E6%96%B9%E6%B3%95%EF%BC%9A%E9%87%9D%E5%B0%8D%E9%99%A3%E5%88%97%E6%93%8D%E4%BD%9C\"><\/span>2. Array methods &#8211; \u9663\u5217\u65b9\u6cd5\uff1a\u91dd\u5c0d\u9663\u5217\u64cd\u4f5c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"21_%E5%88%A4%E6%96%B7%E6%98%AF%E5%90%A6%E7%82%BA%E9%99%A3%E5%88%97\"><\/span>2.1 \u5224\u65b7\u662f\u5426\u70ba\u9663\u5217<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"211_ArrayisArrayarr\"><\/span>2.1.1 Array.isArray(arr)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>Array.isArray(arr)<\/p><\/blockquote>\n\n\n\n<p>arr\u70ba\u4f60\u60f3\u5224\u65b7\u662f\u5426\u70ba\u9663\u5217\u7684\u8cc7\u6599\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">let arr = [2, 4, 6]\n\nconsole.log(Array.isArray(arr)); \/\/true\nconsole.log(Array.isArray([1, 2, 3]));  \/\/ true\nconsole.log(Array.isArray({foo: 123})); \/\/ false\nconsole.log(Array.isArray('foobar'));   \/\/ false\nconsole.log(Array.isArray(undefined));  \/\/ false<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"22_%E6%96%B0%E5%A2%9E%E5%85%83%E7%B4%A0%E5%88%B0%E9%99%A3%E5%88%97\"><\/span>2.2 \u65b0\u589e\u5143\u7d20\u5230\u9663\u5217<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"221_arrpush\"><\/span>2.2.1 arr.push()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u65b0\u589e\u5143\u7d20\u5230\u9663\u5217\u7684<strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u672b\u7aef<\/span><\/strong>\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.push([element1[, \u2026[, elementN]]])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const animals = ['pigs', 'goats', 'sheep'];\n\nconst count = animals.push('cows');\nconsole.log(count);\n\/\/ expected output: 4\nconsole.log(animals);\n\/\/ expected output: Array [\"pigs\", \"goats\", \"sheep\", \"cows\"]<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"222_arrunshift\"><\/span>2.2.2 arr.unshift()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u65b0\u589e\u5143\u7d20\u5230\u9663\u5217\u7684<strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u9996\u7aef<\/span><\/strong>\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.unshift(element1[, \u2026[, elementN]])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const array1 = [1, 2, 3];\n\nconsole.log(array1.unshift(4, 5));\n\/\/ expected output: 5\n\nconsole.log(array1);\n\/\/ expected output: Array [4, 5, 1, 2, 3]<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"23_%E5%88%AA%E9%99%A4%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0\"><\/span>2.3 \u522a\u9664\u9663\u5217\u4e2d\u7684\u5143\u7d20<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"231_arrpop\"><\/span>2.3.1 arr.pop()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u522a\u9664\u9663\u5217\u4e2d\u7684<strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u672b\u7aef\u5143\u7d20<\/span><\/strong>\uff0c\u4e26\u4e14\u56de\u50b3\u88ab\u522a\u9664\u5143\u7d20\u7684\u503c\uff0carr.length\u6703-1\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.pop()<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const plants = ['broccoli', 'cauliflower', 'cabbage', 'kale', 'tomato'];\nconst lastElement = plants.pop()\n\nconsole.log(lastElement);\n\/\/ expected output: \"tomato\"\n\nconsole.log(plants);\n\/\/ expected output: Array [\"broccoli\", \"cauliflower\", \"cabbage\", \"kale\"]<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"232_arrshift\"><\/span>2.3.2 arr.shift()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u522a\u9664\u9663\u5217\u4e2d\u7684<strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u9996\u7aef\u5143\u7d20<\/span><\/strong>\uff0c\u4e26\u4e14\u56de\u50b3\u88ab\u522a\u9664\u5143\u7d20\u7684\u503c\uff0carr.length\u6703-1\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.shift()<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const array1 = [1, 2, 3];\nconst firstElement = array1.shift();\n\nconsole.log(firstElement);\n\/\/ expected output: 1\n\nconsole.log(array1);\n\/\/ expected output: Array [2, 3]\n\n\n<\/code><\/pre>\n\n\n\n<p>\u8981\u6ce8\u610f\u7684\u662f\uff1a<strong><span style=\"color:#ff0000\" class=\"has-inline-color\">arr.pop\u548carr.push\u7684\u6548\u80fd\u6703\u6bd4arr.shift\u548carr.unshift\u4f86\u7684\u597d<\/span><\/strong>\uff0c\u56e0\u70baarr.shift\u548carr.unshift\u9664\u4e86\u5c07\u9996\u7aef\u65b0\u589e\/\u522a\u9664\u5143\u7d20\u5916\uff0c\u9084\u9700\u8981\u628a\u9996\u7aef\u4e4b\u5f8c\u7684\u5143\u7d20\u5f80\u524d\u79fb\/\u5f80\u5f8c\u79fb\uff0c\u6539\u8b8a\u6bcf\u500b\u5143\u7d20\u7684index\uff0c\u4f46arr.pop\u548carr.push\u65b0\u589e\/\u522a\u6e1b\u672b\u7aef\u5143\u7d20\u4e26\u4e0d\u9700\u8981\u6539\u8b8a\u5176\u4ed6\u5143\u7d20\u7684index\uff0c\u53ea\u9700\u8b8a\u52d5length\u5c6c\u6027\u800c\u5df2\u3002<\/p>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"233_delete_arri\"><\/span>2.3.3 delete arr[i]<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u53ef\u4ee5\u522a\u9664\u7b2ci\u9805\u5143\u7d20\uff0c\u4f46\u8981\u6ce8\u610f\u4f7f\u7528delete\u6307\u4ee4\u4e26<span style=\"color:#ff0000\" class=\"has-inline-color\"><strong>\u4e0d\u6703\u6539\u8b8a\u9663\u5217\u7684\u9577\u5ea6<\/strong><\/span>\u3002<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"23_%E5%88%AA%E9%99%A4%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0%EF%BC%8C%E4%B8%A6%E5%90%8C%E6%99%82%E6%96%B0%E5%A2%9E%E5%85%83%E7%B4%A0%E5%88%B0%E9%99%A3%E5%88%97%E4%B8%AD\"><\/span>2.3 \u522a\u9664\u9663\u5217\u4e2d\u7684\u5143\u7d20\uff0c\u4e26\u540c\u6642\u65b0\u589e\u5143\u7d20\u5230\u9663\u5217\u4e2d<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"231_arrsplice\"><\/span>2.3.1 arr.splice()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u53ef\u4ee5\u9078\u64c7\u5f9e\u54ea\u500bindex\u958b\u59cb\u522a\u9664\u5143\u7d20\uff0c\u522a\u9664\u5e7e\u500b\u5143\u7d20\uff0c\u540c\u6642\u65b0\u589e\u90a3\u4e9b\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">array.splice(start[, deleteCount[, item1[, item2[, \u2026]]]])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const months = ['Jan', 'March', 'April', 'June'];\nmonths.splice(1, 0, 'Feb');\n\/\/ \u5f9eindex=1\u958b\u59cb\u522a\u96640\u500b\u5143\u7d20\uff0c\u4e26\u65b0\u589e'Feb'\u3002\nconsole.log(months);\n\/\/ expected output: Array [\"Jan\", \"Feb\", \"March\", \"April\", \"June\"]\n\nmonths.splice(4, 1, 'May');\n\/\/ \u5f9eindex=4\u958b\u59cb\u522a\u96641\u500b\u5143\u7d20\uff0c\u4e26\u65b0\u589e'May'\u3002\nconsole.log(months);\n\/\/ expected output: Array [\"Jan\", \"Feb\", \"March\", \"April\", \"May\"]\n\nmonths.splice(2,2);\n\/\/ \u5f9eindex=2\u958b\u59cb\u522a\u96642\u500b\u5143\u7d20\nconsole.log(months);\n\/\/ expected output: Array [\"Jan\", \"Feb\", \"May\"]\n\nmonths.splice(3, 0, 'June', 'July');\n\/\/ \u5f9eindex=3\u958b\u59cb\u522a\u96640\u500b\u5143\u7d20\uff0c\u4e26\u65b0\u589e'June', 'July'\nconsole.log(months);\n\/\/ expected output: Array [\"Jan\", \"Feb\", \"May\", \"June\", \"July\"]\n\nmonths.splice(-3, 2, 'August');\n\/\/ \u5f9eindex=-3(\u6700\u5f8c\u4e00\u500b\u5143\u7d20index=-1)\u958b\u59cb\u522a\u96642\u500b\u5143\u7d20\uff0c\u4e26\u65b0\u589e'August'\nconsole.log(months);\n\/\/ expected output: Array [\"Jan\", \"Feb\", \"August\", \"July\"]<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"24_%E6%88%AA%E5%8F%96%E9%99%A3%E5%88%97%E7%9A%84%E6%9F%90%E4%B8%80%E6%AE%B5%EF%BC%8C%E4%B8%A6%E5%9B%9E%E5%82%B3\"><\/span>2.4 \u622a\u53d6\u9663\u5217\u7684\u67d0\u4e00\u6bb5\uff0c\u4e26\u56de\u50b3<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"241_arrslice\"><\/span>2.4.1 arr.slice()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u6b64\u65b9\u6cd5\u4e0d\u6703\u6539\u8b8a\u539f\u4f86\u9663\u5217\u7684\u503c\uff01<\/span><\/strong><\/p>\n\n\n\n<p>\u622a\u53d6\u9663\u5217\u4e2d\u7684\u67d0\u4e00\u6bb5\uff0c\u4e26\u4e14\u56de\u50b3\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.slice([start[, end]])<\/span><\/p><\/blockquote>\n\n\n\n<p>\u5f9eindex = start \u958b\u59cb\u622a\u53d6\u5230 index = end\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const animals = ['ant', 'bison', 'camel', 'duck', 'elephant'];\n\nconsole.log(animals.slice(2));\n\/\/ expected output: Array [\"camel\", \"duck\", \"elephant\"]\n\nconsole.log(animals.slice(2, 4));\n\/\/ expected output: Array [\"camel\", \"duck\"]\n\nconsole.log(animals.slice(1, 5));\n\/\/ expected output: Array [\"bison\", \"camel\", \"duck\", \"elephant\"]\n\nconsole.log(animals.slice(-2))\n\/\/ expected output: Array ['duck', 'elephant']\n\nconsole.log(animals);\n\/\/ expected output: Array ['ant', 'bison', 'camel', 'duck', 'elephant'];<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"25_%E5%90%88%E4%BD%B5%E5%A4%9A%E5%80%8B%E9%99%A3%E5%88%97\"><\/span>2.5 \u5408\u4f75\u591a\u500b\u9663\u5217<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"251_arrconcat\"><\/span> 2.5.1 arr.concat()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><strong><span style=\"color:#ff0000\" class=\"has-inline-color\"><strong>\u6b64\u65b9\u6cd5\u4e0d\u6703\u6539\u8b8a\u539f\u4f86\u9663\u5217\u7684\u503c\uff01<\/strong><\/span><\/strong><\/p>\n\n\n\n<p>\u7528\u4f86\u5408\u4f75\u4e00\u500b\u6216\u591a\u500b\u9663\u5217\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">const new_array = old_array.concat([value1[, value2[, \u2026[, valueN]]]])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">let num1 = [1, 2, 3];\nlet num2 = [4, 5, 6];\nlet num3 = [7, 8, 9];\nlet numbers = num1.concat(num2, num3);\n\nconsole.log(numbers); \n\/\/ results in [1, 2, 3, 4, 5, 6, 7, 8, 9]\nconsole.log(num1);\n\/\/ results in [1, 2, 3]\n\nnum1 = [[1]];\nnum2 = [2, [3]];\nnumbers = num1.concat(num2);\n\nconsole.log(numbers);\n\/\/ results in [[1], 2, [3]]<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"26_%E7%94%A8%E6%9F%90%E5%80%8B%E5%85%83%E7%B4%A0%E5%A1%AB%E6%BB%BF%E9%99%A3%E5%88%97\"><\/span>2.6 \u7528\u67d0\u500b\u5143\u7d20\u586b\u6eff\u9663\u5217<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"261_arrfill\"><\/span>2.6.1 arr.fill()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u53ef\u4ee5\u6c7a\u5b9a\u5f9estart index\u5230 end index\uff0c\u7528\u67d0\u5143\u7d20\u586b\u6eff\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.fill(value[, start[, end]])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const array1 = [1, 2, 3, 4];\n\n\/\/ \u7528'0'\u586b\u6effindex = 2\u5230index = 4\nconsole.log(array1.fill(0, 2, 4));\n\/\/ expected output: [1, 2, 0, 0]\n\n\/\/ \u7528'5'\u586b\u6effindex = 1\u4e4b\u5f8c\u7684\u5143\u7d20\nconsole.log(array1.fill(5, 1));\n\/\/ expected output: [1, 5, 5, 5]\n\n\/\/\u7528'6'\u586b\u6eff\u9663\u5217\nconsole.log(array1.fill(6));\n\/\/ expected output: [6, 6, 6, 6]<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"3_Array_methods_%E2%80%93_%E9%99%A3%E5%88%97%E6%96%B9%E6%B3%95%EF%BC%9A%E9%87%9D%E5%B0%8D%E6%AF%8F%E5%80%8B%E5%85%83%E7%B4%A0%E6%93%8D%E4%BD%9C\"><\/span>3. Array methods &#8211; \u9663\u5217\u65b9\u6cd5\uff1a\u91dd\u5c0d\u6bcf\u500b\u5143\u7d20\u64cd\u4f5c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"31_%E5%B0%8D%E9%99%A3%E5%88%97%E7%9A%84%E6%AF%8F%E5%80%8B%E5%85%83%E7%B4%A0%E5%9F%B7%E8%A1%8C%E6%9F%90%E5%87%BD%E6%95%B8\"><\/span>3.1 \u5c0d\u9663\u5217\u7684\u6bcf\u500b\u5143\u7d20\u57f7\u884c\u67d0\u51fd\u6578<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"311_arrforEach\"><\/span>3.1.1 arr.forEach()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u55ae\u7d14\u5c0d\u9663\u5217\u7684\u6240\u6709\u5143\u7d20\u90fd\u57f7\u884c\u67d0\u500b\u51fd\u6578\uff0c\u4e26\u4e0d\u6703\u56de\u50b3\u503c\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.forEach(callback(currentValue [, index [, array]])[, thisArg])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const arraySparse = [1,3,,7]\nlet numCallbackRuns = 0\n\narraySparse.forEach((element) => {\n  console.log(element)\n  numCallbackRuns++\n})\n\nconsole.log(\"numCallbackRuns: \", numCallbackRuns)\n\n\/\/ 1\n\/\/ 3\n\/\/ 7\n\/\/ numCallbackRuns: 3<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"312_arrmap\"><\/span>3.1.2 arr.map()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><strong><strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u6b64\u65b9\u6cd5\u4e0d\u6703\u6539\u8b8a\u539f\u4f86\u9663\u5217\u7684\u503c\uff01<\/span><\/strong><\/strong><\/p>\n\n\n\n<p>\u5c07\u9663\u5217\u7684\u6bcf\u500b\u5143\u7d20\u57f7\u884c\u67d0\u500b\u51fd\u6578\u5f8c\u56de\u50b3\u9663\u5217\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.map(function callback( currentValue[, index[, array]]) {<br>\/\/ return element for new_array<br>}[, thisArg])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">let numbers = [1, 4, 9]\nlet roots = numbers.map(function(num) {\n    return Math.sqrt(num)\n})\n\/\/ roots is now     [1, 2, 3]\n\/\/ numbers is still [1, 4, 9]<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"32_%E7%94%A8%E6%9F%90%E5%87%BD%E6%95%B8%E9%81%8E%E6%BF%BE%E9%99%A3%E5%88%97\"><\/span>3.2 \u7528\u67d0\u51fd\u6578\u904e\u6ffe\u9663\u5217<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"321_arrfilter\"><\/span>3.2.1 arr.filter()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p><strong><strong><span style=\"color:#ff0000\" class=\"has-inline-color\">\u6b64\u65b9\u6cd5\u4e0d\u6703\u6539\u8b8a\u539f\u4f86\u9663\u5217\u7684\u503c\uff01<\/span><\/strong><\/strong><\/p>\n\n\n\n<p>\u5c0d\u6bcf\u500b\u9663\u5217\u5143\u7d20\u57f7\u884c\u67d0\u500b\u51fd\u6578\uff0c\u56de\u50b3\u7b26\u5408\u51fd\u6578\u689d\u4ef6\u7684\u9663\u5217\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.filter(callback(element[, index, [array]])[, thisArg])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];\n\nconst result = words.filter(word => word.length > 6);\n\nconsole.log(result);\n\/\/ expected output: Array [\"exuberant\", \"destruction\", \"present\"]\n\nconsole.log(words);\n\/\/ expected output: Array ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"33_%E5%B0%8B%E6%89%BE%E9%99%A3%E5%88%97%E4%B8%AD%E6%98%AF%E5%90%A6%E5%8C%85%E5%90%AB%E6%9F%90%E5%85%83%E7%B4%A0\"><\/span>3.3 \u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u5305\u542b\u67d0\u5143\u7d20<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"331_arrindexOf\"><\/span>3.3.1 arr.indexOf()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u67d0\u500b\u5143\u7d20\uff0c\u6709\u7684\u8a71\u56de\u50b3\u627e\u5230\u8a72\u5143\u7d20\u7684\u7b2c1\u500bindex\u503c\uff0c\u6c92\u6709\u7684\u8a71\u56de\u50b3-1\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.indexOf(searchElement[, fromIndex])<\/span><\/p><\/blockquote>\n\n\n\n<p>searchElement\u70ba\u8981\u5c0b\u627e\u7684\u9663\u5217\u5143\u7d20\uff0cfromIndex\u70ba\u5f9e\u9663\u5217\u4e2d\u7684\u54ea\u500bindex\u958b\u59cb\u5c0b\u627e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const beasts = ['ant', 'bison', 'camel', 'duck', 'bison'];\n\nconsole.log(beasts.indexOf('bison'));\n\/\/ expected output: 1\n\n\/\/ start from index 2\nconsole.log(beasts.indexOf('bison', 2));\n\/\/ expected output: 4\n\nconsole.log(beasts.indexOf('giraffe'));\n\/\/ expected output: -1<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"332_arrlastIndexOf\"><\/span>3.3.2 arr.lastIndexOf()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u67d0\u500b\u5143\u7d20\uff0c\u6709\u7684\u8a71\u56de\u50b3\u627e\u5230\u8a72\u5143\u7d20\u7684\u6700\u5f8c1\u500bindex\u503c\uff0c\u6c92\u6709\u7684\u8a71\u56de\u50b3-1\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.lastIndexOf(searchElement[, fromIndex])<\/span><\/p><\/blockquote>\n\n\n\n<p>searchElement\u70ba\u8981\u5c0b\u627e\u7684\u9663\u5217\u5143\u7d20\uff0cfromIndex\u70ba\u5f9e\u9663\u5217\u4e2d\u7684\u54ea\u500bindex\u958b\u59cb\u5c0b\u627e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const animals = ['Dodo', 'Tiger', 'Penguin', 'Dodo'];\n\nconsole.log(animals.lastIndexOf('Dodo'));\n\/\/ expected output: 3\n\nconsole.log(animals.lastIndexOf('Tiger'));\n\/\/ expected output: 1<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"333_arrincludes\"><\/span>3.3.3 arr.includes()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u67d0\u500b\u5143\u7d20\uff0c\u6709\u7684\u8a71\u56de\u50b3true\uff0c\u6c92\u6709\u7684\u8a71\u56de\u50b3false\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.includes(valueToFind[, fromIndex])<\/span><\/p><\/blockquote>\n\n\n\n<p>valueToFind\u70ba\u8981\u5c0b\u627e\u7684\u9663\u5217\u5143\u7d20\uff0cfromIndex\u70ba\u5f9e\u9663\u5217\u4e2d\u7684\u54ea\u500bindex\u958b\u59cb\u5c0b\u627e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const array1 = [1, 2, 3];\n\nconsole.log(array1.includes(2));\n\/\/ expected output: true\n\nconst pets = ['cat', 'dog', 'bat'];\n\nconsole.log(pets.includes('cat'));\n\/\/ expected output: true\n\nconsole.log(pets.includes('at'));\n\/\/ expected output: false<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"34_%E5%B0%8B%E6%89%BE%E9%99%A3%E5%88%97%E4%B8%AD%E6%98%AF%E5%90%A6%E6%9C%89%E7%AC%A6%E5%90%88%E6%9F%90%E5%87%BD%E6%95%B8%E6%A2%9D%E4%BB%B6%E7%9A%84%E5%85%83%E7%B4%A0\"><\/span>3.4 \u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\u7684\u5143\u7d20<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"341_arrfindIndex\"><\/span>3.4.1 arr.findIndex()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\u7684\u5143\u7d20\uff0c\u6709\u7684\u8a71\u56de\u50b3\u7b2c1\u500b\u7b26\u5408\u8a72\u51fd\u6578\u689d\u4ef6\u5143\u7d20\u7684index\u503c\uff0c\u6c92\u6709\u7684\u8a71\u56de\u50b3-1\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.findIndex(callback( element[, index[, array]] )[, thisArg])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const array1 = [5, 12, 8, 130, 44];\n\nconst isLargeNumber = (element) => element > 13;\n\nconsole.log(array1.findIndex(isLargeNumber));\n\/\/ expected output: 3\n<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"342_arrfind\"><\/span>3.4.2 arr.find()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5c0b\u627e\u9663\u5217\u4e2d\u662f\u5426\u6709\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\u7684\u5143\u7d20\uff0c\u6709\u7684\u8a71\u56de\u50b3\u7b2c1\u500b\u7b26\u5408\u8a72\u51fd\u6578\u689d\u4ef6\u5143\u7d20\u7684\u503c\uff0c\u6c92\u6709\u7684\u8a71\u56de\u50b3undefined\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.find(callback(element[, index[, array]])[, thisArg])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const array1 = [5, 12, 8, 130, 44];\n\nconst found = array1.find(element => element > 10);\nconst found1 = array1.find(element => element &lt; 5);\n\nconsole.log(found);\n\/\/ expected output: 12\nconsole.log(found1);\n\/\/ expected output: undefined<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"35_%E6%AF%94%E5%B0%8D%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0%E6%98%AF%E5%90%A6%E7%AC%A6%E5%90%88%E6%9F%90%E5%87%BD%E6%95%B8%E6%A2%9D%E4%BB%B6\"><\/span>3.5 \u6bd4\u5c0d\u9663\u5217\u4e2d\u7684\u5143\u7d20\u662f\u5426\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"351_arrevery\"><\/span>3.5.1 arr.every()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6bd4\u5c0d\u9663\u5217\u4e2d\u7684\u6240\u6709\u5143\u7d20\u662f\u5426\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\uff0c\u5982\u679c\u6240\u6709\u5143\u7d20\u7686\u7b26\u5408\uff0c\u56de\u50b3true\uff0c\u5426\u5247\uff0c\u56de\u50b3false\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.every(callback(element[, index[, array]])[, thisArg])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">function isBigEnough(element, index, array) {\n  return element >= 10;\n}\n[12, 5, 8, 130, 44].every(isBigEnough);   \/\/ false\n[12, 54, 18, 130, 44].every(isBigEnough); \/\/ true<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"352_arrsome\"><\/span>3.5.2 arr.some()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6bd4\u5c0d\u9663\u5217\u4e2d\u7684\u5143\u7d20\u662f\u5426\u7b26\u5408\u67d0\u51fd\u6578\u689d\u4ef6\uff0c\u5982\u679c\u6709\u4efb\u4e00\u5143\u7d20\u7b26\u5408\uff0c\u56de\u50b3true\uff0c\u5426\u5247\uff0c\u56de\u50b3false\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.some(callback(element[, index[, array]])[, thisArg])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">function isBiggerThan10(element, index, array) {\n  return element > 10;\n}\n\n[2, 5, 8, 1, 4].some(isBiggerThan10);  \/\/ false\n[12, 5, 8, 1, 4].some(isBiggerThan10); \/\/ true<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"36_%E6%8E%92%E5%88%97%E9%99%A3%E5%88%97%E5%85%83%E7%B4%A0\"><\/span>3.6 \u6392\u5217\u9663\u5217\u5143\u7d20<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"361_arrreverse\"><\/span>3.6.1 arr.reverse()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5c07\u9663\u5217\u5143\u7d20\u53cd\u8f49\uff0c\u5f9e\u5c3e\u6392\u5230\u982d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const array1 = ['one', 'two', 'three'];\nconsole.log('array1:', array1);\n\/\/ expected output: \"array1:\" Array [\"one\", \"two\", \"three\"]\n\nconst reversed = array1.reverse();\nconsole.log('reversed:', reversed);\n\/\/ expected output: \"reversed:\" Array [\"three\", \"two\", \"one\"]\n\n\/\/ Careful: reverse is destructive -- it changes the original array.\nconsole.log('array1:', array1);\n\/\/ expected output: \"array1:\" Array [\"three\", \"two\", \"one\"]<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"362_arrsort\"><\/span>3.6.2 arr.sort()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6309\u7167compareFunction\u91cd\u65b0\u6392\u5217\u9663\u5217\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.sort([compareFunction])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">let arr = [5, 6, 3, 2, 9];\narr.sort(function(a,b) {\n    return a-b\n})\nconsole.log(arr)\n\/\/ [2, 3, 5, 6, 9]\n\narr.sort(function(a, b) {\n    return b-a\n})\nconsole.log(arr)\n\/\/ [9, 6, 5, 3, 2]<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u6c92\u6709compareFunction\uff0c\u5247\u6703\u5c07\u5143\u7d20\u8f49\u63db\u70ba\u5b57\u4e32\uff0c\u4e26\u6839\u64da\u5b57\u4e32\u7684unicode\u7de8\u78bc\u4f4d\u7f6e\u4f5c\u6392\u5e8f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">const months = ['March', 'Jan', 'Feb', 'Dec'];\nmonths.sort();\nconsole.log(months);\n\/\/ expected output: Array [\"Dec\", \"Feb\", \"Jan\", \"March\"]\n\nconst array1 = [1, 30, 4, 21, 100000];\narray1.sort();\nconsole.log(array1);\n\/\/ expected output: Array [1, 100000, 21, 30, 4]<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"37_%E5%B0%87%E9%99%A3%E5%88%97%E4%B8%AD%E7%9A%84%E5%85%83%E7%B4%A0%E5%B1%A4%E5%B1%A4%E5%9F%B7%E8%A1%8C%E6%9F%90%E5%87%BD%E6%95%B8\"><\/span>3.7 \u5c07\u9663\u5217\u4e2d\u7684\u5143\u7d20\u5c64\u5c64\u57f7\u884c\u67d0\u51fd\u6578<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"371_arrreduce\"><\/span>3.7.1 arr.reduce()<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u53ef\u4ee5\u7d2f\u7a4d\u5c0d\u9663\u5217\u4e2d\u7684\u5143\u7d20\u57f7\u884c\u67d0\u500b\u51fd\u6578\uff0c\u6709\u9ede\u985e\u4f3c+=\u6216*=\u7684\u6982\u5ff5\u3002<\/p>\n\n\n\n<p>\u8a9e\u6cd5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><span style=\"background-color: #eeeeee;\" data=\"#eeeeee\" class=\"qubely-text-has-bgcolor\">arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])<\/span><\/p><\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript line-numbers\">let sum = [0, 1, 2, 3].reduce(function (accumulator, currentValue) {\n  return accumulator + currentValue\n}, 0)\n\/\/ sum is 6<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u9663\u5217(array)\u5c6c\u65bc\u7269\u4ef6(object)\u7684\u4e00\u7a2e\uff0c\u5728Javacript\u4e2d\u6709\u8a31\u591a\u9663\u5217\u65b9\u6cd5(array methods)\u53ef\u505a\u8f49\u63db\u6216\u904b\u7b97\uff0c\u4f86\u6574\u7406\u4e00\u4e0b\u5728MDN\u770b\u5230\u9663\u5217\u5e38\u898b\u548c\u76f8\u95dc\u7684\u65b9\u6cd5\u3002 1. Array and String\uff1a\u9663\u5217\u8207\u5b57\u4e32\u7684\u8f49\u63db \u5b57\u4e32\u8207\u9663\u5217\u76f8\u95dc\u7684\u65b9\u6cd5 1.1 \u5b57\u4e32\u8f49\u63db\u6210\u9663\u5217 1.1.1 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/jimmyswebnote.com\/array-methods-list\/\"> <span class=\"screen-reader-text\">\u3010JavaScript\u57fa\u790e\u3011\uff1aArray Methods \u2014 \u9663\u5217\u65b9\u6cd5\u6574\u7406<\/span> Read More \u00bb<\/a><\/p>\n","protected":false},"author":1,"featured_media":1158,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[66,19],"tags":[68,67,69],"_links":{"self":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/1133"}],"collection":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/comments?post=1133"}],"version-history":[{"count":1,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/1133\/revisions"}],"predecessor-version":[{"id":2582,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/1133\/revisions\/2582"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/media\/1158"}],"wp:attachment":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/media?parent=1133"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/categories?post=1133"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/tags?post=1133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}