{"id":168726,"date":"2024-05-08T16:30:15","date_gmt":"2024-05-08T08:30:15","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168726.html"},"modified":"2024-05-08T16:30:17","modified_gmt":"2024-05-08T08:30:17","slug":"javascript-%e5%be%aa%e7%8e%af%e6%b7%bb%e5%8a%a0%e4%ba%8b%e4%bb%b6%e6%97%b6%e9%97%ad%e5%8c%85%e7%9a%84%e5%bd%b1%e5%93%8d%e6%9c%89%e5%93%aa%e4%ba%9b%e8%a7%a3%e6%b3%95","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168726.html","title":{"rendered":"JavaScript \u5faa\u73af\u6dfb\u52a0\u4e8b\u4ef6\u65f6\u95ed\u5305\u7684\u5f71\u54cd\u6709\u54ea\u4e9b\u89e3\u6cd5"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27034949\/ff862213-e954-40aa-ab3b-5f39b9b5065c.webp\" alt=\"JavaScript \u5faa\u73af\u6dfb\u52a0\u4e8b\u4ef6\u65f6\u95ed\u5305\u7684\u5f71\u54cd\u6709\u54ea\u4e9b\u89e3\u6cd5\" \/><\/p>\n<p><p>\u95ed\u5305\u5728JavaScript\u4e2d\u5e38\u7528\u4e8e\u5728\u5faa\u73af\u4e2d\u521b\u5efa\u4e00\u4e2a\u79c1\u6709\u4f5c\u7528\u57df\u6765\u7ef4\u62a4\u6b63\u786e\u7684\u7d22\u5f15\u503c\uff0c<strong>\u89e3\u51b3\u65b9\u6848\u4e3b\u8981\u6709\u5229\u7528\u51fd\u6570\u4f5c\u7528\u57df\u3001let\u5173\u952e\u5b57\u4ee5\u53caforEach\u65b9\u6cd5<\/strong>\u3002\u5229\u7528\u51fd\u6570\u4f5c\u7528\u57df\u7684\u65b9\u5f0f\u662f\u901a\u8fc7\u7acb\u5373\u6267\u884c\u51fd\u6570\u8868\u8fbe\u5f0f\uff08IIFE\uff09\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u4f5c\u7528\u57df\uff0c\u5728\u8fd9\u4e2a\u4f5c\u7528\u57df\u4e2d\u80fd\u591f\u4fdd\u5b58\u5faa\u73af\u4e2d\u7684\u5f53\u524d\u7d22\u5f15\u503c\u3002\u4f5c\u4e3a\u4e00\u4e2a\u5c55\u5f00\u63cf\u8ff0\uff0cIIFE\u80fd\u591f\u4e3a\u6bcf\u6b21\u8fed\u4ee3\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u4f5c\u7528\u57df\uff0c\u91cc\u9762\u7684\u503c\u662f\u72ec\u7acb\u7684\uff0c\u8fd9\u6837\u6bcf\u4e2a\u4e8b\u4ef6\u5904\u7406\u5668\u90fd\u80fd\u591f\u8bbf\u95ee\u5230\u6b63\u786e\u7684\u7d22\u5f15\u503c\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528\u51fd\u6570\u4f5c\u7528\u57df<\/h3>\n<\/p>\n<p><p>\u6bcf\u6b21\u5faa\u73af\u65f6\uff0c\u901a\u8fc7 IIFE \u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\u4f5c\u7528\u57df\uff0c\u4f7f\u5f97\u4e8b\u4ef6\u7ed1\u5b9a\u7684\u51fd\u6570\u80fd\u591f\u6b63\u786e\u5730\u8bbf\u95ee\u5230\u5faa\u73af\u8fed\u4ee3\u53d8\u91cf\u3002\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">for (var i = 0; i &lt; buttons.length; i++) {<\/p>\n<p>  (function(index) {<\/p>\n<p>    buttons[index].addEventListener(&#039;click&#039;, function() {<\/p>\n<p>      console.log(&#039;Button &#039; + index + &#039; clicked&#039;);<\/p>\n<p>    });<\/p>\n<p>  })(i);<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6bcf\u6b21\u5faa\u73af\u8fed\u4ee3\u65f6\u7acb\u5373\u6267\u884c\u51fd\u6570\u5e26\u4e0a\u5f53\u524d\u7684\u7d22\u5f15 i\u3002\u8fd9\u4e2a\u7d22\u5f15\u503c\u88ab\u201c\u56fa\u5b9a\u201d\u5728\u4e8b\u4ef6\u76d1\u542c\u5668\u7684\u56de\u8c03\u51fd\u6570\u4e2d\uff0c\u56e0\u6b64\u6bcf\u6b21\u56de\u8c03\u51fd\u6570\u6267\u884c\u65f6\u90fd\u80fd\u591f\u83b7\u53d6\u5230\u6b63\u786e\u7684\u7d22\u5f15\u503c\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528let\u5173\u952e\u5b57<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528 ES6 \u5f15\u5165\u7684 <code>let<\/code> \u5173\u952e\u5b57\u53ef\u4ee5\u66f4\u4f18\u96c5\u5730\u89e3\u51b3\u95ed\u5305\u95ee\u9898\uff0c\u56e0\u4e3a <code>let<\/code> \u63d0\u4f9b\u4e86\u5757\u7ea7\u4f5c\u7528\u57df\u3002\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">for (let i = 0; i &lt; buttons.length; i++) {<\/p>\n<p>  buttons[i].addEventListener(&#039;click&#039;, function() {<\/p>\n<p>    console.log(&#039;Button &#039; + i + &#039; clicked&#039;);<\/p>\n<p>  });<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u91cc\uff0c<code>let<\/code> \u4e3a\u6bcf\u4e2a\u8fed\u4ee3\u5faa\u73af\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u7ed1\u5b9a\uff0c<em><strong>\u610f\u5473\u7740\u6bcf\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\u4e2d\u7684 i \u5b9e\u9645\u4e0a\u662f\u5bf9\u5e94\u5faa\u73af\u8fed\u4ee3\u4e2d\u7684\u526f\u672c<\/strong><\/em>\u3002\u56e0\u6b64\uff0c\u65e0\u9700\u4f7f\u7528\u989d\u5916\u7684\u4f5c\u7528\u57df\u6216\u51fd\u6570\u6765\u4fdd\u7559\u53d8\u91cf\u503c\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u4f7f\u7528forEach\u65b9\u6cd5<\/h3>\n<\/p>\n<p><p>\u5bf9\u6570\u7ec4\u4f7f\u7528 <code>forEach<\/code> \u65b9\u6cd5\u5c06\u8fed\u4ee3\u6bcf\u4e2a\u5143\u7d20\uff0c\u540c\u65f6\u63d0\u4f9b\u5f53\u524d\u5143\u7d20\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u76f4\u63a5\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u4f7f\u7528\u3002\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">buttons.forEach(function(button, index) {<\/p>\n<p>  button.addEventListener(&#039;click&#039;, function() {<\/p>\n<p>    console.log(&#039;Button &#039; + index + &#039; clicked&#039;);<\/p>\n<p>  });<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><code>forEach<\/code> \u65b9\u6cd5\u7684\u56de\u8c03\u51fd\u6570\u5177\u6709\u5f53\u524d\u5143\u7d20\u7684\u7d22\u5f15\u503c\u53c2\u6570\uff0c\u8fd9\u4e3a\u6bcf\u4e2a\u6309\u94ae\u7ed1\u5b9a\u7684\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u63d0\u4f9b\u4e86\u6b63\u786e\u7684\u7d22\u5f15\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u4f7f\u7528\u4e8b\u4ef6\u59d4\u6258<\/h3>\n<\/p>\n<p><p>\u89c2\u5bdf\u6574\u4e2a\u95ee\u9898\u7684\u53e6\u4e00\u4e2a\u89d2\u5ea6\u662f\u4f7f\u7528\u4e8b\u4ef6\u59d4\u6258\uff0c\u5728\u7236\u5143\u7d20\u4e0a\u8bbe\u7f6e\u4e00\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u800c\u4e0d\u662f\u5728\u5faa\u73af\u4e2d\u4e3a\u6bcf\u4e2a\u5b50\u5143\u7d20\u5355\u72ec\u7ed1\u5b9a\u4e8b\u4ef6\u3002\u4e8b\u4ef6\u59d4\u6258\u7684\u597d\u5904\u662f\u51cf\u5c11\u4e86\u4e8b\u4ef6\u76d1\u542c\u5668\u7684\u6570\u91cf\uff0c\u800c\u4e14\u5bf9\u4e8e\u52a8\u6001\u6dfb\u52a0\u7684\u5b50\u5143\u7d20\u4e5f\u80fd\u591f\u9002\u7528\u3002\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">parentElement.addEventListener(&#039;click&#039;, function(event) {<\/p>\n<p>  var index = Array.prototype.indexOf.call(this.children, event.target);<\/p>\n<p>  if (index &gt; -1) {<\/p>\n<p>    console.log(&#039;Button &#039; + index + &#039; clicked&#039;);<\/p>\n<p>  }<\/p>\n<p>});<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u4f7f\u7528\u81ea\u5b9a\u4e49\u6570\u636e\u5c5e\u6027<\/h3>\n<\/p>\n<p><p>\u5c06\u6240\u9700\u7684\u6570\u636e\u5b58\u50a8\u5728HTML\u5143\u7d20\u7684\u81ea\u5b9a\u4e49\u6570\u636e\u5c5e\u6027\uff08data-*\uff09\u4e2d\u3002\u5f53\u9700\u8981\u64cd\u4f5c\u8fd9\u4e2a\u5143\u7d20\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u4ece\u8fd9\u4e2a\u5143\u7d20\u7684dataset\u5c5e\u6027\u4e2d\u83b7\u53d6\u5230\u76f8\u5e94\u7684\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-javascript\">for (var i = 0; i &lt; buttons.length; i++) {<\/p>\n<p>  buttons[i].dataset.index = i;<\/p>\n<p>  buttons[i].addEventListener(&#039;click&#039;, function() {<\/p>\n<p>    var index = this.dataset.index;<\/p>\n<p>    console.log(&#039;Button &#039; + index + &#039; clicked&#039;);<\/p>\n<p>  });<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u6bcf\u4e2a\u6309\u94ae\u901a\u8fc7\u81ea\u5b9a\u4e49\u7684 <code>data-index<\/code> \u5c5e\u6027\u4fdd\u5b58\u4e86\u7d22\u5f15\u4fe1\u606f\uff0c\u5728\u4e8b\u4ef6\u89e6\u53d1\u65f6\u53ef\u4ee5\u901a\u8fc7 <code>this.dataset.index<\/code> \u6765\u83b7\u53d6\u8be5\u503c\u3002<\/p>\n<\/p>\n<p><p>\u7efc\u4e0a\u6240\u8ff0\uff0c\u95ed\u5305\u5728\u5faa\u73af\u4e2d\u6dfb\u52a0\u4e8b\u4ef6\u5904\u7406\u5668\u65f6\u53ef\u80fd\u5bfc\u81f4\u5f15\u7528\u540c\u4e00\u53d8\u91cf\uff0c\u4ea7\u751f\u610f\u6599\u4e4b\u5916\u7684\u7ed3\u679c\u3002\u901a\u8fc7 IIFE\u3001let \u5173\u952e\u5b57\u3001forEach \u65b9\u6cd5\u3001\u4e8b\u4ef6\u59d4\u6258\u6216\u81ea\u5b9a\u4e49\u6570\u636e\u5c5e\u6027\u7b49\u6280\u672f\u624b\u6bb5\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\uff0c\u786e\u4fdd\u4e8b\u4ef6\u5904\u7406\u5668\u80fd\u591f\u6b63\u786e\u5730\u5f15\u7528\u5230\u9884\u671f\u7684\u53d8\u91cf\u503c\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>Q1: \u4e3a\u4ec0\u4e48\u5728 JavaScript \u5faa\u73af\u4e2d\u6dfb\u52a0\u4e8b\u4ef6\u4f1a\u53d7\u5230\u95ed\u5305\u7684\u5f71\u54cd\uff1f<\/strong><br \/>\n\u5f53\u5728\u5faa\u73af\u4e2d\u521b\u5efa\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u65f6\uff0c\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u5c06\u7ed1\u5b9a\u5230\u4e86\u5916\u90e8\u95ed\u5305\u4e2d\u7684\u53d8\u91cf\uff0c\u800c\u4e0d\u662f\u7ed1\u5b9a\u5230\u6bcf\u4e2a\u8fed\u4ee3\u4e2d\u7684\u5177\u4f53\u53d8\u91cf\u3002\u8fd9\u5bfc\u81f4\u4e86\u5728\u89e6\u53d1\u4e8b\u4ef6\u65f6\uff0c\u53ea\u4f1a\u4f7f\u7528\u5faa\u73af\u7ed3\u675f\u65f6\u7684\u53d8\u91cf\u503c\uff0c\u5e76\u4e14\u6240\u6709\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u90fd\u4f1a\u5171\u4eab\u76f8\u540c\u7684\u503c\u3002<\/p>\n<p><strong>Q2: \u95ed\u5305\u5728 JavaScript \u5faa\u73af\u4e2d\u6dfb\u52a0\u4e8b\u4ef6\u65f6\u4f1a\u4ea7\u751f\u4ec0\u4e48\u6837\u7684\u95ee\u9898\uff1f<\/strong><br \/>\n\u95ed\u5305\u4f1a\u5bfc\u81f4\u5faa\u73af\u4e2d\u7684\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u65e0\u6cd5\u6b63\u786e\u8bbf\u95ee\u8fed\u4ee3\u4e2d\u7684\u53d8\u91cf\u503c\u3002\u65e0\u8bba\u5faa\u73af\u6267\u884c\u591a\u5c11\u6b21\uff0c\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u59cb\u7ec8\u4f7f\u7528\u6700\u540e\u4e00\u6b21\u8fed\u4ee3\u7684\u53d8\u91cf\u503c\uff0c\u5bfc\u81f4\u51fa\u73b0\u610f\u5916\u7684\u7ed3\u679c\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4bug\u3001\u903b\u8f91\u9519\u8bef\u6216\u610f\u5916\u7684\u884c\u4e3a\u3002<\/p>\n<p><strong>Q3: \u6709\u54ea\u4e9b\u89e3\u6cd5\u53ef\u4ee5\u89e3\u51b3 JavaScript \u5faa\u73af\u4e2d\u6dfb\u52a0\u4e8b\u4ef6\u65f6\u95ed\u5305\u7684\u5f71\u54cd\uff1f<\/strong><br \/>\n\u89e3\u51b3\u95ed\u5305\u95ee\u9898\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u7acb\u5373\u6267\u884c\u51fd\u6570\u3001\u4f7f\u7528let\u5173\u952e\u5b57\u3001\u4f7f\u7528bind\u65b9\u6cd5\u6216\u7bad\u5934\u51fd\u6570\u3002\u8fd9\u6837\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u53d8\u91cf\u4f5c\u7528\u57df\uff0c\u786e\u4fdd\u6bcf\u4e2a\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u90fd\u53ef\u4ee5\u8bbf\u95ee\u5230\u6b63\u786e\u7684\u8fed\u4ee3\u53d8\u91cf\u503c\u3002\u53e6\u5916\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e8b\u4ef6\u4ee3\u7406\u7684\u65b9\u5f0f\uff0c\u5728\u7236\u5143\u7d20\u4e0a\u6dfb\u52a0\u4e8b\u4ef6\uff0c\u901a\u8fc7\u4e8b\u4ef6\u5192\u6ce1\u6765\u5904\u7406\u5177\u4f53\u7684\u5b50\u5143\u7d20\u4e8b\u4ef6\uff0c\u4ece\u800c\u907f\u514d\u95ed\u5305\u95ee\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u95ed\u5305\u5728JavaScript\u4e2d\u5e38\u7528\u4e8e\u5728\u5faa\u73af\u4e2d\u521b\u5efa\u4e00\u4e2a\u79c1\u6709\u4f5c\u7528\u57df\u6765\u7ef4\u62a4\u6b63\u786e\u7684\u7d22\u5f15\u503c\uff0c\u89e3\u51b3\u65b9\u6848\u4e3b\u8981\u6709\u5229\u7528\u51fd\u6570\u4f5c\u7528\u57df\u3001 [&hellip;]","protected":false},"author":3,"featured_media":168729,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/168726"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=168726"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/168726\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/168729"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=168726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=168726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=168726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}