web前端|js教程
javascript,回调函数,异步载入
web前端-js教程
本文实例讲述了javascript带回调函数的异步脚本载入方法。分享给大家供大家参考。具体实现方法如下：
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var Loader = function () { }Loader.prototype = { require: function (scripts, callback) { this.loadCount = 0; this.totalRequired = scripts.length; this.callback = callback; for (var i = 0; i < scripts.length; i++) {this.writeScript(scripts[i]); } }, loaded: function (evt) { this.loadCount++; if (this.loadCount == this.totalRequired && typeof this.callback == function) this.callback.call(); }, writeScript: function (src) { var self = this; var s = document.createElement(script); s.type = "text/javascript"; s.async = true; s.src = src; s.addEventListener(load, function (e) { self.loaded(e); }, false); var head = document.getElementsByTagName(head)[0]; head.appendChild(s); }}
用法演示
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var l = new Loader();l.require([ "example-script-1.js", "example-script-2.js"], function() { // Callback console.log(All Scripts Loaded); });
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