javascript全局变量封装模块实现代码

下面的代码是我的测试代码，注释很重要：复制代码代码如下: /*global window,jQuery,validate_email,masterUI,$,rest*/ /** Enable ECMAScript "strict" operation for this function. See more: * http://ejohn.org/blog/ecmascript-5-strict-mode-json-and-more/ * http://stackoverflow.com/questions/5020479/what-advantages-does-using-functionwindow-document-undefined-windo * Q1: Why are window and document being fed instead of just being accessed normally? * A1: Generally to fasten the identifier resolution process, having them as local variables can help (although IMO the performance improvements may be negligible). * A2: Passing the global object is also a widely used technique on non-browser environments, where you don't have a window identifier at the global scope, e.g.: * (function (global) { * //.. * })(this); // this on the global execution context is the global object itself * A3: Passing window and document allows the script to be more efficiently minified * * Q2: Why the heck is undefined being passed in? * A1: This is made because the undefined global property in ECMAScript 3, is mutable, meaning that someone could change its value affecting your code, for example: * undefined = true; // mutable * (function (undefined) { * alert(typeof undefined); // "undefined", the local identifier * })(); // <-- no value passed, undefined by default * If you look carefully undefined is actually not being passed (there's no argument on the function call), * that's one of the reliable ways to get the undefined value, without using the property window.undefined. * */ (function(window, document, undefined) { "use strict"; window.test = { init: function () { "use strict"; alert("ok"); } }; })(window, document);// no undefined parameter here to avoid using mutable window.undefined changed by other guy 1.说明，参考了一篇文章和stackoverflow上的一个帖子 2.(function(){})() 这种代码写在独立的js文件里，当js文件被html加载的时候，该函数就会执行。实际上创建了windows.text对象。以后html代码就可用test.init的形式调用方法。测试html部分代码如下：复制代码代码如下: [plain] view plaincopyprint? <head> <title>AppEngine SDK</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script type="text/javascript" src="../../master/script/third_party/jquery-1.8.0.min.js"></script> <script type="text/javascript" src="../../master/plugin/jquery-validation-1.9.0/jquery.validate.js"></script> <script type="text/javascript" src="../../master/plugin/artDialog4.1.6/jquery.artDialog.js"></script> <script type="text/javascript" src="../../master/script/app/test.js"></script> <script type="text/javascript"> $(document).ready(function() { test.init(); }) </script> </head> 3.Jslint会报两个问题，一是关于undefined的，没找到什么好方法，任它抱怨吧。另一格式最后调用方式要改成：复制代码代码如下: [javascript] view plaincopyprint?}(window, document)); }(window, document)); 无所谓了，就任由它吧。只要功能正常就行。

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复制代码代码如下: /** * @description 事件绑定，兼容各浏览器 * @param target 事件触发对象 * @param type 事件 * @param func 事件处理函数 */ function addEvents(target, type, func) { if (target.addEven>>>详细阅读

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