JavaScript用全域變數封裝模組

下面的代碼是我的測試代碼，注釋很重要：

[plain]
/* 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.說明，參考了一篇文章和stackoverflow上的一個文章
2.(function(){})() 這種代碼寫在獨立的js檔案裡，當js檔案被html載入的時候，該函數就會執行。實際上建立了windows.text對象。

以後html代碼就可用test.init的形式調用方法。

測試html部分代碼如下：

[plain] 
<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會報兩個問題，一是關於undefined的，沒找到什麼好方法，任它抱怨吧。另一格式最後調用方式要改成：

[javascript] 
}(window, document)); 
無所謂了，就任由它吧。只要功能正常就行。