如何判断js文件是否加载完成

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http://www.jquerycn.cn/a_11412

http://www.jizhuomi.com/software/535.html

 

function include_js(file) {
      var _doc = document.getElementsByTagName('head')[0];
      var js = document.createElement('script');
      js.setAttribute('type', 'text/javascript');
      js.setAttribute('src', file);
      _doc.appendChild(js);
      if (document.all) { //如果是IE
            js.onreadystatechange = function () {
                    if (js.readyState == 'loaded' || js.readyState == 'complete') {
                      alert('IE6、IE7 support js.onreadystatechange');
                  }
           }
      }
      else {
             js.onload = function () {
                       alert('Firefox、chrome and others support js.onload');
              }
       }
}

include_js('jquery.js');

 

面加载readyState的五种状态 
原文如下: 
0: (Uninitialized) the send( ) method has not yet been invoked. 
1: (Loading) the send( ) method has been invoked, request in progress. 
2: (Loaded) the send( ) method has completed, entire response received. 
3: (Interactive) the response is being parsed. 
4: (Completed) the response has been parsed, is ready for harvesting.

 

翻译成中文为: 
0 － （未初始化）还没有调用send()方法 
1 － （载入）已调用send()方法，正在发送请求 
2 － （载入完成）send()方法执行完成，已经接收到全部响应内容 
3 － （交互）正在解析响应内容 
4 － （完成）响应内容解析完成，可以在客户端调用了