js 判断页面加载状态

  //----判断当前页面是否加载状态 开始 ----
document.onreadystatechange = subSomething;//当页面加载状态改变的时候执行这个方法.
function subSomething() {
if (document.readyState != 'complete') //当页面加载状态
{
//----显示遮罩 开始----
$(".overlay").css({ 'display': 'block', 'opacity': '0.8' });
$(".showbox").stop(true).animate({ 'margin-top': '300px', 'opacity': '1' }, 200);
//----显示遮罩 结束----
}
}
//----判断当前页面是否加载状态 结束 ----

页面加载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

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