用js判断页面是否加载完成实现代码

用document.onreadystatechange的方法来监听状态改变，
然后用document.readyState == “complete”判断是否加载完成
代码如下：

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 
myform.submit(); //表单提交 
} 

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