做页面时经常会遇到当前页面加载完成后，执行某些初始化工作。这时候就要知道如何判断页面（包括IFRAME）已经加载完成，代码如下：
< script language = "javascript" >
document.onreadystatechange = statechange;
function statechange() {
if (document.readyState == 'complete') {
for (i = 0; i < window.frames[].length; i++) {
window.frames[i].document.onreadystatechange = statechange;
if (window.frames[i].document.readyState != 'complete') {
statechange();
alert("加载完毕！");
return;
}
}
}
}
< /script>
FROM：http://www.kqiqi.com/knowledge/program/717.html
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
< script language = "javascript" >
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
alert("加载完毕！"); //加载完毕
}
</script>
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
FROM: http://www.jb51.net/article/32569.htm
方法一
<body onload="alert();">
< script language = "javascript" >
//方法二
$(document).ready(function(){
alert("加载完毕！");//执行
})
//方法三
window.onload = function(){
//全部加载完成！！
}
</script>