用document.onreadystatechange的方法來監聽狀態改變，
然後用document.readyState == “complete”判斷是否加載完成
代碼如下：
document.onreadystatechange = subSomething;//當頁面載入狀態改變的時候執行這個方法.
function subSomething()
{
if(document.readyState == “complete”) //當頁面載入狀態
myform.submit(); //表單提交
}
頁面載入readyState的五種狀態 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 responseed being preceived. 4: (Completed) the response has been parsed, is ready for harvesting.
翻譯成中文為
: 0 － （未初始化）還沒有呼叫send()方法
1 － （載入完成）send()方法，正在傳送請求
2 － （載入完成）send()方法執行完成，已經接收到全部回應內容
3 － （互動）正在解析回應內容
4 － （完成）回應內容解析完成，可以在客戶端呼叫了
