Window closed 属性

实例

检测新窗口"myWindow" 是否已被关闭：

 function checkWin()
 {
 if (!myWindow)
   {
   document.getElementById("msg").innerHTML="'myWindow' has never been opened!";
   }
   else
   {
   if (myWindow.closed)
     { 
     document.getElementById("msg").innerHTML="'myWindow' has been closed!";
     }
   else
     {
     document.getElementById("msg").innerHTML="'myWindow' has not been closed!";
     }
   } 
 }