HTML DOM closed 屬性
定義和用法
closed 屬性可返回一個布爾值，該值聲明了窗口是否已經關閉。該屬性為只讀。
當瀏覽器窗口關閉時，表示該窗口的 Windows 對象并不會消失，它將繼續(xù)存在，不過它的 closed 屬性將設置為 true。
語法
window.closed
實例
下面的例子可檢測新窗口是否已被關閉：
<html>
<head>
<script type="text/javascript">
function ifClosed()
{
document.write("'myWindow' has been closed!")
}
function ifNotClosed()
{
document.write("'myWindow' has not been closed!")
}
function checkWin()
{
if (myWindow.closed)
ifClosed()
else
ifNotClosed()
}
</script>
</head>
<body>
<script type="text/javascript">
myWindow=window.open('','','width=200,height=100')
myWindow.document.write("This is 'myWindow'")
</script>
<input type="button" value="Has 'myWindow' been closed?"
onclick="checkWin()">
</body>
</html>