HTML DOM closed 属性
- 定义和用法
  - 语法
- 实例

HTML DOM closed 属性

定义和用法

closed 属性可返回一个布尔值，该值声明了窗口是否已经关闭。该属性为只读。

当浏览器窗口关闭时，表示该窗口的 Windows 对象并不会消失，它将继续存在，不过它的 closed 属性将设置为 true。

语法

window.closed

实例

下面的例子可检测新窗口是否已被关闭：

<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>