怎么让onbeforeunload后,不执行onunload

我的意思就是当我点击关闭或刷新的时候,在onbeforeunload中作一个confirm
用户点ok的时候才onunload(关闭或刷新)?
---------------------------------------------------------------

 1<script language="javascript">   
 2function window.onbeforeunload()   
 3{   
 4if (event.clientX>document.body.clientWidth && event.clientY<0 ¦ &brvbarevent.altKey)   
 5{   
 6var myWin = window.open('http://www.csdn.net')   
 7//window.event.returnValue=""; 页面提示   
 8}   
 9  
10}   
11</script>

试试

:_)

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