如何监测浏览器关闭事件


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<HTML><!-- #BeginTemplate "/Templates/JsExample.dwt" --><HEAD>
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<TITLE>离开启动收藏夹 </TITLE>
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<META http-equiv=Content-Type content="text/html; charset=gb2312"><LINK  href="../fav.ico" rel="shortcut icon">
<STYLE type=text/css>BODY {
MARGIN: 25px 25px 25px
}
#all TD {
FONT-SIZE: 12px; LINE-HEIGHT: 15px; FONT-FAMILY: "Verdana", "Arial","新宋体", "宋体"
}
INPUT {
FONT-SIZE: 12px; LINE-HEIGHT: 15px; FONT-FAMILY: "Verdana", "Arial","新宋体", "宋体"
}
SELECT {
FONT-SIZE: 12px; LINE-HEIGHT: 15px; FONT-FAMILY: "Verdana", "Arial","新宋体", "宋体"
}
P {
FONT-SIZE: 12px; LINE-HEIGHT: 15px; FONT-FAMILY: "Verdana", "Arial","新宋体", "宋体"
}
TEXTAREA {
FONT-SIZE: 12px; LINE-HEIGHT: 15px; FONT-FAMILY: "Verdana", "Arial","新宋体", "宋体"
}#all A:active {
COLOR: #7d070c
}
#all A:visited {
COLOR: #7d070c
}#all A:hover {
COLOR: #336699
}
#all A:link {
COLOR: #7d070c
}
</STYLE><SCRIPT language=JavaScript>
<!--
function MM_goToURL() { //v3.0
  var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}
function JM_cc(ob){
ob.select();js=ob.createTextRange();js.execCommand("Copy");
}
//-->
</SCRIPT><META content="MSHTML 5.50.4134.600" name=GENERATOR></HEAD>
<BODY id=all text=#000000 bgColor=#336699>
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TR bgColor=#ffffff> 
    <TD><IMG src="../images/sq_1.gif" width=11 height="14"></TD>
    <TD width="100%"></TD>
    <TD><IMG src="../images/sq_2.gif"    width=11 height="14"></TD>
  </TR>
</TABLE>
<!-- #BeginEditable "Example%20and%20Sources" --> 
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TR bgColor=#ffffff> 
    <TD><IMG src="../images/space.gif" width=11 height="1"></TD>
    <TD width="100%"> 
      <table width="100%" border="0" cellpadding="8">
        <tr> 
          <td align="center"><!-- #BeginLibraryItem "/Library/js_title.lbi" --><script language="JavaScript">
document.write("<font color=#7d070c style=\"font-size: 14px\">"+document.title+"</font>");
</script><!-- #EndLibraryItem --></td>
        </tr>
        <tr> 
          <td bgcolor="#f7f7f7">提示： 在你离开本页时就会自动启动收藏夹。 <br><script language="javascript">
function book(){
window.external.AddFavorite(location.href, document.title)
}
window.onunload=book
</script>
            <input type="button" name="Button" value="点这里离开本页面" onClick=window.close()>
          </td>
        </tr>
      </table>
      <br>
      1.将下面的代码放到&lt;body&gt;或&lt;head&gt;内 
      <input type="button" name="Button" value="复制代码到我的剪贴板" onClick=JM_cc(js_1)>
      <br>
      <textarea name="js_1" cols="80" rows="10"><script language="javascript">
function book(){
window.external.AddFavorite(location.href, document.title)
}
</script></textarea>
      <br>
      <br>
      2.在&lt;body&gt;中加上 onunload=book() <br>
      如:&lt;body bgcolor=#336699 <font color="#990000">onunload=book()</font>&gt;</TD>
    <TD><IMG src="../images/space.gif"    width=11 height="1"></TD>
  </TR>
</TABLE>
<!-- #EndEditable -->
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  <TR bgColor=#ffffff> 
    <TD><IMG src="../images/sq_3.gif" width=11 height="14"></TD>
    <TD width="100%"></TD>
    <TD><IMG src="../images/sq_4.gif"    width=11 height="14"></TD>
  </TR>
</TABLE></BODY><!-- #EndTemplate --></HTML>