js 判断是否安装qq msn等

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http://lcx.cc/?i=3065

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <title> New Document </title>
  <meta name="Generator" content="EditPlus">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <script type="text/javascript">
  <!--
   checkInstalled = function(m) {  
  switch(m){
  case 'msn':  
   try {  
    new ActiveXObject("MSNMessenger.P4QuickLaunch");  
    return true;  
   }  
   catch (e) {  
    return false;  
   }  
  case 'qq':  
   try {  
    new ActiveXObject("TimwpDll.TimwpCheck");  
    return true;  
   }  
   catch (e) {  
    return false;  
   }
  case 'skype':  
   try{  
    new ActiveXObject("Skype.Detection");  
    return true;  
   }catch(e){  
    return false;  
   } 

  }  
   } 

  //-->
  </script>
 </head>

 <body>
  <input type="button" value="检测有没有安装MSN" onclick="alert(checkInstalled('msn'))" />
  <input type="button" value="检测有没有安装QQ" onclick="alert(checkInstalled('qq'))" />
  <input type="button" value="检测有没有安装SKYPE" onclick="alert(checkInstalled('skype'))" />  
 </body>
</html>

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