判断浏览器类型与是否安装了flash插件(兼容chrome,firefox,IE)

<html>
<head>
<SCRIPT type=text/javascript>
 window.onload=function(){
    var swf;     
    if(navigator.userAgent.indexOf("MSIE")>0) {
        try 
        { 
            var swf=new ActiveXObject("ShockwaveFlash.ShockwaveFlash"); 
            alert("已安装插件"); 
        } 
        catch(e) 
        { 
            alert("没有安装插件"); 
        } 
    }
    if(navigator.userAgent.indexOf("Firefox")>0 || navigator.userAgent.indexOf("Chrome")>0){
        swf=navigator.plugins["Shockwave Flash"]; 
        (swf)?alert("已安装插件"):alert("没有安装插件"); 
    }
 };
</script>
</SCRIPT>
<body>
</body>
</html>

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