检测是否安装了FLASH插件

    <script type="text/javascript">
            //自己总结的
            //IE中判断是否安装插件
            var swf;
            function IE_Flash()
            {
            try
            {
            var swf=new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
            alert("已安装插件");
            }
            catch(e)
            {
            alert("没有安装插件");
            }
            }
            FF_or_Chrome_Flash();
            //FireFox,Chrome中判断是否安装插件
            function FF_or_Chrome_Flash()
            {
            var swf=navigator.plugins["Shockwave Flash"];
            (swf)?alert("已安装插件"):alert("没有安装插件");
            }
            </script>