网页判断浏览器是否安装flash

<script>

//检验flash版本 以及falsh是否安装

    function detectFlash() {

        try {

            if(navigator.mimeTypes.length>0) {

                var flashAct = navigator.mimeTypes["application/x-shockwave-flash"];

                var desc = flashAct.enabledPlugin.description;

                var version = parseInt(desc.substr(desc.toLowerCase().lastIndexOf("flash ") + 6));

                return version > 10;

            } else {

                var act = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');

                var flashVersion = act.GetVariable("$version");

                flashVersion = flashVersion.replace(/^.*?([0-9]+).*$/, '$1');

                return flashVersion > 10;

            }

        } catch (oError) {

            return false;

        }

        return false;

    }

	alert(detectFlash())

</script>