js判断是否安装flash

    <script type="text/javascript">
        (function () {
            var noFlash = "你的浏览器没有安装Flash，会影响视频查看和上传图片...";
            var isIE = !-[1, ];
            if (isIE) {
                try {
                    var swf1 = new ActiveXObject(‘ShockwaveFlash.ShockwaveFlash‘);
                    //alert(‘安装了Flash‘);
                }
                catch (e) {
                    alert(noFlash);
                }
            }
            else {
                try {
                    var swf2 = navigator.plugins[‘Shockwave Flash‘];
                    if (swf2 == undefined) {
                        alert(noFlash);
                    }
                    else {
                        //alert(‘安装了Flash‘);
                    }
                }
                catch (e) {
                    alert(noFlash);
                }
            }
        })();
    </script>