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>