js判断浏览器版本

 function ExisitBrower() {
        var BR = "";
        var Sys = {};
        var ua = navigator.userAgent.toLowerCase();
        var s;
        (s = ua.match(/msie ([d.]+)/)) ? Sys.ie = s[1] :
        (s = ua.match(/firefox/([d.]+)/)) ? Sys.firefox = s[1] :
        (s = ua.match(/chrome/([d.]+)/)) ? Sys.chrome = s[1] :
        (s = ua.match(/opera.([d.]+)/)) ? Sys.opera = s[1] :
        (s = ua.match(/version/([d.]+).*safari/)) ? Sys.safari = s[1] : 0;

        //以下进行测试
        if (Sys.ie) {
            BR = "IE";
        } else if (Sys.firefox) {
            BR = "FF";
        } else if (Sys.chrome) {
            BR = "CH";
            // document.write('Chrome: ' + Sys.chrome);
        }
        else if (Sys.opera) {
            BR = "OP";
            // document.write('Opera: ' + Sys.opera);
        }
        else if (Sys.safari) {
            BR = "SA";
            //  document.write('Safari: ' + Sys.safari);
        }
        return BR;
    }

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