JS检测浏览器版本

 

<script type="text/javascript"> 
        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) document.write('IE: ' + Sys.ie); 
        if (Sys.firefox) document.write('Firefox: ' + Sys.firefox); 
        if (Sys.chrome) document.write('Chrome: ' + Sys.chrome); 
        if (Sys.opera) document.write('Opera: ' + Sys.opera); 
        if (Sys.safari) document.write('Safari: ' + Sys.safari); 
</script>