JavaScript判断浏览器类型及版本

<script type=”text/javascript”>
        var Sys = {};
        var ua = navigator.userAgent.toLowerCase();
        if (window.ActiveXObject)
             Sys.ie = ua.match(/msie ([\d.]+)/)[1]
        else if (document.getBoxObjectFor)
             Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1]
        else if (window.MessageEvent && !document.getBoxObjectFor)
             Sys.chrome = ua.match(/chrome\/([\d.]+)/)[1]
        else if (window.opera)
             Sys.opera = ua.match(/opera.([\d.]+)/)[1]
        else if (window.openDatabase)
             Sys.safari = ua.match(/version\/([\d.]+)/)[1];
      
       //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>

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