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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);
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