五大浏览器js 判断IE、Firefox、Safari、Chrome、Opera
<html>
<head>
<script type="text/javascript">
function GetBrowserVersion()
{
var Sys = {};
var ua = navigator.userAgent.toLowerCase();
window.ActiveXObject ? Sys.ie = ua.match(/msie ([\d.]+)/)[1] :
document.getBoxObjectFor ? Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1] :
window.MessageEvent && !document.getBoxObjectFor ? Sys.chrome = ua.match(/chrome\/([\d.]+)/)[1] :
window.opera ? Sys.opera = ua.match(/opera.([\d.]+)/)[1] :
window.openDatabase ? Sys.safari = ua.match(/version\/([\d.]+)/)[1] : 0;
if(Sys.ie) return('IE: '+Sys.ie);
if(Sys.firefox)return('FF:'+Sys.firefox);
if(Sys.chrome) return('CH:'+Sys.chrome);
if(Sys.opera) return('OP:'+Sys.opera);
if(Sys.safari) return('SA:'+Sys.safari);
}
alert(GetBrowserVersion());
</script>
</head>
<body>
aa
</body>
</html>
