代码1，
复制代码 代码示例:
<script language="
javascript" type="text/javascript">
if ((navigator.userAgent.indexOf('MSIE') >= 0) && (navigator.userAgent.indexOf('Opera') < 0)){alert('IE')}else
if (navigator.userAgent.indexOf('Firefox') >= 0){alert('Firefox')}else
if (navigator.userAgent.indexOf('Opera') >= 0){alert('Opera')}else
{alert('其它浏览器')}
</script>
代码2，
复制代码 代码示例:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS检查是什么浏览器_www.jb200.com</title>
<script language="JavaScript" type="text/javascript">
function checkFirefoxOrIE(){
userAgent=window.navigator.userAgent.toLowerCase();
if(userAgent.indexOf("firefox")>=1){
Findex=userAgent.indexOf("firefox/");
versionName=userAgent.substr(Findex+"Firefox/".length,3);
document.write("你用的是火狐浏览器！版本是：Firefox/"+versionName+"<br>");
}
else {
var name=navigator.appName;
if(name=="Microsoft Internet Explorer"){document.write("你用的是IE浏览器！");}
}
}
</script>
</head>
<body onload="checkFirefoxOrIE();">
</body>
</html>
