如何检测用户是否正在运行IE 6？
问题描述：
我需要能够判断是否在IE 6中查看某个页面。如何在javascript中执行此操作而忽略7,8或其他浏览器等版本？
I need to be able to tell if a page is being viewed in IE 6. How can I do this in javascript while ignoring version like 7, 8, or other browsers?
答
直接来自马的嘴（和一个谷歌搜索）：
straight from the horse's mouth (and one googling away):
function getInternetExplorerVersion()
// Returns the version of Internet Explorer or a -1
// (indicating the use of another browser).
{
var rv = -1; // Return value assumes failure.
if (navigator.appName == 'Microsoft Internet Explorer')
{
var ua = navigator.userAgent;
var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
if (re.exec(ua) != null)
rv = parseFloat( RegExp.$1 );
}
return rv;
}