检测IE版本号的方法总结

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;
}
function checkVersion()
{
var msg = "You're not using Internet Explorer.";
var ver = getInternetExplorerVersion();

if ( ver > -1 )
{
if ( ver >= 8.0 )
msg = "You're using a recent copy of Internet Explorer."
else
msg = "You should upgrade your copy of Internet Explorer.";
}
alert( msg );
}

engine = null;
if (window.navigator.appName == "Microsoft Internet Explorer")
{
// This is an IE browser. What mode is the engine in?
if (document.documentMode) // IE8
engine = document.documentMode;
else // IE 5-7
{
engine = 5; // Assume quirks mode unless proven otherwise
if (document.compatMode)
{
if (document.compatMode == "CSS1Compat")
engine = 7; // standards mode
}
}
// the engine variable now contains the document compatibility mode.
}

private float getInternetExplorerVersion()
{
// Returns the version of Internet Explorer or a -1
// (indicating the use of another browser).
float rv = -1;
System.Web.HttpBrowserCapabilities browser = Request.Browser;
if (browser.Browser == "IE")
rv = (float)(browser.MajorVersion + browser.MinorVersion);
return rv;
}

private void Page_Load(object sender, System.EventArgs e)
{
string msg;
double ver = getInternetExplorerVersion();
if (ver > 0.0)
{
if (ver >= 7.0)
msg = "You're using a recent version of Internet Explorer.";
else
msg = "You should upgrade your copy of Internet Explorer.";
}
else
msg = "You're not using Internet Explorer.";

Label1.Text = msg;
}

<!--[if gte IE 8]>
<p>You're using a recent version of Internet Explorer.</p>
<![endif]-->

<!--[if lt IE 7]>
<p>Hm. You should upgrade your copy of Internet Explorer.</p>
<![endif]-->

<![if !IE]>
<p>You're not using Internet Explorer.</p>
<![endif]>