收藏两个微软开发小组做的JS,相当精干。实现的功能，和实现的细节，相当舒服。
// ----------------------------------------------------------------------------------
// Microsoft Developer & Platform Evangelism
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
// EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
// ----------------------------------------------------------------------------------
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious. No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
// ----------------------------------------------------------------------------------
// Enumerators
var BUH_positionType = {
"Fixed" : 0,
"Absolute" : 1
};
// ---
// Settings
var BUH_showAllBrowsers = true;
var BUH_cookieName = 'IE8Detector';
var BUH_rememberUserSettings = false;
var BUH_position = BUH_positionType.Fixed;
var BUH_scriptPath = "script/";
// ---
// Default Text
var BUH_IE8_MessageTitle = "You may want to enhance your browser";
var BUH_IE8_MessageDownloadLink = "Make it yours";
var BUH_OldIE_MessageTitle = "Upgrade for free your browser";
var BUH_OldIE_MessageDownloadLink = "Download now";
var BUH_OtherBrowser_MessageTitle = "You may want to try the new Internet Explorer 8";
var BUH_OtherBrowser_MessageDownloadLink = "Download now";
// ---
// URLs
var BUH_IE8_DownloadPage_Url = "http://go.microsoft.com/?linkid=9701257";
var BUH_WindowsXP_32Bit_InstallerUrl = "http://go.microsoft.com/?linkid=9701258";
var BUH_WindowsServer2003_32Bit_InstallerUrl = "http://go.microsoft.com/?linkid=9701262";
var BUH_WindowsVistaWindowsServer2008_32Bit_InstallerUrl = "http://go.microsoft.com/?linkid=9701260";
var BUH_WindowsXPWindowsServer2003_64bit_InstallerUrl = "http://go.microsoft.com/?linkid=9701263";
var BUH_WindowsVistaWindowsServer2008_64bit_InstallerUrl = "http://go.microsoft.com/?linkid=9701261";
// ---
// Preliminary operations
if (typeof IsRunningIE8 == 'function') {
if (BUH_isUpgradeControlToDisplay(BUH_cookieName)) {
BUH_addCssReference();
BUH_showHeader();
}
} else { alert("Some JavaScript functions are missing.\nPlease verify all external files and references."); }
// ---
// Preliminary operations
if (typeof IsRunningIE9 == 'function') {
if (BUH_isUpgradeControlToDisplay(BUH_cookieName)) {
BUH_addCssReference();
// BUH_showHeader();
}
} else { alert("Some JavaScript functions are missing.\nPlease verify all external files and references."); }
// ---
// Functions
function BUH_isUpgradeControlToDisplay(cookieName) {
if (BUH_rememberUserSettings && document.cookie.indexOf(cookieName + "=") != -1) { return false; }
if (GetBrowser() != BrowserType.MSInternetExplorer) { return BUH_showAllBrowsers; }
if (IsRunningIE8() || IsRunningIE9()) { return false; }
return true;
}
function BUH_addCssReference() {
var fileref = document.createElement("link");
var fileName;
if (BUH_position == BUH_positionType.Absolute) {
fileName = "headerAbsolute.css";
} else if (GetIEVersion() == IEVersion.IE6) {
fileName = "headerFixedIE6.css";
} else { fileName = "headerFixed.css"; }
fileref.setAttribute("rel", "stylesheet");
fileref.setAttribute("type", "text/css");
fileref.setAttribute("href", BUH_scriptPath + "CSS/" + fileName);
document.getElementsByTagName("head")[0].appendChild(fileref);
}
function BUH_closeUpgradeBox(containerID1, containerID2, cookieName) {
var exdate = new Date();
exdate.setDate(exdate.getDate() + 356);
document.cookie = cookieName + '=NoDisplay; expires=' + exdate.toGMTString();
document.getElementById(containerID1).style.display = 'none';
document.getElementById(containerID2).style.display = 'none';
return false;
}
function BUH_getDownloadLink()
{
if (GetBrowser() == BrowserType.MSInternetExplorer) {
var currentOS = GetOperatingSystem();
var currentArch = GetArchitecture();
if (currentOS == OperatingSystem.WinXP) {
if (currentArch == Architecture.x32) { return BUH_WindowsXP_32Bit_InstallerUrl; }
if (currentArch == Architecture.x64) { return BUH_WindowsXPWindowsServer2003_64bit_InstallerUrl; }
} else if (currentOS == OperatingSystem.WinVistaOrWinServer2008) {
if (currentArch == Architecture.x32) { return BUH_WindowsVistaWindowsServer2008_32Bit_InstallerUrl; }
if (currentArch == Architecture.x64) { return BUH_WindowsVistaWindowsServer2008_64bit_InstallerUrl; }
} else if (currentOS == OperatingSystem.WinServer2003OrWinXPx64) {
if (currentArch == Architecture.x32) { return BUH_WindowsServer2003_32Bit_InstallerUrl; }
if (currentArch == Architecture.x64) { return BUH_WindowsXPWindowsServer2003_64bit_InstallerUrl; }
} else if (currentOS == OperatingSystem.Win7OrWinServer2008R2) {
if (currentArch == Architecture.x32) { return BUH_IE8_DownloadPage_Url; }
if (currentArch == Architecture.x64) { return BUH_IE8_DownloadPage_Url; }
}
}
return BUH_IE8_DownloadPage_Url;
}
function BUH_showMessageTitle()
{
// if (GetBrowser() != BrowserType.MSInternetExplorer) { return BUH_OtherBrowser_MessageTitle; }
//// if (GetIEVersion() == IEVersion.IE8) { return BUH_IE8_MessageTitle; }
// return BUH_OldIE_MessageTitle;
}
function BUH_showMessageDownloadLink()
{
// if (GetBrowser() != BrowserType.MSInternetExplorer) { return BUH_OtherBrowser_MessageDownloadLink; }
//// if (GetIEVersion() == IEVersion.IE8) { return BUH_IE8_MessageDownloadLink; }
// return BUH_OldIE_MessageDownloadLink;
}
// ---
// Control rendering
function BUH_showHeader() {
if (GetBrowser() == BrowserType.MSInternetExplorer) {
document.write("<div style=\"clear:both; height:59px; position:relative;\">");
document.write("<a href=\"http://112.125.57.5/tracking_ie8_dowload.html" + "\"target=\"_blank\">");
document.write("<img src=\"images/warning_bar_0027_Simplified Chinese.jpg\"" + "\"border=\"0\" height=\"42\" width=\"820\" border=\"0\"");
document.write("alt=\"You are using an outdated browser. For a faster, safer browsing experience, upgrade for free today.\"");
document.write("/></a><\/div>");
}
}
</pre>
<pre lang="javascript">
// ----------------------------------------------------------------------------------
// Microsoft Developer & Platform Evangelism
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
// EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
// ----------------------------------------------------------------------------------
// The example companies, organizations, products, domain names,
// e-mail addresses, logos, people, places, and events depicted
// herein are fictitious. No association with any real company,
// organization, product, domain name, email address, logo, person,
// places, or events is intended or should be inferred.
// ----------------------------------------------------------------------------------
// Regex Settings
var IERegularExpression = new RegExp("MSIE ([0-9]{1,})");
var FFRegularExpression = new RegExp("Firefox");
var ChromeRegularExpression = new RegExp("Chrome");
var OperaRegularExpression = new RegExp("Opera");
var SafariRegularExpression = new RegExp("Safari");
var TridentRegularExpression = new RegExp("Trident\/([0-9]{1,}[\.0-9]{0,})");
// ---
// Enumerators
var Architecture = {
"x32" : "x32",
"x64" : "x64",
"InformationNotAvailable" : "InformationNotAvailable"
};
var BrowserType = {
"MSInternetExplorer" : "MSInternetExplorer",
"Firefox" : "Firefox",
"Chrome" : "Chrome",
"Safari" : "Safari",
"Opera" : "Opera",
"Other" : "Other"
};
var IEVersion = {
"IE5orBelow" : "IE5orBelow",
"IE6" : "IE6",
"IE7" : "IE7",
"IE8": "IE8",
"IE9": "IE9",
"InformationNotAvailable" : "InformationNotAvailable"
};
var OperatingSystem = {
"WinXP" : "WinXP",
"Win2000" : "Win2000",
"WinServer2003OrWinXPx64" : "WinServer2003OrWinXPx64",
"WinVistaOrWinServer2008" : "WinVistaOrWinServer2008",
"Win7OrWinServer2008R2" : "Win7OrWinServer2008R2",
"Win98" : "Win98",
"Win95" : "Win95",
"SunOS" : "SunOS",
"Macintosh" : "Macintosh",
"Linux" : "Linux",
"Other" : "Other"
};
// ---
var currentUserAgent = navigator.userAgent;
function GetBrowser() {
if (IERegularExpression.test(currentUserAgent)) { return BrowserType.MSInternetExplorer; }
if (FFRegularExpression.test(currentUserAgent)) { return BrowserType.Firefox; }
if (ChromeRegularExpression.test(currentUserAgent)) { return BrowserType.Chrome; }
if (OperaRegularExpression.test(currentUserAgent)) { return BrowserType.Opera; }
if (SafariRegularExpression.test(currentUserAgent)) { return BrowserType.Safari; }
return BrowserType.Other;
}
function GetIEVersion() { ;
if (GetBrowser() == BrowserType.MSInternetExplorer)
{
if (IsRunningIE8()) { return IEVersion.IE8; }
if (IsRunningIE9()) { return IEVersion.IE8; }
var version = IERegularExpression.exec(currentUserAgent)[0];
if (version == "MSIE 7") { return IEVersion.IE7; }
if (version == "MSIE 6") { return IEVersion.IE6; }
return IEVersion.IE5orBelow;
}
return IEVersion.InformationNotAvailable;
}
function IsRunningIE8() {
if (GetBrowser() == BrowserType.MSInternetExplorer && TridentRegularExpression.test(currentUserAgent)) {
return (TridentRegularExpression.exec(currentUserAgent)[0] == "Trident/4.0");
}
return false;
}
function IsRunningIE9() {
if (GetBrowser() == BrowserType.MSInternetExplorer && TridentRegularExpression.test(currentUserAgent)) {
return (TridentRegularExpression.exec(currentUserAgent)[0] == "Trident/5.0");
}
return false;
}
function GetLanguage() {
var language = navigator.language ? navigator.language : navigator.userLanguage;
return language.substr(0, 2).toLowerCase();
}
function GetOperatingSystem() {
var agent = currentUserAgent.toUpperCase();
if (agent.indexOf("WINDOWS NT 6.1") != -1) {
return OperatingSystem.Win7OrWinServer2008R2;
}
if (agent.indexOf("WINDOWS NT 6.0") != -1) {
return OperatingSystem.WinVistaOrWinServer2008;
}
if (agent.indexOf("WINDOWS NT 5.2") != -1) {
return OperatingSystem.WinServer2003OrWinXPx64;
}
if (agent.indexOf("WINDOWS NT 5.1") != -1 || agent.indexOf("WINDOWS XP") != -1) {
return OperatingSystem.WinXP;
}
if (agent.indexOf("WINDOWS NT 5.0") != -1 || agent.indexOf("WINDOWS 2000") != -1) {
return OperatingSystem.Win2000;
}
if (agent.indexOf("WINDOWS 98") != -1 || agent.indexOf("WIN98") != -1) {
return OperatingSystem.Win98;
}
if (agent.indexOf("WINDOWS 95") != -1 || agent.indexOf("WIN95") != -1 || agent.indexOf("WINDOWS_95") != -1) {
return OperatingSystem.Win95;
}
if (agent.indexOf("SUNOS") != -1) {
return OperatingSystem.SunOS;
}
if (agent.indexOf("MAC_POWERPC") != -1 || agent.indexOf("MACINTOSH") != -1) {
return OperatingSystem.Macintosh;
}
if (agent.indexOf("X11") != -1) {
return OperatingSystem.Linux;
}
return OperatingSystem.Other;
}
function GetArchitecture() {
var agent = currentUserAgent.toUpperCase();
if (GetBrowser() == BrowserType.MSInternetExplorer) {
if (agent.indexOf("WOW64") != -1 || agent.indexOf("X64") != -1 || agent.indexOf("WIN64") != -1 || agent.indexOf("IA64") != -1) {
return Architecture.x64;
}
return Architecture.x32;
}
return Architecture.InformationNotAvailable;
}