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Js recognition of different browsers and js Recognition

Source: Internet
Author: User
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Js recognition of different browsers and js Recognition

Check the browser, pay attention to the browser judgment order, mainly based on userAgent for judgment.

// Check the browser

Var client = function (){
Var engine = {
Ie: 0,
Gecko: 0,
Webkit: 0,
Khtml: 0,
Opera: 0,
Ver: null
};
Var browser = {
// Browser
Ie: 0,
Firefox: 0,
Safari: 0,
Konq: 0,
Opera: 0,
Chrome: 0,
Ver: null
};
Var ua = navigator. userAgent;
// Browser detection is ordered
If (window. opera) {// opera disguise, so detection is preferred
Engine. ver = browser. ver = window. opera. version ();
Engine. opera = browser. opera = parseFloat (engine. ver );
} Else if (/AppleWebKit \/(\ S +)/. test (ua )){
Engine. ver = RegExp ["$1"];
Engine. webkit = parseFloat (engine. ver );


// Determine whether Chrome or Safari is used
If (/Chrome \/(\ S +)/. test (ua )){
Browser. ver = RegExp ["$1"];
Browser. chrome = parseFloat (browser. ver );
} Else if (/Version \/(\ S +)/. test (ua )){
Browser. ver = RegExp ["$1"];
Browser. safari = parseFloat (browser. ver );
} Else {
// Determine the version number in an approximate way
Var safariVersion = 1;
If (engine. webkit <100 ){
SafariVersion = 1;
} Else if (engine. webkit <312 ){
SafariVersion = 1.2;
} Else if (engine. webkit <412 ){
SafariVersion = 1.3;
} Else {
SafariVersion = 2;
}


Browser. safari = browser. ver = safariVersion;
}




} Else if (/KHTML \/(\ S +)/. test (ua) |/Konqueror \/([^;] +)/. test (ua )){
Engine. ver = browser. ver = RegExp ["$1"];
Engine. khtml = browser. konq = parseFloat (engine. ver );
} Else if (/rv :( [^ \)] +) \) Gecko \/\ d {8}/. test (ua )){
Engine. ver = RegExp ["$1"];
Engine. gecko = parseFloat (engine. ver );
// Determine if it is Firefox
If (/Firefox \/(\ S +)/. test (ua )){
Browser. ver = RegExp ["$1"];
Browser. firefox = parseFloat (browser. ver );
}
} Else if (/MSIE ([^;] +)/. test (ua )){
Engine. ver = browser. ver = RegExp ["$1"];
Engine. ie = browser. ie = parseFloat (engine. ver );
}
Return {
Engine: engine,
Browser: browser
};
}();


// Call

If (client. engine. webkit) {// if it's WebKit
If (client. browser. chrome ){
// Execute the code for Chrome
} Else if (client. browser. safari ){
// Execute the code for Safari
}
} Else if (client. engine. gecko ){
If (client. browser. firefox ){
// Execute the code for Firefox
} Else {
// Execute the code for other Gecko browsers
}
}


Js detects the browser type (please write code)

Will only distinguish Firefox and IE, will not be the window of the world ....

Such
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "www.w3.org/..al.dtd">
<Html xmlns = "www.w3.org/5o/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> untitled document </title>
<Script>
If (document. all) {alert ("ie ");}
Else alert ("s B Firefox ");
</Script>
</Head>

<Body>
</Body>
</Html>

How does js identify browsers?

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "www.w3.org/..al.dtd">
<Html xmlns = "www.w3.org/5o/xhtml">
<Script type = "text/javascript">
Function browserinfo (){
Var Browser_Name = navigator. appName;
Var Browser_Version = parseFloat (navigator. appVersion );
Var Browser_Agent = navigator. userAgent;
Var Actual_Version, Actual_Name;
Var is_IE = (Browser_Name = "Microsoft Internet Explorer"); // determines whether the browser is an Internet Explorer.
Var is_NN = (Browser_Name = "Netscape"); // determines whether the browser is a netscape Browser.
Var is_op = (Browser_Name = "Opera"); // determines whether the browser is operabrowser.
If (is_NN ){
// Upper 5.0 need to be process, lower 5.0 return directly
If (Browser_Version> = 5.0 ){
If (Browser_Agent.indexOf ("Netscape ")! =-1 ){
Var Split_Sign = Browser_Agent.lastIndexOf ("/");
Var Version = Browser_Agent.lastIndexOf ("");
Var Bname = Browser_Agent.substring (0, Split_Sign );
Var Split_sign2 = Bname. lastIndexOf ("");
Actual_Version = Browser_Agent.substring (Split_Sign + 1, Browser_Agent.length );
Actual_Name =... the remaining full text>

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