Home > Developer > JavaScript

Js identifies different browsers Based on userAgent for judgment, jsuseragent

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Js identifies different browsers Based on userAgent for judgment, jsuseragent

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 = {// viewer ie: 0, firefox: 0, safari: 0, konq: 0, opera: 0, chrome: 0, ver: null}; var ua = navigator. userAgent; // the browser checks if (window. opera) {// opera disguise, so the engine is checked first. 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 it is Chrome or Safariif (/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 {// approximately determines the version number 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 Firefoxif (/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 code for Chrome} else if (client. browser. safari) {// run the code for Safari} else if (client. engine. gecko) {if (client. browser. firefox) {// execute code for Firefox} else {// execute code for other Gecko browsers }}


How does js differentiate browsers and require code,

Alert (navigator. userAgent );
You can run this code. The values obtained by different browsers are different. The identification and version information of the browser are included.

If you are too lazy to write code, enter the following code in the address bar of your browser and press Enter:
Javascript: alert (navigator. userAgent)

It's really a failure:
Var isFF = navigator. userAgent. toLowerCase (). indexOf ('Firefox ');
Var isChrome = navigator. userAgent. toLowerCase (). indexOf ('chrome ');
Var isOpera = navigator. userAgent. toLowerCase (). indexOf ('Opera ');
Var isIE = navigator. userAgent. toLowerCase (). indexOf ('msie ');

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>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
why website look different on different browsers different web browsers for windows how to test website on different browsers test website on different browsers and devices different browsers trident based browsers different web browsers
Related Article
JavaScript solution to the eight Queens Problem method summar...
Http status code: 301, 302 redirection, 302 redirection
The html space symbol nbsp; ensp; emsp; introduces and implem...
Ajax and 302 response code Testing
Ajax and 302 response code test_javascript-js tutorial

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More