JavaScript detects the browser type and version of code _javascript tips

Code to detect the browser and its version

Copy Code code as follows:

Getbrowser:function () {
var browser = {
Msie:false, Firefox:false, Opera:false, Safari:false,
Chrome:false, Netscape:false, appname: ' Unknown ', version:0
},
useragent = Window.navigator.userAgent.toLowerCase ();
if (/(Msie|firefox|opera|chrome|netscape) \d+ (\d[\d.) *)/.test (useragent)) {
BROWSER[REGEXP.$1] = true;
Browser.appname = regexp.$1;
Browser.version = regexp.$2;
else if (/version\d+ (\d[\d.) *). *safari/.test (useragent)) {//Safari
Browser.safari = true;
Browser.appname = ' Safari ';
Browser.version = regexp.$2;
}
return browser.appname + browser.version;
}

Object/Feature Detection method

This method is a common method for judging browser capabilities rather than the exact model of browsers. Most JS experts think this method is the most appropriate, because they think the script written by this method will stand the test of the future.

Get the version number of IE browser

Returns a value that shows the major version number of IE

function Getiever () {

Get client Information

var B = ua.indexof (///detection of the location of the special string "MSIE" )

if (b < 0) {

  return 0;

}

Return parsefloat (ua.substring (b + 5, Ua.indexof) (//Intercept version number string and convert to numeric value

}

return value 8 (my IE8)

You can use this approach if you are more concerned about the capabilities of your browser than the actual identity.

User-agent String Detection method

The User-agent string provides a large amount of information about a Web browser, including the name and version of the browser.

Get client Information

var info = {

ie:/msie/.test (UA) &&!/opera/.test (UA),  //matching IE browser

OP:/opera/.test (UA),  //matching Opera browser

SA:/version.*safari/.test (UA),  ///Match Safari browser

Ch:/chrome/.test (UA),  //matching Chrome browser

FF:/gecko/.test (UA) &&!/webkit/.test (UA)  //matching Firefox browser

};

(info.ie) && alert ("IE browser");

(INFO.OP) && alert ("Opera browser");

(INFO.SA) && alert ("Safari browser");

(INFO.FF) && alert ("Firefox browser");

(info.ch) && alert ("Chrome browser");

Usually the most we do is to determine whether IE, the other browsers will generally meet the standard. Some customers are satisfied with IE and FF only. Then we can do this:

"Microsoft Internet Explorer");

To judge ie far more than one method, you can use IE more specific things, such as window. Activexobject,document.all and so on, these are the object/feature detection Method! Usually you have to write different styles in different browsers (because IE style parsing is different), you have to judge the version. You can do this.

Get the version number of IE browser

Returns a value that shows the major version number of IE

function Getiever () {

Get client Information

var B = ua.indexof (///detection of the location of the special string "MSIE" )

if (b < 0) {

  return 0;

}

Return parsefloat (ua.substring (b + 5, Ua.indexof) (//Intercept version number string and convert to numeric value

}

return value 7

Detection operating system:

var Iswin = (navigator.userAgent.indexOf (///If it is a Windows system, returns True

var Ismac = (navigator.userAgent.indexOf (////If is Macintosh system, returns True

var Isunix = (navigator.userAgent.indexOf (///If UNIX system, returns True

var islinux = (navigator.userAgent.indexOf (////If Linux system, returns True

Most of the text comes from the JavaScript journey