Under jQuery, the browser is determined through $.browser.

Use jQuery to determine the type of browser, mainly using the $.browser tool class

Usage method:
$.browser.['browser keyword' ]

The code is as follows:

$(function() { 
if($.browser.msie) { 
alert("this is msie"); 
} 
else if($.browser.safari) 
{ 
alert("this is safari!"); 
} 
else if($.browser.mozilla) 
{ 
alert("this is mozilla!"); 
} 
else if($.browser.opera) { 
alert("this is opera"); 
} 
else { 
alert("i don't konw!"); 
}

Let’s take a look at the source code of jQuery:

The code is as follows:

var userAgent = navigator.userAgent.toLowerCase(); 
// Figure out what browser is being used 
jQuery.browser = { 
version: (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [])[1], 
safari: /webkit/.test( userAgent ), 
opera: /opera/.test( userAgent ), 
msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ), 
mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent ) 
};

jQuery What is used is to match the userAgent with regular rules to determine the type and version of the browser.
If we want to determine whether the current browser is IE6, how should we determine it?
$.browser.msie&&($.browser.version == "6.0")&&!$.support.style
Similarly jQuery determines whether the browser is IE7
$.browser.msie&&($.browser .version == "7.0")
If you do not consider backward compatibility and do not want to import jQuery in order to determine each browser type
The easiest way to determine IE is

code As follows:

if(
document
.all){ 
alert("IE6") 
}

$.browser uses regular expression to match userAgent to determine the browser version and type. jquery.browser and jquery have been declared in the jquery1.3.2 version of the document. It is recommended that browser.version be deprecated and jquery.support can be used instead
But judging from the current situation, jquery.support is not easy to use and is very difficult to use. We still use $.browser honestly. Determine the browser type
If it is to determine the version of IE, I still recommend using IE’s conditional expression to write JS

The code is as follows:

<!--[if IE]> 
<script type="text/
javascript
"> 
alert("ie") 
</script> 
<![endif]--> 
<!--[if IE 6]> 
<script type="text/javascript"> 
alert("ie6") 
</script> 
<![endif]--> 
<!--[if IE 7]> 
<script type="text/javascript"> 
alert("ie7") 
</script> 
<![endif]-->

This is easier than our manual It is more accurate to judge the IE version through $.browser, and there is no need to remember how to use jquery's browser

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