How does jquery determine whether it is an IE browser?

Jquery method to determine whether it is an IE browser: You can use the jquery browser method to determine, such as [$.browser.msie]. If we still need to distinguish the version, we need to use [jQuery.browser.version 】method.

The operating environment of this tutorial: windows10 system, jquery3.2.1 version. This method is suitable for all brands of computers.

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Jquery method to determine whether it is an IE browser:

JQuery You can use the jQuery.browser method to determine the browser type. The return value can be: safari, opera, msie, mozilla. If the return value is msie, it means the browser is ie.

Of course sometimes we also need to distinguish versions, which requires the use of jQuery.browser.version.

Example:

function JudgeBroswer() {
        if($.browser.msie) {
            alert("this is msie!"); //IE        }
        else if($.browser.safari)
        {
            alert("this is safari!"); //Safari         }
        else if($.browser.mozilla)
        {
            alert("this is mozilla!");  //Firefox        }
        else if($.browser.opera) {
            alert("this is opera");     //Opera        }
    }

jquery source code:

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)
    };

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