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Editor to share with you jquery how to determine whether there is a specified class, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Method: 1, use the "$(element). HasClass (" class name ")" statement to check whether the specified class exists, if so, return "true"; 2, use the "$(element). Attr (" class ")" statement to get the value of the class attribute, if the value is equal to the class name to be checked, then the specified class exists.

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

Jquery determines whether a specified class exists

Method 1: using hasClass () method

The hasClass () method checks whether the selected element contains the specified class name. If the selected element contains the specified class, the method returns "true".

$(document) .ready (function () {$("button") .click (function () {var aversion $("p") .ready ("intro") If (a) {alert ("specified class exists");} else {alert ("specified class does not exist") }});}); .intro {font-size: 120% Color: red;} this is a paragraph title. This is a paragraph.

This is another paragraph.

Does any p element use the "intro" class?

Method 2: using attr () method

The attr () method returns the attribute value of the selected element.

The value of the class property can be obtained by the attr () method, and the specified class exists if the property value equals the class name that needs to be checked.

$(document) .ready (function () {$("button") .click (function () {var aversion $("p") .ready ("class") If (assigned = "intro1") {alert ("specified class exists");} else {alert ("specified class does not exist") }});}); .intro {font-size: 120% Color: red;} this is a paragraph title. This is a paragraph.

This is another paragraph.

Does any p element use the "intro1" class?

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