How to determine whether there is a certain class in jquery-JS Tutorial-php.cn

How to determine whether there is a certain class in jquery

青灯夜游

Release： 2021-11-12 17:00:02

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In jquery, you can use the hasClass() method to determine whether there is a certain class. The function of this method is to check whether the selected element contains the specified class. The syntax is "$(selector).hasClass(classname) ".

How to determine whether there is a certain class in jquery

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

In jquery, you can use the hasClass() method to determine whether there is a specified class.

How to determine whether there is a certain class in jquery

hasClass() method can check whether the selected element contains the specified class. This method returns "true" if the selected element contains the specified class.

Syntax format:

$(selector).hasClass(classname)

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classname: required parameter, specifies the class to be found in the specified element.

Example: Check if the

element contains "intro" Class:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="js/jquery-1.10.2.min.js">
</script>
<script>
$(document).ready(function(){
	$("button").click(function(){
		alert($("p").hasClass("intro"));
	});
});
</script>
<style type="text/css">
.intro{
	font-size:120%;
	color:red;
}
</style>
</head>
<body>

<h1>这是一个段落标题</h1>
<p class="intro">这是一个段落</p>
<p> 这是另外一个段落</p>
<button>是否有 p 元素使用了 "intro" 类?</button>

</body>
</html>

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How to determine whether there is a certain class in jquery

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