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The jQuery hasClass() method is used to check whether the selected element contains the specified class name. Its usage syntax is "$(selector).hasClass(classname)". The parameter classname indicates that it needs to be searched in the selected element. the type.
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jQuery hasClass() definition and usage
hasClass() method checks whether the selected element contains the specified class name.
If the selected element contains the specified class, this method returns "true".
Syntax
$(selector).hasClass(classname)
Parameters
classname required. Specifies the class to be searched for in the selected elements.
Example
Check whether the
element contains "intro" class:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP中文网</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.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>Running effect:
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