This article mainly introduces the usage of hasClass() in jQuery. I hope it will be helpful to friends in need!
What does hasclass mean?
hasClass() is a built-in method in jQuery that is used to check whether an element with a specified class name exists.
Syntax:
$(selector).hasClass(className);
Parameters: It accepts a "className" parameter, which specifies the class name that needs to be searched in the selected element.
Return value: If the search is successful, return true, otherwise return false.
jQuery hasClass() method usage example:
<html>
<head>
<meta charset="UTF-8">
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script>
$(document).ready(function() {
$("button").click(function() {
alert($("p").hasClass("find"));
});
});
</script>
<style>
.find {
font-size: 120%;
color: green;
}
body {
width: 50%;
height: 200px;
border: 2px solid green;
padding: 20px;
}
</style>
</head>
<body>
<h1>标题1</h1>
<p class="find">PHP中文网!</p>
<p>这是普通段落</p>
<button>点击我!</button>
</body>
</html>Output:
When clicking "Click me " button, the following pop-up window appears
Related recommendations: "jQuery Tutorial"
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