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How to modify the class name of dom element in jquery

青灯夜游

May 30, 2022 pm 02:32 PM

jquery

Two modification methods: 1. Use attr() to modify the value of the class attribute, the syntax is "dom element object.attr("class","new class name")"; 2. After removing the old class To add a new class, the syntax is "dom element object.removeClass("old class name").addClass("new class name")".

How to modify the class name of dom element in jquery

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

jquery method of modifying the class name of a dom element

Method 1: Directly use attr() to modify the value of the class attribute

attr() method can set the attribute value of the selected element.

<!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(){
				  $("p:first").attr("class","intro2");
				});
			});
			</script>
		<style type="text/css">
			.intro1 {
				font-size: 120%;
				color: red;
			}
			.intro2 {
				font-size: 120%;
				color: green;
			}
		</style>
	</head>
	<body>

		<h1 id="这是一个段落标题">这是一个段落标题</h1>
		<p class="intro1">这是一个段落</p>
		<p> 这是另外一个段落</p>
		<button>修改p元素的 "intro1" 类</button>

	</body>
</html>

How to modify the class name of dom element in jquery

Method 2: Use removeClass() and addClass()

Use removeClass() first Remove the specified class
and then use addClass() to add a new 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(){
				  $("p:first").removeClass("intro1").addClass("intro2");
				});
			});
			</script>
		<style type="text/css">
			.intro1 {
				font-size: 120%;
				color: red;
			}
			.intro2 {
				font-size: 120%;
				color: green;
			}
		</style>
	</head>
	<body>

		<h1 id="这是一个段落标题">这是一个段落标题</h1>
		<p class="intro1">这是一个段落</p>
		<p> 这是另外一个段落</p>
		<button>修改p元素的 "intro1" 类</button>

	</body>
</html>

How to modify the class name of dom element in jquery

[Recommended learning: jQuery video tutorial、web front-end video】

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