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How to modify the class name of dom element in jquery
- 青灯夜游Original
- 2022-05-30 14:32:281629browse
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")".
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>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>
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>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>
[Recommended learning: jQuery video tutorial、web front-end video】
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