3 modification methods: 1. Use attr() to modify the value of the class attribute, the syntax is "element object.attr("class","new class name");". 2. Use prop() to modify the value of the class attribute, the syntax is "element object.prop("class","new class name");". 3. Use removeClass() and addClass(), the syntax is "element object.removeClass("old class name").addClass("new class name");".
The operating environment of this tutorial: windows7 system, jquery3.6.1 version, Dell G3 computer.
jquery method to change classname (class name)
Method 1: Use attr() to modify
attr() can set the attributes and values of elements
You only need to modify the value of the class attribute, syntax:
$(selector).attr("class","新类名");Example
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="js/jquery-3.6.1.min.js"></script>
<script>
$(document).ready(function() {
$("button").click(function() {
$("div").attr("class", "box2");
});
});
</script>
<style>
.box1 {
height: 150px;
background-color: #AFEEEE;
}
.box2 {
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<div class="box1"></div>
<br>
<button>改变classname（类名）</button>
</body>
</html>
Method 2: Use prop() to modify
attr() can set the attributes and values of the element
You only need to modify the class attribute Just change the value and modify the syntax:
$(selector).prop("属性名","新类名");Example
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="js/jquery-3.6.0.min.js"></script>
<script>
$(document).ready(function() {
$("button").click(function() {
$("div").prop("class","box1");
});
});
</script>
<style>
.box1 {
height: 150px;
background-color: #AFEEEE;
}
.box2 {
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<div class="box2"></div>
<br>
<button>改变classname（类名）</button>
</body>
</html>
##Method 3: Modify using removeClass() and addClass()
- Use removeClass() to delete the old class
- Use addClass() to add a new class
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="js/jquery-3.6.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("button").click(function(){
$("p").removeClass("intro1").addClass("intro2");
});
});
</script>
<style>
.intro1 {
font-size: 120%;
color: red;
}
.intro2 {
color: peru;
background-color: aquamarine;
}
</style>
</head>
<body>
<p class="intro1">测试段落</p>
<button>改变classname（类名）</button>
</body>
</html>
jQuery tutorial, web front-end video】
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