tryjsref_element_classlist_item 在线代码实例

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
<style>
.mystyle {
    width: 500px;
    height: 50px;
}
.anotherClass {
    background-color: lightblue;
}
.thirdClass {
    text-align: center;
    font-size: 25px;
    color: black;
    margin-bottom: 10px;
}
</style>
</head>
<body>
<p>点击按钮显示div元素第一个类的类名 (索引为 0) 。</p>
<div id="myDIV" class="mystyle anotherClass thirdClass">
我是一个 DIV 元素，我游三个类
</div>
<button onclick="myFunction()">点我</button>
<p><strong>注意：</strong> Internet Explorer 9 及更早 IE 版本浏览器不支持 classList 属性。</p>
<p id="demo"></p>
<script>
function myFunction() {
    var x = document.getElementById("myDIV").classList.item(0);
    document.getElementById("demo").innerHTML = x;
}
</script>
 
 
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运行结果
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