要使用JavaScript将活动类添加到当前元素，代码如下-
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
.btn {
border: none;
outline: none;
padding: 10px 16px;
background-color: #6ea2f0;
cursor: pointer;
color:white;
font-size: 18px;
}
.active, .btn:hover {
background-color: #666;
color: white;
}
</style>
</head>
<body>
<h1>Active Button Example</h1>
<div id="sampleDiv">
<button class="btn">Giraffe</button>
<button class="btn active">Cow</button>
<button class="btn">Lion</button>
<button class="btn">Leopard</button>
<button class="btn">Cheetah</button>
</div>
<h2>Press any of the above button to set it class to active</h2>
<script>
var btns = document.querySelectorAll(".btn");
Array.from(btns).forEach(item => {
item.addEventListener("click", () => {
var selected = document.getElementsByClassName("active");
selected[0].className = selected[0].className.replace(" active", "");
item.className += " active";
});
});
</script>
</body>
</html>输出结果
上面的代码将产生以下输出-
在单击任何其他按钮时-