<div id="test">零五网（www.02405.com）</div>

<script>
let test = document.getElementById("test");
//原生js添加元素class类名
test.classList.add("active");
//原生js删除元素class类名
test.classList.remove("active");
</script>

引申阅读：JQuery添加或删除class类名

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