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@@ -0,0 +1,39 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .box{
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+ width: 100px;
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+ height: 100px;
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+ background-color: red;
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+ }
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+ .box2{
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+ border:3px solid black;
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+ }
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+ .box3{
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+ margin-top: 200px;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <!-- <div class="box box2"></div> -->
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+ <div></div>
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+ <script>
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+ var oBox = document.getElementsByTagName("div")[0];
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+ // oBox.setAttribute("class","box");
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+ // 控制标签类名
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+ // oBox.className = "box";
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+ oBox.className = "box box2";
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+
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+ // var str = "box2";
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+ // oBox.classList.remove("box2");
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+ // oBox.classList.add("box2");
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+
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+ oBox.classList.replace("box2","box3");
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+
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+ </script>
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+</body>
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+</html>
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