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@@ -0,0 +1,25 @@
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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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+</head>
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+<body>
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+ <!-- 在html标签上 style属性内写的样式 称之为內联样式 -->
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+ <div style="font-size: 50px;font-weight: bolder;" class="box">hello world</div>
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+ <button id="btn">按钮</button>
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+ <script>
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+ var oBox = document.getElementsByClassName("box")[0];
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+ var oBtn = document.getElementById("btn");
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+
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+ oBtn.onclick = function(){
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+ oBox.style.color = "red";
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+ // js控制样式的时候如果出现中横线连接符 换成驼峰命名
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+ var testNum = 100;
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+ oBox.style.marginLeft = testNum + "px";
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+ }
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+
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+ </script>
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+</body>
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+</html>
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