案例:javascript案例     状态:可编辑再运行    进入竖版
 运行结果 
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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table,th,td
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{
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border:1px solid black;
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}
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</style>
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</head>
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<body>
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<h3>演示如何访问 TH 元素</h3>
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<table>
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 <tr>
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   <th id="myTh">名字</th>
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 </tr>
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 <tr>
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   <td>乔布斯</td>
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 </tr>
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</table>
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<p>点击按钮来改变 TH 元素的文本。</p>
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<button onclick="myFunction()">亲自试一试</button>
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<p id="demo"></p>
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<script>
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function myFunction()
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{
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var x = document.getElementById("myTh");
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x.innerHTML = "新的表头";
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}
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</script>
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</body>
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</html>
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