案例:html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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<body>
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<p id="Demo">This is paragraph 1.</p>
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<p id="demo">This is paragraph 2.</p>
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<script>
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// Only parapraph 2 will be overwritten
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document.getElementById("demo").innerHTML = "HELLO.";
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</script>
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</body>
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</html>
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