案例：html5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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​
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<script type="text/javascript">
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​
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localStorage.lastname="Smith";
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document.write("Last name: " + localStorage.lastname);
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​
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</script>
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​
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</body>
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</html>
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​