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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<html>
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<body>
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​
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<button accessKey="a" id="button1">Click me!</button>
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<p>AccessKey for button is:
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<script type="text/javascript">
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x=document.getElementById('button1');
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document.write(x.accessKey);
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</script></p>
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​
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</body>
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</html>
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​