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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<head>
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<script type="text/javascript">
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function isKeyPressed(event)
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{
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  if (event.metaKey==1)
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    {
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    alert("The meta key was pressed!")
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    }
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  else
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    {
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    alert("The meta key was NOT pressed!")
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    }
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  }
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​
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</script>
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</head>
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<body onmousedown="isKeyPressed(event)">
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​
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<p>Click somewhere in the document. An alert box will tell you if you pressed the meta key or not.</p>
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​
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</body>
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</html>
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​