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.shiftKey==1)
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    {
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    alert("The shift key was pressed!")
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    }
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  else
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    {
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    alert("The shift key was NOT pressed!")
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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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<p>在文档中点击某个位置。消息框会告诉你是否按下了 shift 键。</p>
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</body>
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</html>
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