案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<html>
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<head>
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​
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<script type="text/javascript">
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function getEventTrigger(event)
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  {
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  x=event.target;
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  alert("The id of the triggered element: " + x.id);
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  }
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</script>
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</head>
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​
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<body >
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​
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<p id="p1" onmousedown="getEventTrigger(event)">
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Click on this paragraph. An alert box will show which element triggered the event.</p>
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​
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</body>
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</html>
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​