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 timedMsg()
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{
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var t=setTimeout("alert('5 seconds!')",5000)
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}
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</script>
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</head>
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<body>
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<form>
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<input type="button" value="显示计时的消息框!" onClick = "timedMsg()">
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</form>
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<p>点击上面的按钮。5 秒后会显示一个消息框。</p>
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</body>
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</html>
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