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 show_confirm()
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{
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var r=confirm("Press a button!");
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if (r==true)
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  {
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  alert("You pressed OK!");
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  }
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else
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  {
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  alert("You pressed Cancel!");
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  }
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}
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</script>
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</head>
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<body>
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​
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<input type="button" onclick="show_confirm()" value="Show a confirm box" />
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​
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</body>
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</html>
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​