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 alertValue()
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  {
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  alert(document.getElementById("password1").value)
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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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<form>
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<input type="password" id="password1" value="thgrt456" />
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<input type="button" id="button1" onclick="alertValue()" value="Show default value" />
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</form>
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​
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</body>
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</html>
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​