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 maxLen()
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  {
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  var txt="Size=" + document.getElementById("name").size
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  var txt=txt + " and Max length=" + document.getElementById("name").maxLength
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  alert(txt)
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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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Name: <input type="text" id="name" value="Mickey Mouse" size="20" maxlength="30" />
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<br /><br />
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<input type="button" onclick="maxLen()" value="Alert size and maxLength" />
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</form>
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​
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</body>
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</html>
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​