<head>
<title>test</title>
<script language="javascript" type="text/javascript">
function validateLength(obj)
{
obj.value.length < obj.getAttribute("maxlength"); }
</script>
</head>
<body>
<label for="userName">用户名:</label>
<input id="userName" type="text" maxlength="10" _disibledevent="5"></textarea>
</body>
</html>
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