用JavaScript限制textarea输入长度 (For: IE、Firefox ...)
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<head>
<title> Code：用JavaScript限制textarea输入长度 (For: IE、Firefox ...)</title>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="author" content="枫岩,CNLei.y.l@gmail.com">
<meta name="keywords" content="textarea,输入长度" />
<meta name="description" content="用JavaScript限制textarea输入长度 (For: IE、Firefox ...)" />
<style type="text/css" media="all">
body {font-size:14px;}
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</head>
<body>
maxlength=10
<textarea maxlength="10" onkeyup="return isMaxLen(this)"></textarea>
maxlength=20
<textarea maxlength="20" onkeyup="return isMaxLen(this)"></textarea>
<script type="text/javascript">
function isMaxLen(o){
var nMaxLen=o.getAttribute? parseInt(o.getAttribute("maxlength")):"";
if(o.getAttribute && o.value.length>nMaxLen){
o.value=o.value.substring(0,nMaxLen)
}
}
</script>
</body>
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