<!DOCTYPE html>
<html lang="ko" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
<script type="text/javascript">
function checklength(obj) {
var maxlength = parseInt(obj.getAttribute("maxlength"));
if (obj.value.length > maxlength) {
alert("제한");
obj.value = obj.value.substring(0, maxlength);;
}
}
</script>
</head>
<body>
<textarea id="hi" maxlength="5" onkeyup="return checklength(this)"></textarea>
</body>
</html>
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