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<input type="text" name="num" onkeyup="???"><%=num%>
<input type="text" name="num" onkeyup="checkValue(this)">function checkValue(obj){
var val = this.value;
var maxValue = '你的最大值';
if(val>maxValue){
this.value = 0;
}
}<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<input type="text" name="num" id="num">
<script>
var maxnum = <%=num%>;
document.getElementById('num').onkeyup = function(){
if(this.value.length > maxnum.length){
this.value = 0;
}
};
</script>
</body>
</html>
