限制为整数
<html>
<head>
<script language="javascript" type="text/javascript">
var G=document.getElementById;
function checkNumber(){
var reg = /^(?:0|[1-9][0-9]?|100)$/;
var strNumber = G("txtNumber").value;
alert(reg.test(strNumber))
}
</script>
</head>
<body >
<input type="text" value="" id="txtNumber" title="Please enter a number witch between 0 and 100 ..">
<button onclick="checkNumber();">CheckNumber</button>
</body>
</html>
限制为货币
<script language="JavaScript" type="text/javascript">
<!--
function checkMoney(obj){
var tempValue=obj.value.replace(/(^\s )|(\s $)/g,'');
if(!tempValue){return;}
if(/^-?\d (\.\d )?$/.test(tempValue)){
obj.value=parseFloat(tempValue).toFixed(2);
}else{
alert('请输入合法的货币值！');
obj.select();
return;
}
}
//-->
</script>
onblur="checkMoney(this)"