#162006/6/5 20:56:20
限制输入的数字范围
<input name=num type=text onblur="return checkinput()" onkeyup="this.value=this.value.replace(/\D/gi,'')">
<script>
function checkinput(){
if(num.value>30||num.value<0){
alert("请输入0－30的数字");
num.value=="";
num.focus();
return false;
}
}
</script>
