<form action="" method="post" onSubmit="return confirm();" >

</form>

<script>

function checkCoupon(){

   var tof = true;var max_num=$('#max_num').val();

   var type="^[0-9]*[0-9][0-9]*$";

   var r=new RegExp(type);

   var flag=r.test(max_num);

   if (!flag) {

       tof = false;

       alert("最多绑定数量需为大于等于零的自然数");

    }return tof;

}

</script>