<div>
        <input type="text" onkeyup="limitInput(this);">
        <script type="text/javascript">
            function limitInput(o){
                var value=o.value;
                var min=1;
                var max=1000;
                if(parseInt(value)<min||parseInt(value)>max){
                    alert('输入错误');
                    o.value='';
                }
            }
        </script>
    </div>