js用正则表达式控制价格输入

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

    <head>

        <title>用正则表达式控制价格输入</title>

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

        <script type="text/javascript">

            var record={

                num:""

            }

            var checkDecimal=function(n){

                var decimalReg=/^\d{0,8}\.{0,1}(\d{1,2})?$/;//var decimalReg=/^[-\+]?\d{0,8}\.{0,1}(\d{1,2})?$/;

                if(n.value!=""&&decimalReg.test(n.value)){

                    record.num=n.value;

                }else{

                    if(n.value!=""){

                        n.value=record.num;

                    }

                }

            }

        </script>

    </head>

    <body>

        <h3>实用技巧：用正则表达式控制价格输入</h3>

        销售价<input maxlength="10" size="18" type="text" name="price" value="" onkeyup='checkDecimal(this)'/>

    </body>

</html>