JS日期判断

<script type="text/javascript">

window.onload = function()

    {

           //这么写是为了实现js代码与html代码的分离，当我修改js时，不能影响html代码。

           document.getElementByIdx_x_x("frm1").onsubmit =

                    function(){

                             var d1 = this.d1.value;

                             var d2 = this.d2.value;

                             if(!verifyDate (d1)) {alert("第一个日期格式不对");return false;}

                             if(!verifyDate (d2)) {alert("第二个日期格式不对");return false;}

                             if(!compareDate(d1,d2)) {alert("第二个日期比第一日期小");return false;}                   

                    };

           }

           function compareDate(d1,d2)

           {

                    var arrayD1 = d1.split("-");

                    var date1 = new Date(arrayD1[0],arrayD1[1],arrayD1[2]);

                    var arrayD2 = d2.split("-");

                    var date2 = new Date(arrayD2[0],arrayD2[1],arrayD2[2]);

                    if(date1 > date2) return false;         

                    return true;

           }

           function verifyDate(d)

           {

                    var datePattern = /^\d{4}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2]\d|3[0-1])$/;

                    return datePattern.test(d);

           }