JS时间工具类

    /**       * 时间对象的格式化       */        Date.prototype.format = function(format)        {            /*           * format="yyyy-MM-dd hh:mm:ss";           */            var o = {            "M+" : this.getMonth() + 1,            "d+" : this.getDate(),            "h+" : this.getHours(),            "m+" : this.getMinutes(),            "s+" : this.getSeconds(),            "q+" : Math.floor((this.getMonth() + 3) / 3),            "S" : this.getMilliseconds()            }                        if (/(y+)/.test(format))            {            format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));            }                        for (var k in o)            {            if (new RegExp("(" + k + ")").test(format))            {            format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));            }            }            return format;        }        /**        * 获取给定日期的最大天数        * yyyy-MM-dd         */        Date.prototype.maxDay  = function(){            var curDate = new Date(this.getFullYear(),this.getMonth(),1);            var nextDate = new Date(this.getFullYear(),this.getMonth()+1,1);            var days = (nextDate.getTime()-curDate.getTime())/(24*3600*1000);            return days;        }