JS时间格式化函数

Date.prototype.format = function (format) {

            var o = {

                "M+": this.getMonth() + 1, //month

                "d+": this.getDate(),    //day

                "h+": this.getHours(),   //hour

                "m+": this.getMinutes(), //minute

                "s+": this.getSeconds(), //second

                "q+": Math.floor((this.getMonth() + 3) / 3),  //quarter

                "S": this.getMilliseconds() //millisecond

            }

            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;

        }