JS时间格式化

/*

    * 时间格式化

    */

    Date.prototype.format = function (format) {

        var date = {

            "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+)/i.test(format)) {

            format = format.replace(RegExp.$1, (this.getFullYear() + '').substr(4 - RegExp.$1.length));

        }

        for (var k in date) {

            if (date.hasOwnProperty(k)) {

                if (new RegExp("(" + k + ")").test(format)) {

                    format = format.replace(RegExp.$1,

                        RegExp.$1.length == 1

                        ? date[k]

                        : ("00" + date[k]).substr(("" + date[k]).length));

                }

            }

        }

        return format;

    }