Date.prototype.Format = function (fmt) { //author: meizz        var o = {            "M+": this.getMonth() + 1, //月份            "d+": this.getDate(), //日            "h+": this.getHours(), //小时            "m+": this.getMinutes(), //分            "s+": this.getSeconds(), //秒            "q+": Math.floor((this.getMonth() + 3) / 3), //季度            "S": this.getMilliseconds() //毫秒        };        if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));        for (var k in o)            if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));        return fmt;    }    var time1 = new Date().Format("yyyy-MM-dd");    var time2 = new Date(2018,0,1).Format("yyyy-MM-dd hh:mm:ss");    console.log(time2);