SOURCE

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
        	"w+": this.getDay(), //天
          "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 hh:mm:ss 星期w');
			console.log(time1)
      var time2 = new Date().Format("yyyy年MM月dd日");
			console.log(time2)
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