js格林威治时间转换成正常时间

//时间转换
    changeTime(time) {
　　　　//time 为 '2020-06-15T07:23:17.000+0000'
      let time2 = this.myTime(time);
      let time3 = this.formatDateTime(time2);
      return time3; //time3 为转换后的时间 2020-06-15 15:23:14
    }, 
    myTime(date) {
      var arr = date.split("T");
      var d = arr[0];
      var darr = d.split("-");
      var t = arr[1];
      var tarr = t.split(".000");
      var marr = tarr[0].split(":");
      var dd =
        parseInt(darr[0]) +
        "/" +
        parseInt(darr[1]) +
        "/" +
        parseInt(darr[2]) +
        " " +
        parseInt(marr[0]) +
        ":" +
        parseInt(marr[1]) +
        ":" +
        parseInt(marr[2]);
      return dd;
    },
    addZero(num) {
      return num < 10 ? "0" + num : num;
    },
    formatDateTime(date) {
      var time = new Date(Date.parse(date));
      time.setTime(time.setHours(time.getHours() + 8));
      // time.setTime(time.setHours(time.getHours()));
      var Y = time.getFullYear() + "-";
      var M = this.addZero(time.getMonth() + 1) + "-";
      var D = this.addZero(time.getDate()) + " ";
      var h = this.addZero(time.getHours()) + ":";
      var m = this.addZero(time.getMinutes()) + ":";
      var s = this.addZero(time.getSeconds());
      return Y + M + D + h + m + s;
    }

方法2

function timeChange(time) {
            var date = time.substr(0, 10); //年月日
            var hours = time.substring(11, 13);
            var minutes = time.substring(14, 16);
            var seconds = time.substring(17, 19);
            var timeFlag = date + ' ' + hours + ':' + minutes + ':' + seconds;
            timeFlag = timeFlag.replace(/-/g, "/");
            timeFlag = new Date(timeFlag);
            timeFlag = new Date(timeFlag.getTime() + 8 * 3600 * 1000);
            timeFlag = timeFlag.getFullYear() + '-' + ((timeFlag.getMonth() + 1) < 10 ? "0" + (timeFlag.getMonth() + 1) : (timeFlag.getMonth() + 1)) + '-' + (timeFlag.getDate() < 10 ? "0" + timeFlag.getDate() : timeFlag.getDate()) + ' ' + timeFlag.getHours() + ':' + timeFlag.getMinutes() + ':' + (timeFlag.getSeconds() < 10 ? "0" + timeFlag.getSeconds() : timeFlag.getSeconds());
            return timeFlag;
        };

调用 

timeChange（2020-06-15T07:23:17.000+0000） //2020-06-15 15:23:14