最近用到数组，捣鼓了好久，终于是自己想要的效果了

首先先循环遍历data中的数组，取到我要的时间年月

 richengList:[
        {id: 0, name: '你有一个会议', region: '2019-12-11'},
        {id: 1, name: '你你有一个会议', region: '2019-12-13'},
        {id: 2, name: '后天有一个会议', region: '2019-12-15'},
        {id: 3, name: '后天有一个会议', region: '2019-12-15'},
        {id: 4, name: '后天有一个会议', region: '2019-12-15'}
      ]

 for(var item of richengList){
        //console.log(item)
        var riqi = item.region;
        riqi = riqi.split('-');
        console.log(riqi);
        }

效果图：

接下来是把每个循环的数组加到对应的数组

       var riqiYear = riqi[0];
        richengYear += riqiYear +",";
        //console.log(riqiYear);
        var riqiMonth = riqi[1];
        richengMonth += riqiMonth +",";
        var riqiDay = riqi[2];
        richengDay +=riqiDay +",";
        console.log(richengDay);

效果：

因为是再for循环里输出，所以会叠加输出五次
最后进行解析，就是想要的数组了：

     richengYear = richengYear.substring(0, richengYear.length - 1);
      this.richengYear = richengYear.split(",");
      console.log(this.richengYear);
      richengMonth = richengMonth.substring(0, richengMonth.length - 1);
      this.richengMonth = richengMonth.split(",");
      console.log(this.richengMonth);
      richengDay = richengDay.substring(0, richengDay.length - 1);
      this.richengDay = richengDay.split(",");

效果图：

完整代码：

 queryRicheng() {
      var richengList = this.richengList;
      var richengYear = "";
      var richengMonth = "";
      var richengDay = "";
      // this.richengList.forEach(function (e) {
      // })
      for (var item of richengList) {
        //console.log(item)
        var riqi = item.region;
        // console.log(riqi)
        riqi = riqi.split("-");
        console.log(riqi);
        var riqiYear = riqi[0];
        richengYear += riqiYear + ",";
        //console.log(riqiYear)
        var riqiMonth = riqi[1];
        richengMonth += riqiMonth + ",";
        var riqiDay = riqi[2];
        richengDay += riqiDay + ",";
        console.log(richengDay);
      }
      richengYear = richengYear.substring(0, richengYear.length - 1);
      this.richengYear = richengYear.split(",");
      console.log(this.richengYear);
      richengMonth = richengMonth.substring(0, richengMonth.length - 1);
      this.richengMonth = richengMonth.split(",");
      console.log(this.richengMonth);
      richengDay = richengDay.substring(0, richengDay.length - 1);
      this.richengDay = richengDay.split(",");
      console.log(this.richengDay);
      console.log(this.nowDate.year);
    },

可能会有点麻烦，这样去截取，有更好的办法的欢迎评论指导，新手小白，还没毕业（可爱的我）
如果对你有帮助点个赞哟(＾Ｕ＾）