提取时间参数

[ {id: 1,time: '2020-3-25'}, {id: 2,time: '2020-3-25'}, {id:3,time:'2020-3-26'} ]

转换成 {'2020-3-25':[{id: 1,time: '2020-3-25'},{id: 2,time: '2020-3-25'}], '2020-3-26':[{id:3,time:'2020-3-26'}]}

    process(arr) {
         var b = {};
          arr.forEach( (obj) => {
          var array = b[obj['time']] || [];
          array.push(obj);
          b[obj['time']] = array;
        });
        console.log(b)
        return b;
      }