[ {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;
}
