按键将对象分组为二维数组

let obj={"00:00" :[{"id":1,time:"00:05"},{"id":1,time:"00:15"},{"id":1,time:"00:20"},{"id":2,time:"00:05"},{"id":3,time:"00:05"},{"id":4,time:"00:35"}],"02:00" :[{"id":1,time:"00:05"},{"id":1,time:"00:15"},{"id":1,time:"00:20"},{"id":2,time:"00:05"},{"id":3,time:"00:05"},{"id":4,time:"00:35"}]}

var result = Object.entries(obj).reduce((c, v) => {
  c[v[0]] = Object.values(v[1].reduce((a, o) => {
    a[o.time] = a[o.time] || [];
    a[o.time].push(o);
    return a;
  }, {}));
  return c;
}, {});


console.log(result);