Javascript 接收数据的转换

const input = [{
    "channel_number": 1,
    "id_channel": "св-1312",
    "consumption": 1231,
    "date": 01
  },
  {
    "channel_number": 1,
    "id_channel": "св-1312",
    "consumption": 1234,
    "date": 02
  },
  {
    "channel_number": 1,
    "id_channel": "св-1312",
    "consumption": 1234,
    "date": 03
  },
  {
    "channel_number": 2,
    "id_channel": "св-1314",
    "consumption": 800,
    "date": 01
  },
  {
    "channel_number": 2,
    "id_channel": "св-1314",
    "consumption": 823,
    "date": 02
  },
  {
    "channel_number": 2,
    "id_channel": "св-1314",
    "consumption": 1233,
    "date": 03
  }
];

const output = input.reduce((acc, item) => {
  // 1. You check whether the accumulator already contains an object
  //    with the same date of the item you are currently considering
  let accItem = acc.find(_item => _item.date === item.date);

  if (accItem) {
    // 2a. if it does, you update that object by pushing into the `channels` array
    //     the data from your item
    accItem.channels.push({
      channel_number: item.channel_number,
      consumption: item.consumption
    });
  } else {
    // 2b. if it does NOT, you create a new object from the item
    //     and you push it into the accumulator
    acc.push({
      date: item.date,
      channels: [{
        channel_number: item.channel_number,
        consumption: item.consumption
      }]
    })
  }
  
  // 3. finally you return the updater accumulator and repeat point 1 and 2
  //    for the following item in your input array
  return acc
}, []);

console.log(output);

const input = [{
    "channel_number": 1,
    "id_channel": "св-1312",
    "consumption": 1231,
    "date": 01
  },
  {
    "channel_number": 1,
    "id_channel": "св-1312",
    "consumption": 1234,
    "date": 02
  },
  {
    "channel_number": 1,
    "id_channel": "св-1312",
    "consumption": 1234,
    "date": 03
  },
  {
    "channel_number": 2,
    "id_channel": "св-1314",
    "consumption": 800,
    "date": 01
  },
  {
    "channel_number": 2,
    "id_channel": "св-1314",
    "consumption": 823,
    "date": 02
  },
  {
    "channel_number": 2,
    "id_channel": "св-1314",
    "consumption": 1233,
    "date": 03
  }
];

const tempObj = input.reduce((obj, item) => {
  if (obj[item.date]) {
    obj[item.date].channels.push({
      channel_number: item.channel_number,
      consumption: item.consumption
    });
  } else {
    obj[item.date] = {
      date: item.date,
      channels: [{
        channel_number: item.channel_number,
        consumption: item.consumption
      }]
    }
  }

  return obj;
}, {});

const output = Object.values(tempObj);

console.log(output);