问题

希望能把当前的数组，根据相同的【日期】，放在一个数组里面；

let sourceData=[
        {date:"2021-01-01",name:"LuckyJin"},
        {date:"2021-01-01",name:"JinFed"},
        {date:"2021-02-01",name:"olivivian"}
    ]

  var dataTemp = []
  var newData = []
  sourceData.forEach( item =>{
    dataTemp[item.date] = dataTemp[item.date] || [];
    dataTemp[item.date].push(item);
  })
  console.log('格式一',dataTemp)

效果：

image.png

  for (let key in dataTemp ) {
    let obj = {}
    obj.date = key
    obj.list = dataTemp[key]
    newData.push(obj)
  }
  console.log('格式二',newData);

效果：

image.png