將一維數組處理成樹形結構數據

list是個一維數組數據，每項數據中有id和pid，id是自己的唯一標識符，pid是自己父級的id。

function(list){
    let dealOptions = []
    // 給每個數據加children屬性
    _.forEach(list, one => {
      one.children = []
    })
    _.forEach(list, one => {
      let findIndex = _.findIndex(list, item => {
        return item.id === one.pid
      })
      if ((!one.pid && one.pid !== 0 && one.pid !== false) || findIndex === -1) {
        dealOptions.push(one)
      } else {
        list[findIndex].children.push(one)
      }
    })
    return dealOptions
}