将一维数组处理成树形结构数据

list是个一维数组数据，每项数据中有id和pid，id是自己的唯一标识符，pid是自己父级的id。

function(list){
    let dealOptions = []
    // 给每个数据加children属性
    _.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
}