The front end converts the list into a tree structure

Requirement: Convert the collection passed in the background into the tree structure required by the component.
The result is as follows:

Specific conversion:

<el-form-item label="xxxxx" prop="xx">
         <el-tree-select
           node-key="label"
           v-model="from.xxId"
           :data="treedData"
           :props="defaultProps"
           :render-after-expand="false"
         />
</el-form-item>
const treedData = ref([])
const defaultProps = {
  children: 'children',
  label: 'label'
}
async function getXxxInfo() {
  const data = await xxApi.geXxxInfo(params)
  console.log(data.list)
  let obj = {}
  data.list.forEach((item) => {
    if (obj.hasOwnProperty(item['xx'])) {
      obj[item['xx']].push({ ...item, label: item.ebankId })
    } else {
      obj[item['xx']] = []
      obj[item['xx']].push({ ...item, label: item.ebankId })
    }
  })

  for (let x in obj) {
    treedData.value.push({ label: x, children: obj[x] })
  }
}

getXxxInfo()

Record it. If you have other better methods, you can post them. I _{have been too busy recently. I took the time to record it. You can refer to it if you need it.}