element 树节点的选择（带父节点id）（回显时父子不关联，选中时关联）

         <el-tree
            :data="SQData"
            show-checkbox
            default-expand-all
            node-key="id"
            ref="tree"
            highlight-current
            :props="defaultProps"
            @check-change="checkChange"
          >
          </el-tree>

data(){
  return{
      SQData: [],
      defaultProps: {
        children: 'children',
        label: 'label',
      },
  }
}
methods:{
    checkChange(node, bool, child) {
    // 选择的时候，父子关联
      this.checkStrictly = false
      if (bool) {
        this.nodeChecked = [...this.nodeChecked, node.id]
      } else {
        this.nodeChecked = this.nodeChecked.filter((item) => item !== node.id)
      }
      // 获取父选中元素
      let hafCheckedKeys = this.$refs.tree.getHalfCheckedKeys();
      // 合并选中
      this.nodeChecked = this.nodeChecked.concat(hafCheckedKeys)
      let arr = this.nodeChecked
      function unique(arr) {
        return Array.from(new Set(arr))

      }
      this.nodeChecked = unique(arr)
      console.log(this.nodeChecked, 123456);
    },}