The element tree list selects the child and parent nodes at the same time and the realization of echo

First call the tree control in element:

  <el-tree
                  :data="dataTree"
                  ref="tree"
                  :props="props"
                  accordion
                  show-checkbox
                  node-key="id"
                  updateKeyChildren=""
                  @check-change="handleCheckChange"
                >
                </el-tree>

Then use the @check-change event to get the callback when the selected state of the node changes

    // 树形方法_复选框
    handleCheckChange(data) {
    
    
      console.log(data)
      debugger;
      // 选中当前子节点以及父节点
      let res = this.$refs.tree.getCheckedKeys().concat(this.$refs.tree.getHalfCheckedKeys())
      console.log(res)
    }

The res returns here are the child nodes you click and the callback when the parent node changes.

The realization of echo
first give a button

    <el-button
                    type="text"
                    size="small"
                    @click="updateHandle(scope.row)"
                  >

Get the content of this row through scope.row, and then get the permission id you already have

  updateHandle(data) {
    
    
      console.log(data);
      // window.location.reload()
      if (data.menuIds) {
    
    
        var tempArr = data.menuIds.split(",");  //用,分割
        this.defaultCheck = tempArr;			//创建一个空数组来接受tempArr
        this.$refs.tree.setCheckedKeys(this.defaultCheck)    	//实现回显
        // this.defaultCheck = Object.assign([], this.defaultCheck, tempArr);
      }
    },