Detailed explanation of vue-element Tree Tree controls to fill the pits

<el-form-item label="Role Permissions:">
 <el-tree :data="data2" 
  show-checkbox 
  node-key="id" 
  @check="handleNodeClick" 
  :default-expanded-keys="[]" 
  ref="tree" 
  :default-checked-keys="default_select" 
  :props="defaultProps">
 </el-tree>
</el-form-item>

data() {
  return {
   data2: [],
   defaultProps: {
    children: 'child',
    label: 'name'
   },
   menu_ids: [],
   // Select by default   default_select: [],
   role_id: 0,
  }
 },
 methods: {
  /**
    * Get details
    */
  getDetail() {
   let that = this;
   that.$(.api_url + "/Role/show_edit", {
    token: ,
    role_id: that.role_id
   }, {
    emulateJSON: true
   }).then(
    function (res) {
     var data = ;
     if (data) {
       = ;
       = ;
       = ();
      
      
      /**Focus start*/
      if(typeof (data.menu_id) == 'object'){
       //Return to array       data.menu_id = (data.menu_id).map(key=> data.menu_id[key]);
      }
      //Assignment      data.menu_id.forEach((value)=>{
       that.default_select.push(value);
      });

      setTimeout(function () {
       that.default_select.forEach((value)=>{
        that.$(value,true,false)
       });
      },100);
      that.menu_ids = data.menu_id;
      /**The key end*/
     }
    });
  },

  /**
    * Attribute control
    */
  handleNodeClick(e, data) {
   (data);
   (e);
   this.menu_ids = 
  },
 }