【elementUI】el-tree搜索时加载子节点对应父节点、父节点对应子节点树

<el-input
  placeholder="输入关键字进行过滤"
  v-model="filterText">
</el-input>
<el-tree
  class="filter-tree"
  :data="data2"
  :props="defaultProps"
  default-expand-all
  :filter-node-method="filterNode"
  ref="tree2">
</el-tree>
<script>
  export default {
    watch: {
      filterText(val) {
        this.$refs.tree2.filter(val);
      }
    },
    methods: {
      filterNode(value, data) {
        if (!value) return true;
        return data.label.indexOf(value) !== -1;
      }
    },
    data() {
      return {
        filterText: '',
        data2: [{
          id: 1,
          label: '一级 1',
          children: [{
            id: 4,
            label: '二级 1-1',
            children: [{
              id: 9,
              label: '三级 1-1-1'
            }, {
              id: 10,
              label: '三级 1-1-2'
            }]
          }]
        }, {
          id: 2,
          label: '一级 2',
          children: [{
            id: 5,
            label: '二级 2-1'
          }, {
            id: 6,
            label: '二级 2-2'
          }]
        }, {
          id: 3,
          label: '一级 3',
          children: [{
            id: 7,
            label: '二级 3-1'
          }, {
            id: 8,
            label: '二级 3-2'
          }]
        }],
        defaultProps: {
          children: 'children',
          label: 'label'
        }
      };
    }
  };
</script>

filterNode(value,data,node) {
  if(!value){
    return true;
  }
  let level = node.level;
  let _array = [];//这里使用数组存储 只是为了存储值。
  this.getReturnNode(node,_array,value);
  let result = false;
    _array.forEach((item)=>{
    result = result || item;
    });
    return result;
},
getReturnNode(node,_array,value){
  let isPass = node.data &&  node.data.label && node.data.label.indexOf(value) !== -1;
  isPass?_array.push(isPass):'';
  this.index++;
  console.log(this.index)
  if(!isPass && node.level!=1 && node.parent){
    this.getReturnNode(node.parent,_array,value);
  }
},