<el-tree ref="tree" :data="data" :props="defaultProps" @node-click="handleNodeClick"></el-tree>
  <script>
  import { throttle } from 'lodash'
  export default {
    data() {
      return {
        data: [
          {
            label: '一级 1',
            value: '1',
            children: [{
              label: '二级 1-1',
              value: '1-1',
              children: [{
                label: '三级 1-1-1',
                value: '1-1-1'
              }]
            }]
          }, {
            label: '一级 2',
            value: '1-2',
            children: [{
              label: '二级 2-1',
              value: '2-1',
              children: [{
                label: '三级 2-1-1',
                value: '2-1-1'
              }]
            }, {
              label: '二级 2-2',
              value: '2-2',
              children: [{
                label: '三级 2-2-1',
                value: '2-1-1'
              }]
            }]
          }, {
            label: '一级 3',
            value: '3',
            children: [{
              label: '二级 3-1',
              value: '3-1',
              children: [{
                label: '三级 3-1-1',
                value: '3-1-1'
              }]
            }, {
              label: '二级 3-2',
              value: '3-2',
              children: [{
                label: '三级 3-2-1',
                value: '3-2-1'
              }]
            }]
          }],
        defaultProps: {
          children: 'children',
          label: 'label'
        }
      }
    },
    methods: {
 
      handleNodeClick(data, node) {
        // console.log("data是多少呢");
        // console.log(node);
        // let selectedNode = this.$refs.tree.getNode(node);
        this.breadList =[]
        this.platform(node);
        console.log("value是多少呢");
        console.log(this.breadList);
      },
      // 递归函数
      platform(node) {
        if (!node.parent) {// 若无父节点，则直接返回
          return
        }
        this.breadList.unshift(node.data.value)// 将value保存起来
        //调用递归
        this.platform(node.parent)
      },
    }

</script>

点击第三级打印结果如下：