El-tree sets a node in the directory tree to be highlighted

this.$refs.viewTree.setCurrentKey(node_id); //"viewTree" is your own ref="viewTree set on the tree control "

<el-tree
        Ref="viewTree"
        :default-expanded-keys="['Control', 'Template']"
        Node-key="id"
        :highlight-current="highlight_current"
        :data="tree_data"
        Class="tree"
        :props="defaultProps"
        @node-click="handleNodeClick"
        Style='margin-bottom: 20px'
        >
        </el-tree>
<script >
    Export default{
        Data(){
            Return {
                Tree_data: [{
                Id: 'l1_1',
                Label: 'Level 1 ',
                Children: [{
                  Label: 'node 1-1',
                  Id: 'l1_1_1',
                }, {
                  Label: 'node 1-2',
                  Id: 'l1_1_2',
                }, {
                  
                  Label: 'node 1-3',
                  Id: 'l1_1_3',
                }]
              }, {
                Label: 'level node 2',
                Id: 'l1_2',
                Children: [{
                  Label: 'node 2-1',
                  Id: 'l1_2_1',
                }]
              }],
            }
        }
    }
</script>

node_id can be the id of any node in tree_data