el-tree

 :data //树的数据

 default-expand-all

     <el-tree
        class="iip-addressbook__departtree"
        :data="dataList"
        default-expand-all
        node-key="id"
        ref="addressDepartTree"
        highlight-current
        :expand-on-click-node="false"
        :props="defaultProps"
        @node-click="handleNodeClick"
        @node-contextmenu="contextMeunClick">
      </el-tree>