element ui tree树形控件加提示信息

            <el-tree :data="tieLinedata" :props="defaultProps" @node-click="handleNodeClick">
              <span class="span-ellipsis" slot-scope="{ node, data }">
                    <span :title="node.label">{{ node.label }}</span>
                  </span>
            </el-tree>

.span-ellipsis {
  width: 100%;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  display: block;
}