elementui tree控件 设置默认选中并高亮第一行

 注意：一定要写上this.$nextTick   否则不生效

　　　　　　<el-tree

              ref="treeRef"

              :highlight-current="true"

              default-expand-all

              :data="architectureData"

              node-key="id"

              :current-node-key="currentNodekey"

              :props="defaultProps"

              @node-click="handleNodeClick"

            ></el-tree>

currentNodekey: "", //默认选中的节点树


async treeByDept() {
      await treeByDept({}).then((res) => {
        this.architectureData = res.data;
      
        if (this.architectureData.length > 0) {
          this.currentNodekey = this.architectureData[0].id;
          this.$nextTick(() => {
            this.$refs.treeRef.setCurrentKey(this.currentNodekey); //一定要加这个选中了否则样式没有出来
           });
          
        }
      });
    },

/* 点击树结构项的选中颜色 */

.el-tree--highlight-current .is-current.el-tree-node > .el-tree-node__content {

  background-color: #99ccff !important;

}