tree - 事件

<el-tree

                class="vpTitleTree"

                :data="data"

                :props="props"

                show-checkbox

                node-key="yhid"

                :default-expanded-keys="index"

                @check-change="checkChange"

                >

                </el-tree>

    callersChange(checkedNodes, isChange) {
      // console.log("1------>", checkedNodes, isChange);
    },
    checkChange(data, isSelect) {
      let arr = this.form.cdidList;
      if (isSelect) {
        arr.push(data.id);
        console.log("添加的数组", arr);
      } else {
        let i = arr.findIndex(x => {
          return x == data.id;
        });
        arr.splice(i, 1);
        console.log(arr, "---");
      }
      this.form.cdidList = arr;
      // console.log("2------>", data, isSelect);
    }

第二种：直接获取，没有判断是 添加还是 删除

<el-tree
        :data="data"
        :props="defaultProps"
        @node-click="handleNodeClick"
      ></el-tree>


handleNodeClick(data) {
      console.log(data);
    }

第三种利用 ref

_this.formline.addcheckval = _this.$refs.tree.getCheckedKeys()
// 获取到最后的元素的值



$refs.tree.getCheckedNodes()   // 获取元素 row 的所有值

      console.log(checkedKeys.checkedKeys, "将所有打印出来的id，拼成一个数组，好用"); 

<el-tree
          :data="roledata"
          show-checkbox
          node-key="code"
          ref="tree"
          highlight-current
          @check="treeChange"
          :props="{
            children: 'childen',
            label: 'value',
          }"
        >
        </el-tree>



// tree 的 change 事件
    treeChange(checkedNodes, checkedKeys, halfCheckedNodes, halfCheckedKeys) {
      console.log(checkedKeys.checkedKeys, "将所有打印出来的id，拼成一个数组，好用");

      let qhbmName = new Array();
      // 点击了全部
      if (this.$refs.tree.getCheckedNodes().length > 2) {
        this.$refs.tree.setCheckedKeys([]);
        this.$message.error("最多可选择一个");
        return;
      }
      // 设置单选
      this.$refs.tree.setCheckedKeys([]);
      let pitchOn = checkedNodes.code.split(",");
      this.$refs.tree.setCheckedKeys(pitchOn);
      // 数据处理
      this.$refs.tree.getCheckedNodes().forEach((item) => {
        qhbmName.push(item.value);
      });
      this.formInline.qhbmCode = this.$refs.tree.getCheckedKeys().join(",");
      this.formInline.qhbmName = qhbmName.join(",");
    },