一、效果展示：

• 展示可选层级

• 查看选中的值 

二、实现：

 

<el-form-item label="相关科室:" prop="orgId">
  <el-cascader
    popper-class="cascader-my"
    :options="orgOptions"
    :show-all-levels="false"
    v-model="orgList"
    :props="props"
    @change="changeOrg"
    collapse-tags
    placeholder="请选择"
    filterable
  ></el-cascader>
</el-form-item>

//-------------相关变量定义-------------
rgOptions: [],
orgList: [], // 选中的科室数据
props: {
    children: 'childList',
    label: 'orgName',
    value: 'orgId',
    multiple: true,
    emitPath: false,
    expandTrigger: 'hover'
  }  

//-------------相关方法--------------

 // 初始化科室
    initOrgInfo() {
      xxx().then((res) => {
        if (res.code === 200) {
          this.orgOptions = res.result
        } else {
          this.$message.error(res.message)
        }
      })
    },

    // 科室选中
    changeOrg(val) {
      if (val && val.length > 0) {
        const orgArr = this.findOrgIdInNestedList(val, this.orgOptions)
        this.form.orgId = orgArr.join() || ''
      }
    },

    // 科室无限层级迭代
    findOrgIdInNestedList(targetIds, orgOptions) {
      const deptData = []
      function searchOrg(options, targetId) {
        options.forEach((org) => {
          if (org.orgId === targetId) {
            deptData.push(org.orgId)
          } else if (org.childList && org.childList.length > 0) {
            searchOrg(org.childList, targetId)
          }
        })
      }
      targetIds.forEach((i) => {
        searchOrg(orgOptions, i)
      })
      return deptData
    },