<el-select v-model="form.personId"
                     style="width:100%"
                     filterable
                     :disabled="xmDisabled"
                     @change="changeXm($event)"
                     placeholder="请先选择部门">
            <el-option v-for="item in personList"
                       :key="item.userId"
                       :label="item.xm"
                       :value="item.userId">
            </el-option>
          </el-select> 


changeXm (val) {
      console.log('val----', val);
      const selectedItem = this.personList.find(item => item.userId === val);
      // this.form.personId = selectedItem.userId
      this.form.personName = selectedItem.xm
 },

selectedItem为选中的对象

 <el-select v-model="select" slot="prepend" placeholder="请选择" @change="search($event)">

          <el-option

            :label="item.ziDianShuJu"

            :value="{value:item.id, label:item.ziDianShuJu}"

            v-for="item in dictionAry" :key="item.id">

          </el-option>

        </el-select>

search(e){
      console.log(e)
 },