el-select遍历方法，在el-select中有个@change，如@change=“pickRoleName”

          <el-select
            @change="pickRoleName"
            v-model="ToviewForm.deptId"
            placeholder="请选择"
            class="optionsone"
            clearable
          >
            <el-option
              v-for="item in optionsone" // optionsone数组
              :key="item.id"
              :label="item.deptName"
              :value="item.id"  //拿到optionsone中的id
            ></el-option>
          </el-select>

js中调用@change="pickRoleName"方法

    pickRoleName(e) {
      this.optionsone.map((item, i) => {
        if (item.id == e) {
          this.ToviewForm.deptName = item.deptName; //传值
          this.ToviewForm.deptId = item.id;//传值
       
        }
      });
    },