elementui form表单动态验证必填

在单个el-form-item根据条件判断是否必填

 <el-form-item
            label="设备"
            prop="recordingMeterId"
            :rules="requiredFlag? { required: true, message: '设备不能为空' } : {}"
          >
            <el-select
              v-model="newForm.recordingMeterId"
              clearable
              style="width: 240px"
            >
              <el-option
                v-for="item in recordernOptions"
                :value="item.id"
                :label="item.name"
                :key="item.id"
              >
              </el-option>
            </el-select>

          </el-form-item>