<FormItem label="计时：" prop="jishi">
              <Input v-model="formItem.jishi"  @on-keydown="jishi" placeholder="请输入计时"></Input>
            </FormItem>

jishi: [
            {
              required: true,
              message: '请输入计时'
            },
            {
              type:'number',
              message:'输入的类型为数字',
              transform(value) {
                return Number(value);
              }
            }
          ],