为什么不能获取所有的数据啊，就返回了第一页的数据

import scrapy
import re

class AppSpider(scrapy.Spider):
    name = "app"
    allowed_domains = ["search.jd.com"]
    start_urls = ["https://list.jd.com/list.html?cat=1123713%2C3258&page=1&s=1&click=0"]

    def parse(self, response):
        lis = response.xpath('//*[@id="J_goodsList"]/ul/li')
        if len(lis) != 0:
            for i in lis:
                title = i.xpath('.//div/div[3]/a/em/text()').get()
                price = i.xpath('.//div/div[2]/strong/i/text()').get()
                print(title, price)

            exp = re.compile('page=(\d*?)&s=(\d*?)&')
            result = exp.findall(response.url)[0]
            page = str(int(result[0])+1)
            s = str(int(result[1])+38)
            next_url = f"https://list.jd.com/list.html?cat=1123713%2C3258&page={page}&s={s}&click=0"
            print(next_url)
            yield scrapy.Request(url=next_url, callback=self.parse)