开始编写代码之前你应了解ajax 和python基础语法和库，知道异步加载！熟悉html，js。本人ide用的是vscode，浏览器是chrome，python3.7，主要用到了selenium自动化测试工具。

一：先看效果：（这里以“手机”为例，为了简单起见，也为了提高运行速度就不加载照片了，只爬取商品描述信息，而且不加载照片）

……海量的数据，未完……

二：引用的库

from selenium import webdriver

from selenium.webdriver.common.keys import Keys

from selenium.webdriver.common.by import By

from selenium.webdriver.support.wait import WebDriverWait

from selenium.webdriver.support import expected_conditions as EC

from pyquery import PyQuery as pq

完整代码如下：
 

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from pyquery import PyQuery as pq
from bs4 import BeautifulSoup
import time
url = "https://www.jd.com"
# 生成对象
driver = webdriver.Chrome()
options =  webdriver.ChromeOptions()
options.add_experimental_option('prefs', {'profile.managed_default_content_settings.images': 2})
def splider():
    """入口"""
    # 请求主页
    driver.get(url)
    keys = '手机'
    driver.find_element_by_id("key").send_keys(keys)
    driver.find_element_by_id("key").send_keys(Keys.ENTER)
    WebDriverWait(driver, 1000).until(
        EC.presence_of_all_elements_located(
            (By.CLASS_NAME, 'gl-item')
        )
    )
    # 先获取一个有多少页
    all_page = eval(driver.find_element_by_css_selector('span.p-skip em b').text)
    # 设置一个计数器(记录当前页数))
    count = 0
    # 无限循环
    while True:
        try:
            count+=1
            # 等待
            WebDriverWait(driver, 1000).until(
                EC.presence_of_all_elements_located(
                    (By.CLASS_NAME, 'gl-item')
                )
            )
            #   等待
            time.sleep(2)
            #   模拟滚动条下滑
            start = 10
            js = "window.scrollTo(0,{num})"
            while start < 20000:
                try:
                    # print(start)
                    driver.execute_script(js.format(num = str(start)))
                    start += 100
                except Exception as e:
                    break
                #
            html = driver.page_source
            # print(html)
            doc = pq(html)
            #print(type(doc))
            #获取dom
            items_ = doc('.gl-item a em').items()
            for i in items_:
                # regx = '<em>(.*?)<font class="skcolor_ljg">(.*?)<font class="skcolor_ljg">(.*?)</font>(.*?)</em>'
                print(i.text())
        except Exception as e:
            continue
           # 如果count==all_page就退出循环
        if count == all_page:
            break
        # 找到下一页的元素pn-next
        fp_next = driver.find_element_by_css_selector('a.pn-next')
        # 点击下一页
        fp_next.click()
def main():
    splider()
            

if __name__ == '__main__':
    try:
        main()
    except Exception as e:
        print("入口异常{error}".format(error = str(e)))

 三：总结

后续会有分析数据处理数据的（统计图，词云 ），敬请期待哦！！