###本文提供的代码只用于学习，请勿用于商业用途

?这次没用正则和BS4，用了XPATH,因为真的好久好久没用xpath了。

唯一要主要克服的难点就是京东的ajax加载，直接requests抓网页只有前30个商品，还要用get请求访问目标url，得到后面的商品。b变量其实是UNIX时间戳。

PS,真的好想买索尼的电视机，因为安卓电视+无开机广告......建议电视机运行内存大于2G，CPU配A73,选择安卓是为后续刷机或者装第三方应用考虑

#coded by 伊玛目的门徒
from bs4 import BeautifulSoup
import requests
# coding: utf-8
from lxml import etree
import pandas as pd
import time

start = time.clock()


header={'user-agent':'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.XXXX.XXX Safari/537.36'}

head={'authority': 'search.jd.com',
    'method': 'GET',
    'path': '/s_new.php?keyword=%E7%94%B5%E8%A7%86%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E7%94%B5%E8%A7%86%E6%9C%BA',


    'scheme':'https',
    'referer': 'https://search.jd.com/Search?keyword=%E7%94%B5%E8%A7%86%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E7%94%B5%E8%A7%86%E6%9C%BA&cid2=653&cid3=655&page=3&s=58&click=0',
    'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36',
    'x-requested-with': 'XMLHttpRequest',
    'Cookie':'pinId=P7U4oU1101vnxG4Eir9OvbV9-x-f3wj7; shshshfpa=3120508e-1db3-33c7-d34d-733fc57f5c61-1527256832; shshshfpb=2b679cd3d88844dc7956f01c306d1e8ea5b0817076f66fb12543702016; qrsc=3; __jdu=2045744036; TrackID=1wgah744lMsZWXTwC-q-Biyu37x7sxp8CseoInLtJZAVBG6zQJux5G9mvMGBhV3T3hMRrtlFHyNDJTPVf9ckESDMKHNDoZr-Wr6ETbyEoNGE; __jdv=122270672|baidu|-|organic|not set|1552825203464; areaId=2; PCSYCityID=2; shshshfp=f1024c8fe38dc72f7cbd01d3e8120c95; xtest=428.cf6b6759; ipLoc-djd=2-2830-51800-0; user-key=859e46c8-d778-4972-8cb6-435b9d3378b6; cn=0; 3AB9D23F7A4B3C9B=J6H7CPQOXRM4BEEC34ESMFZSPDECXYZUVXQW2BOOW2P3QJXJOXSEAMVSMD5DV3NK7MR3DZNGSK2XAS6OUUNRDR532U; __jda=122270672.2045744036.1495102986.1552825203.1552906130.51; __jdc=122270672; rkv=V0500; __jdb=122270672.2.2045744036|51.1552906130; shshshsID=8782cfd99609426bed86f079aa971f79_2_1552906303039'

    }


cookies={'cookies': 'pinId=P7U4oU1101vnxG4Eir9OvbV9-x-f3wj7; shshshfpa=3120508e-1db3-33c7-d34d-733fc57f5c61-1527256832; shshshfpb=2b679cd3d88844dc7956f01c306d1e8ea5b0817076f66fb12543702016; qrsc=3; __jdu=2045744036; TrackID=1wgah744lMsZWXTwC-q-Biyu37x7sxp8CseoInLtJZAVBG6zQJux5G9mvMGBhV3T3hMRrtlFHyNDJTPVf9ckESDMKHNDoZr-Wr6ETbyEoNGE; __jda=122270672.2045744036.1495102986.1541941006.1552825203.50; __jdc=122270672; __jdv=122270672|baidu|-|organic|not set|1552825203464; areaId=2; PCSYCityID=2; shshshfp=f1024c8fe38dc72f7cbd01d3e8120c95; xtest=428.cf6b6759; rkv=V0500; 3AB9D23F7A4B3C9B=J6H7CPQOXRM4BEEC34ESMFZSPDECXYZUVXQW2BOOW2P3QJXJOXSEAMVSMD5DV3NK7MR3DZNGSK2XAS6OUUNRDR532U; ipLoc-djd=2-2830-51800-0; __jdb=122270672.4.2045744036|50.1552825203; shshshsID=99df96dc146b5071a6934e385d2d7f33_4_1552826030047'}

name=[]
p=[]





def frontpage(n):
    url='https://search.jd.com/Search?keyword=电视机&enc=utf-8&qrst=1&rt=1&stop=1&page='+str(2*n-1)
    #html=requests.get(url,headers=header,cookies=cookies)
    html=requests.get(url,headers=head)
    html.encoding = 'utf-8'



    selector = etree.HTML(html.text)
    goods_name = selector.xpath('//div/a/em/text()[1]')
    for i in goods_name:
        print (i)
        name.append(i)


    price = selector.xpath('//div/strong/i')
    for i in price:
        print (i.text)
        p.append(i.text)


    print (len(goods_name))
    print (len(price))

    x1=selector.xpath('//li[19]/div/div[2]/strong/i')


    print ('###############################################')



def backpage(n):
    a=time.time()
    b='%.5f'%a


    url_last='https://search.jd.com/s_new.php?keyword=%E7%94%B5%E8%A7%86%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&wq=%E6%89%8B%E6%9C%BA&page='+str(2*n)+'&s='+str(48*n-20)+'&scrolling=y&log_id='+str(b)
  
    url_test='https://search.jd.com/s_new.php?keyword=%E7%94%B5%E8%A7%86%E6%9C%BA&enc=utf-8&qrst=1&rt=1&stop=1&vt=2&page='+str(2*n)+'&s='+str(48*n-20)+'&scrolling=y&log_id='+str(b)
    html2=requests.get(url_test,headers=head)
    html2.encoding = 'utf-8'
  

    selector = etree.HTML(html2.text)
    goods_name = selector.xpath('//div/a/em/text()[1]')
    for i in goods_name:
        print (i)
        name.append(i)

    print (len(goods_name))


    price = selector.xpath('//div/strong/i')
    for i in price:
        print (i.text)
        p.append(i.text)

    print (len(price))
    print ('###############################################')


for n in range(1,10):
    try:
        frontpage(n)


    except Exception as e:
        print(e)
        print ('fail')
        print (2*n-1)
    try:
        backpage(n)

    except Exception as e:
        print(e)
        print ('fail')
        print (2*n)





df=pd.DataFrame({
    'goods_name':name,
    'price':p
})
print (df)

end = time.clock()
print ('用时: %f '%(end-start))

print('################保存csv####################')
df.to_csv('京东电视机.csv')

爬虫结果：

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视频演示：

https://www.bilibili.com/video/av46769501/

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还有一个我借鉴别人的chrome模拟访问方式（selenium）以实现ajax加载，但有一说一，真的很慢，建议多线程

# -*- coding: utf-8 -*-
from selenium import webdriver
from bs4 import BeautifulSoup
import time
print ('yes')
driver = webdriver.Chrome()
#s1='%E8%A3%A4%E5%AD%90'
s1='%E7%94%B5%E8%A7%86'
url='https://search.jd.com/Search?keyword='+s1+'&enc=utf-8&page=1'
driver.get(url)
print (driver.current_url)
t1 = time.time()
n = 10   #这里可以控制网页滚动距离
for i in range(1,n+1):
    s = "window.scrollTo(0,document.body.scrollHeight/{0}*{1});".format(5,i)
    print (s, len(driver.page_source),time.time()-t1)
    driver.execute_script(s)
    time.sleep(0.5)

lis=driver.find_elements_by_class_name("gl-item")
for i in range(len(lis)):
    print (lis[i].find_element_by_class_name("p-name").text)
    print (lis[i].find_element_by_class_name("p-price").text)
#    print lis[i].text

driver.quit()
print ("end")

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