每次下拉浏览器界面的document.body.scrollHeight参数都会发生变化，selenium拉到最底部时该参数将不会改变，以此来判断是否到了最底部，方法如下：

def pulldown():
    t = True
    i = 1
    while t:
        check_height = browser.execute_script("return document.body.scrollHeight;")
        for r in range(20):
            t = random.uniform(1, 2)
            time.sleep(t)
            browser.execute_script("window.scrollBy(0,1000)")
            print('第%s页' % str(i))
            i += 1
        check_height1 = browser.execute_script("return document.body.scrollHeight;")
        print(str(check_height)+'**************'+str(check_height1))
        if check_height == check_height1:
            t = False
pulldown()
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selenium python3 代码如下：

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
import time
import random
path = r'E:\chromedriver.exe'
chrome_options = Options() #创建配置对象
chrome_options.add_argument('--headless')
chrome_options.add_argument('--disable-gpu')
chrome_options.add_argument("user-agent='Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36'")
browser = webdriver.Chrome(executable_path=path,chrome_options=chrome_options)
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