#备注以下小段代码描述了页面变化规律，这个得自己去研究
if not has_pre_page:   #点击第2页时会出现上一页，页号加1
has_pre_page = True
page_num = page_num + 1
if page_num % 7 == 0: #page_num等于7时，页号减1
page_num = page_num - 1
time.sleep(2)
driver.execute_script(js)
time.sleep(2)
time.sleep(3)
driver.quit()
　　改进版(自动翻页，前翻页后翻页)
# -*- coding: utf-8 -*-
from selenium import webdriver
import time
if __name__ == "__main__":
driver = webdriver.Firefox()
driver.maximize_window()
driver.get('http://www.baidu.com')
driver.implicitly_wait(5)
driver.find_element_by_id('kw1').send_keys('selenium selenium')#测试数据 selenium zhidashso dld#selenium zhidashso dldld
driver.find_element_by_id('su1').click()
js = 'document.documentElement.scrollTop=10000'
total = 0  #页面数
is_next_page = True  #存在下一页
page_num = 0   #要点击的页面号
#往后翻页
while is_next_page:#'sv_page=1' in one_page.get_attribute('href')
driver.execute_script(js)
page_num = page_num + 1    #设置页号为下一页
total = page_num   #记录页面数
value=str(page_num)
try:
#查找指定页面
one_page = driver.find_element_by_css_selector('p[id="page"]>a[href*=pn='+value+']')
one_page.click()
time.sleep(1)
driver.execute_script(js)
time.sleep(1)
except:
print('no next page')
is_next_page = False
total = total - 1
break
#往前翻页
while total >= 0:
driver.execute_script(js)
try:
total = total -1
value = str(total)
one_page = driver.find_element_by_css_selector('p[id="page"]>a[href*=pn='+value+']')
one_page.click()
time.sleep(1)
driver.execute_script(js)
time.sleep(1)
except:
print('no pre page')
break;
time.sleep(3)
driver.quit()