from selenium import webdriver
import  time


driver=webdriver.Chrome()
driver.get("http://www.douban.com/")

driver.find_element_by_xpath(‘//*[@id="anony-sns"]/div/div[3]/div/div[1]/ul/li[1]/div/a/img‘).click()
time.sleep(3)
driver.back()  #后退
time.sleep(3)
driver.forward()  #前进