selenium 003 多个窗口之间切换

#coding=utf-8
from selenium import webdriver
import time
driver = webdriver.Firefox()
driver.get("http://www.baidu.com/")

driver.get("https://www.xuexi.cn/98d5ae483720f701144e4dabf99a4a34/5957f69bffab66811b99940516ec8784.html")
s = driver.find_elements("css selector", "word-item")
print(s)
elements = driver.find_elements_by_class_name("word-item")
print(elements)
elements[1].click()
elements[2].click()
elements[3].click()
#获得当前窗口
nowhandle=driver.current_window_handle
#打开注册新窗口
#driver.find_element_by_name("tj_reg").click()
#获得所有窗口
allhandles=driver.window_handles
#循环判断窗口是否为当前窗口
for handle in allhandles:
    driver.switch_to_window(handle)
    time.sleep(6)
    
#回到原先的窗口
#driver.switch_to_window(nowhandle)
time.sleep(3)
print("ooooooooooooooooover")
#driver.quit()