python selenium–操作滚动条

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from selenium import webdriver  
from selenium.webdriver.common.keys import Keys  
from selenium.webdriver.common.action_chains import ActionChains  
import time  

driver = webdriver.Firefox()  
driver.get('https://www.baidu.com')  
driver.maximize_window()  
driver.find_element_by_id('kw').send_keys('python')  
driver.find_element_by_id('su').click()  
time.sleep(5)  
# first method  
# js = "window.scrollTo(0,document.body.scrollHeight)"  
# driver.execute_script(js)  
# time.sleep(3)  
# js = "window.scrollTo(0,0)"  
# driver.execute_script(js)  

# second  
# js = "var q=document.documentElement.scrollTop=10000"  
# driver.execute_script(js)  
# time.sleep(3)  
# js = "var q=document.documentElement.scrollTop=0"  
# driver.execute_script(js)  

# 滚动条拉到指定位置（具体元素）  
target = driver.find_element_by_id("rs")  
driver.execute_script("arguments[0].scrollIntoView();", target)  

#将网页滚动到网页底部
driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")

# 向下滚动200个像素，鼠标位置也跟着变了
driver.execute_script("window.scrollBy(0,200)", "") 

# 类似于按键盘上的PgDn按键，可以换成Keys.DOWN(下箭头，不过这个下拉进度比较慢)  
for i in range(6):  
    ActionChains(driver).send_keys(Keys.PAGE_DOWN).perform()  
    time.sleep(1)  

time.sleep(3)  
driver.close()