selenium 滚动条

什么情况下，需要把元素放到可见区域我才可以操作呢？ 懒加载/慢加载 必须把元素移动可见区域

"""
滚动条操作
"""
import time
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Chrome()
driver.get("https://www.baidu.com")
driver.find_element(By.ID, "kw").send_keys("selenium webdriver")
driver.find_element(By.ID, "su").click()
loc = (By.XPATH, "//div[@id='7']/h3/a")

# 显示等待 presence_of_element_located不一定元素可见，只要存在即可
WebDriverWait(driver, 15).until(EC.presence_of_element_located(loc))
el2 = driver.find_element(*loc)
time.sleep(2)
# el2.click()

# 实现滚动条从顶部到底部
driver.execute_script("scrollTo(0,document.body.scrollHeight)")
time.sleep(2)

# 实现滚动条从浏览器底部到顶部
driver.execute_script("scrollTo(document.body.scrollHeight,0)")
time.sleep(2)

# 操作哪个元素，滚动条移动到元素附近（元素与页面的顶部对齐，元素与页面的底部对
js2 = "arguments[0].scrollIntoView(false);"
driver.execute_script(js2, el2)
time.sleep(2)