python - seleniumexecute_script() 返回错误值

Question

我在 float 页面上执行了下面的代码，例如 https://www.youtube.com/user/JFlaMusic/videos使用 python selenium chromedriver。但代码执行不正确。我原本希望转到页面末尾，但是 last_height 和 new_height 在条件循环中一开始是相同的。所以执行了break。为什么会出现这样的结果？

last_height = self.driver.execute_script("return document.documentElement.scrollHeight")
print(last_height)
while True:
    self.driver.execute_script("window.scrollTo(0, document.documentElement.scrollHeight);")
    time.sleep(0.5)
    new_height = self.driver.execute_script("return document.documentElement.scrollHeight")
    print(new_height)
    if new_height == last_height:
        break
    last_height = new_height

Answer 1

不要使用看起来相当不可靠的 time.sleep(0.5)，而是尝试按如下方式实现 ExplicitWait 来等待页面滚动:

from selenium.webdriver.support.ui import WebDriverWait as wait
from selenium.common.exceptions import TimeoutException

last_height = self.driver.execute_script("return document.documentElement.scrollHeight")
print(last_height)
while True:
    self.driver.execute_script("window.scrollTo(0, document.documentElement.scrollHeight);")
    try:
        wait(self.driver, 5).until(lambda driver: self.driver.execute_script("return document.documentElement.scrollHeight") > last_height)
    except TimeoutException:
        break
    last_height = self.driver.execute_script("return document.documentElement.scrollHeight")