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Python Selenium屏幕截图无法获取整个页面

PhantomsJS的解决方案似乎正在起作用：

driver = webdriver.PhantomJS()    
driver.maximize_window()
driver.get('http://www.angelfire.com/super/badwebs/')  
scheight = .1
while scheight < 9.9:
    driver.execute_script("window.scrollTo(0, document.body.scrollHeight/%s);" % scheight)
    scheight += .01        
driver.save_screenshot('angelfire_phantomjs.png')

但是，该解决方案来自2014年，同时不建议使用PhantomJS。我正在收到此错误消息：

...
UserWarning: Selenium support for PhantomJS has been deprecated, please use headless versions of Chrome or Firefox instead
warnings.warn('Selenium support for PhantomJS has been deprecated, please use headless '

如果我尝试像这样无头地适应Firefox：

from selenium import webdriver

firefox_options = webdriver.FirefoxOptions()
firefox_options.set_headless() 
firefox_driver = webdriver.Firefox(firefox_options=firefox_options)

firefox_driver.get('http://www.angelfire.com/super/badwebs/')  
scheight = .1
while scheight < 9.9:
    firefox_driver.execute_script("window.scrollTo(0, document.body.scrollHeight/%s);" % scheight)
    scheight += …