WebDriverWait.until-JavaScript错误：无法读取未定义的属性'get'

Question

我具有访问网站并导出一些Excel文件的功能。为此，我从硒中导入：

from selenium.webdriver.support.ui import WebDriverWait

而且我在WebDriverWait的'until'内调用函数every_downloads_chrome。

nameFile = WebDriverWait(driver, 120, 1).until(every_downloads_chrome)

# method to get the downloaded file name
def every_downloads_chrome(driver):
    if not driver.current_url.startswith("chrome://downloads"):
        driver.execute_script("window.open('');")
        driver.switch_to.window(driver.window_handles[1])
        driver.get("chrome://downloads/")
    return driver.execute_script("""
        var items = downloads.Manager.get().items_;
        if (items.every(e => e.state === "COMPLETE"))
            return items.map(e => e.fileUrl || e.file_url);
        """)

此功能在我的计算机上运行，​​该计算机为Windows 10-Google Chrome版本79.0.3945.130（64位）。但是，当我在Windows 10-Google 80.0.3987.122（64位）上尝试“生产计算机”时，出现错误：

Erro Message: javascript error: Cannot read property 'get' of undefined
  (Session info: chrome=80.0.3987.122)
Traceback (most recent call last):
  File "<ipython-input-1-e86f4018e9d8>", line 394, in job
    nameFile = WebDriverWait(driver, 120, 1).until(every_downloads_chrome)
  File "C:\Users\***\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\support\wait.py", line 71, in until
    value = method(self._driver)
  File "<ipython-input-1-e86f4018e9d8>", line 91, in every_downloads_chrome
    """)
  File "C:\Users\***\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 636, in execute_script
    'args': converted_args})['value']
  File "C:\Users\***\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "C:\Users\***\AppData\Local\Continuum\anaconda3\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.JavascriptException: Message: javascript error: Cannot read property 'get' of undefined
  (Session info: chrome=80.0.3987.122)

Answer 1

问题：downloads.Manager.get（）在80版本的Chrome之后不起作用。

所以，我更改了获取下载文件名的方法

def every_downloads_chrome(driver):
    if not driver.current_url.startswith("chrome://downloads"):
        driver.execute_script("window.open('');")
        driver.switch_to.window(driver.window_handles[1])
        driver.get("chrome://downloads/")
    return driver.execute_script("""
        var elements = document
        .querySelector('downloads-manager')
        .shadowRoot.querySelector('#downloadsList').items;
        if (elements.every(e => e.state === "COMPLETE"))
               return elements.map(elements =>elements.fileUrl || elements.file_url);
        """)