代码如下

#设置浏览器
chrome_options = webdriver.ChromeOptions()
# chrome_options.add_argument("--headless")
chrome_options.add_argument('log-level=3')  
prefs = {"download.default_directory": 'F:\a\python\selenium',
"profile.managed_default_content_settings.images":2,
"download.prompt_for_download": False}
chrome_options.add_experimental_option("prefs",prefs)
driver = webdriver.Chrome(chrome_options=chrome_options)

它始终下载到c盘的下载目录，就算手动更改了默认下载路径，它依然无效