第一个坑：’geckodriver’ executable needs to be in PATH
1.如果启动浏览器过程中报如下错误
Traceback (most recent call last):
File “<stdin>”, line 1, in <module>
File “D:\test\python3\lib\site-packages\selenium\webdriver\firefox\webdriver.py”, line 145, in __init__
self.service.start()
File “D:\test\python3\lib\site-pac
