如果element是None,会直接就报错的了：

定位方式： class 定位值： zuozs 元素定位失败
Traceback (most recent call last):
File “e:/Anaconda3/vscode/open_browser.py”, line 184, in
print(selfnium_driver.get_element(‘class’,‘zuozs’))
File “e:/Anaconda3/vscode/open_browser.py”, line 107, in get_element
return self.element_isdisplayed(element)
File “e:/Anaconda3/vscode/open_browser.py”, line 79, in element_isdisplayed
flag = element.is_displayed()
AttributeError: ‘NoneType’ object has no attribute ‘is_displayed’