原始代码：

WebDriverWait(self.driver,10).until(EC.visibility_of_element_located((By.XPATH, '//*[starts-with(@id,"s_user_name_menu"]/div/a[4]'))).click()
self.driver.find_element_by_class_name('quit').click()

出现问题：

Traceback (most recent call last):

File "D:\python\p\lib\unittest\case.py", line 59, in testPartExecutor yield

File "D:\python\p\lib\unittest\case.py", line 615, in run testMethod()

File "D:\python\Testkuangjia\unittest\pandabus_unittest\pandabus_unittest\testcase\test_login_baidu.py", line 77, in test_loginBtn self.driver.find_element_by_xpath( '//*[@id="s_user_name_menu"]').click()

File "D:\python\p\lib\site-packages\selenium\webdriver\remote\webelement.py", line 80, in click self._execute(Command.CLICK_ELEMENT)

File "D:\python\p\lib\site-packages\selenium\webdriver\remote\webelement.py", line 633, in _execute return self._parent.execute(command, params)

File "D:\python\p\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute self.error_handler.check_response(response)

File "D:\python\p\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace)

selenium.common.exceptions.ElementNotVisibleException: Message: element not interactable (Session info: chrome=74.0.3729.108) (Driver info: chromedriver=2.43.600210 (68dcf5eebde37173d4027fa8635e332711d2874a),platform=Windows NT 6.1.7601 SP1 x86_64)

对于出现这种问题，是因为需要定位的元素在页面中被隐藏了，比如（我的是定位百度账号退出按钮，由于，退出按钮被隐藏，只有当鼠标移动到用户账号时，才显示出退出按钮）

解决办法就是添加鼠标悬浮定位功能，

# 鼠标悬停
def hover(self,by,value):
      element = self.findElement(by,value)
      ActionChains(self.driver).move_to_element(element).perform()

# 通过不同的方式查找界面元素
def findElement(self,by,value):
      if(by == "id"):
            element = self.driver.find_element_by_id(value)
            return element
      elif(by == "name"):
             element = self.driver.find_element_by_name(value)
             return element
      elif(by == "xpath"):
             element = self.driver.find_element_by_xpath(value)
             return element
      elif(by == "classname"):
             element = self.driver.find_element_by_class_name(value)
             return element
      elif(by == "css"):
             element = self.driver.find_element_by_css_selector(value)
             return element
      elif(by == "link_text"):
             element = self.driver.find_element_by_link_text(value)
             return element
      else:
             print("无对应方法，请检查")
             return None

 # 检查是否存在用户退出按钮，存在，登录成功，否则登录失败
 self.driver.hover(by='xpath',value='//*[@id="s_username_top"]/span')
 close = self.driver.findElement(by='xpath',value='//*[@id="s_user_name_menu"]/div/a[4]')
 print(close)
 if close != None:
     self.assertEqual(1,1)
 else:
     self.assertEqual(1,0)
     time.sleep(3)