text: from selenium import webdriver
  from selenium.webdriver.common.action_chains import ActionChains
  from selenium.webdriver.common.keys import Keys
  driver = webdriver.Chrome()
  
  driver.get('http://39.107.96.138:3000/')
  login = driver.find_element_by_xpath('//*[@href="/signin"]').click()
  
  driver.find_element_by_xpath('//*[@id="name"]').send_keys('user1')
  driver.find_element_by_xpath('//*[@id="pass"]').send_keys('123456')
  driver.find_element_by_xpath('//*[@type="submit"]').click()
  
  driver.find_element_by_xpath('//*[@class="span-success"]').click()
  
  driver.find_element_by_xpath('//*[@id="tab-value"]').click()
  driver.find_element_by_xpath('//*[@id="tab-value"]/option[2]').click()
  
  driver.find_element_by_xpath('//*[@id="title"]').send_keys('20190108测试1，标题')
  
  content = driver.find_element_by_xpath('//*[@class="CodeMirror-scroll"]')
  content.click()
  
  action = ActionChains(driver)
  action.move_to_element(content)
  action.send_keys('20190108测试1，内容')
  
  # 第一种方法：在文本输入里面模拟快捷键 Ctrl + b 操作 
  action.key_down(Keys.CONTROL)
  action.send_keys('b')
  action.key_up(Keys.CONTROL)
  # 第二种方法：在文本输入里面模拟快捷键 Ctrl + b 操作 
  action.send_keys(Keys.CONTROL,'b')
  
  action.perform()
  
  