使用Mac命令行安装ChromeDriver为：
brew cask install chromedriver
安装过程为：
➜ ~ brew cask install chromedriver
==> Satisfying dependencies
==> Downloading
######################################################################## 100.0%
==> Verifying SHA-256 checksum for Cask 'chromedriver'.
==> Installing Cask chromedriver
==> Linking Binary 'chromedriver' to '/usr/local/bin/chromedriver'.
🍺 chromedriver was successfully installed!
在Python中测试为：
>>> from selenium import webdriver
>>> browser = webdriver.Chrome()
>>> browser.get('https://xiaoledeng.github.io')