mac 安装 chromedriver
$ brew cask install chromedriver ==> Satisfying dependencies ==> Downloading https://chromedriver.storage.googleapis.com/2.45/chromedriver_mac64.zip ######################################################################## 100.0% ==> Verifying SHA-256 checksum for Cask 'chromedriver'. ==> Installing Cask chromedriver ==> Linking Binary 'chromedriver' to '/usr/local/bin/chromedriver'. 🍺 chromedriver was successfully installed!