报错如下：
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR!chromedriver@2.33.2 install: `node install.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the chromedriver@2.33.2 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Administrator\AppData\Roaming\npm-cache\_logs\2017-12-07T07_47_57_361Z-debug.log
解决方法：npm install chromedriver --chromedriver_cdnurl=http://cdn.npm.taobao.org/dist/chromedriver