1.得到原本的镜像地址

npm get registry

> https://registry.npmjs.org/

设成淘宝的

npm config set registry http://registry.npm.taobao.org/

2.换成原来的

npm config set registry https://registry.npmjs.org/

3.mac 下的chromedriver老是下载不下来，解决办法

npm install chromedriver --chromedriver_cdnurl=http://cdn.npm.taobao.org/dist/chromedriver