项目使用vue开发，通过npm install安装全局依赖的时候，出错了，卡在了chromedriver的地方，日志内容

huyikangdeMacBook-Pro:vbap-widgets kangkang$ npm install

> chromedriver@2.33.2 install /Users/kangkang/vbap-widgets/node_modules/chromedriver
> node install.js

Downloading https://chromedriver.storage.googleapis.com/2.33/chromedriver_mac64.zip
Saving to /var/folders/6_/vt2sqf214dn36kyl97183j6c0000gn/T/chromedriver/chromedriver_mac64.zip
ChromeDriver installation failed Error with http(s) request: Error: read ETIMEDOUT
npm WARN vbap-widgets@3.0.6-SNAPSHOT No license field.

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!     /Users/kangkang/.npm/_logs/2017-11-28T01_10_25_967Z-debug.log

显示在chromedriver@2.33.2 install script的时候失败了，把连接复制到浏览器，就是访问不了啦，只能找一个国内的镜像源安装，首先想到的就是淘宝的镜像源。解决办法：

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

huyikangdeMacBook-Pro:vbap-widgets kangkang$ npm install chromedriver --chromedriver_cdnurl=http://npm.taobao.org/mirrors/chromedriver

> chromedriver@2.33.2 install /Users/kangkang/vbap-widgets/node_modules/chromedriver
> node install.js

Downloading http://npm.taobao.org/mirrors/chromedriver/2.33/chromedriver_mac64.zip
Saving to /var/folders/6_/vt2sqf214dn36kyl97183j6c0000gn/T/chromedriver/chromedriver_mac64.zip
Received 783K...
Received 1564K...
Received 2348K...
Received 3131K...
Received 3914K...
Received 4695K...
Received 5299K total.
Extracting zip contents
Copying to target path /Users/kangkang/vbap-widgets/node_modules/chromedriver/lib/chromedriver
Fixing file permissions
Done. ChromeDriver binary available at /Users/kangkang/vbap-widgets/node_modules/chromedriver/lib/chromedriver/chromedriver
npm WARN vbap-widgets@3.0.6-SNAPSHOT No license field.

+ chromedriver@2.33.2
added 2 packages in 13.709s