在执行 npm install 命令，偶尔会报出 chromedriver 无法下载的错误，通过查询，发现在 Github 下 vue-router 的 issue 上有对这个问题的解决办法，具体链接 issue，这篇博文总结了一下解决办法。
首先上错误信息：
Downloading https://chromedriver.storage.googleapis.com/2.33/chromedriver_mac64.zip
Saving to /usr/local/tomcat/project/hello-vue/node_modules/chromedriver/chromedriver/chromedriver_mac64.zip
ChromeDriver installation failed Error with http(s) request: Error: read ETIMEDOUT
npm WARN karma-sinon-chai@1.3.2 requires a peer of sinon@^2.1.0 but none was installed.
npm ERR! Darwin 15.6.0
npm ERR! argv "/usr/local/Cellar/node/5.8.0/bin/node" "/usr/local/bin/npm" "install"
npm ERR! node v7.8.0
npm ERR! npm v4.2.0
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 'node install.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the chromedriver package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node install.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs chromedriver
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls chromedriver
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /var/root/.npm/_logs/2017-10-27T01_56_37_026Z-debug.log
解决办法：
执行以下命令即可。
npm install chromedriver --chromedriver_cdnurl=http://cdn.npm.taobao.org/dist/chromedriver
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