已经设置了 yarn 的镜像源为淘宝镜像，也在 .npmrc 中设置了 phantomjs_cdnurl=https://npm.taobao.org/mirrors/phantomjs/，但执行 yarn install 时还是无法正确安装 PhantomJS，错误代码如下：
...
[-/2] ⠂ waiting...
[2/2] ⠂ phantomjs-prebuilt: Receiving...
[-/2] ⠂ waiting...
[-/2] ⠂ waiting...
error /home/charley/CODES/charley-praise/node_modules/phantomjs-prebuilt: Command failed.
Exit code: 1
Command: node install.js
Arguments:
Directory: /home/charley/CODES/charley-praise/node_modules/phantomjs-prebuilt
Output:
PhantomJS not found on PATH
Downloading https://npm.taobao.org/mirrors/phantomjs//phantomjs-2.1.1-linux-x86_64.tar.bz2
Saving to /tmp/phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2
Receiving...
Error making request.
Error: tunneling socket could not be established, cause=connect EINVAL 0.0.31.182:80 - Local (0.0.0.0:0)
at ClientRequest.onError (/home/charley/CODES/charley-praise/node_modules/tunnel-agent/index.js:177:17)
at ClientRequest.g (events.js:292:16)
at emitOne (events.js:96:13)
at ClientRequest.emit (events.js:188:7)
at Socket.socketErrorListener (_http_client.js:310:9)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at emitErrorNT (net.js:1281:8)
at _combinedTickCallback (internal/process/next_tick.js:80:11)
解决方案也很简单，根据错误提示，手动到 https://npm.taobao.org/mirrors/phantomjs//phantomjs-2.1.1-linux-x86_64.tar.bz2 下载 PhantomJS 文件，并将该文件拷贝到 /tmp/phantomjs 目录下：
cp phantomjs-2.1.1-linux-x86_64.tar.bz2 /tmp/phantomjs
完。
