安装报错log如下：

> node install-npm.js

info Chromedriver Install Installing Chromedriver version '2.33' for platform 'mac' and architecture '64'

info Chromedriver Install Opening temp file to write chromedriver_mac64 to...

info Chromedriver Install Downloading https://chromedriver.storage.googleapis.com/2.33/chromedriver_mac64.zip...

RequestError: Error: connect ETIMEDOUT 172.217.160.112:443

    at new RequestError (/Users/09/Downloads/appium-1.7.2/node_modules/request-promise/lib/errors.js:11:15)

    at Request.RP$callback [as _callback] (/Users/09/Downloads/appium-1.7.2/node_modules/request-promise/lib/rp.js:60:32)

    at self.callback (/Users/09/Downloads/appium-1.7.2/node_modules/request/request.js:186:22)

    at Request.emit (events.js:159:13)

    at Request.onRequestError (/Users/09/Downloads/appium-1.7.2/node_modules/request/request.js:878:8)

    at ClientRequest.emit (events.js:159:13)

    at TLSSocket.socketErrorListener (_http_client.js:389:9)

    at TLSSocket.emit (events.js:159:13)

    at emitErrorNT (internal/streams/destroy.js:64:8)

    at process._tickCallback (internal/process/next_tick.js:152:19)

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! appium-chromedriver@3.1.4 install: `node install-npm.js`

npm ERR! Exit status 1

npm ERR! 

npm ERR! Failed at the appium-chromedriver@3.1.4 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/09/.npm/_logs/2018-01-09T05_59_22_922Z-debug.log

解决办法，去appium官网下载源码

解压文件在目录：node_modules文件夹中增加appium-chromedriver目录

将log中的地址文件：https://chromedriver.storage.googleapis.com/2.33/chromedriver_mac64.zip

下载，将解压后的内容放到刚创建的目录中，之后从终端进入源码目录，执行npm install

即可。