npm install时报错：npm ERR! fatal: unable to access

$ npm install
npm ERR! code 128
npm ERR! A git connection error occurred
npm ERR! command git --no-replace-objects clone -b 2.2.0-c ssh://git@github.com/nhn/raphael.git C:\Users\Administrator\AppData\Local\npm-cache\_cacache\tmp\git-cloneJowlmS --recurse-submodules --depth=1 --config core.longpaths=true
npm ERR! Cloning into 'C:\Users\Administrator\AppData\Local\npm-cache\_cacache\tmp\git-cloneJowlmS'...
npm ERR! fatal: unable to access 'https://github.com/nhn/raphael.git/': Failed to connect to github.com port 443 after 21061 ms: Timed out

解决办法： git config --global url."https://".insteadOf git://