npm被公司墙了，不能用npm安装任何包应用了。
npm ERR! Darwin 15.5.0 npm ERR! argv "/usr/local/Cellar/node/6.4.0/bin/node" "/usr/local/bin/npm" "install" "webpack" npm ERR! node v6.4.0 npm ERR! npm v3.10.3 npm ERR! code UNABLE_TO_GET_ISSUER_CERT_LOCALLY npm ERR! unable to get local issuer certificate npm ERR! npm ERR! If you need help, you may report this error at: npm ERR! <https://github.com/npm/npm/issues> npm ERR! Please include the following file with any support request: npm ERR! /Users/huangtaizhao/les/react/npm-debug.log
在确定所安装的包是安全的情况下，可以这样做（关闭npm的https）：
npm config set strict-ssl false
npm config set strict-ssl false