安装 vue-cli 或者其他任何东西 都出现以下错误。

$ npm install -g cnpm --registry=http://registry.npm.taobao.org
npm ERR! fetch failed http://registry.npm.taobao.org/cnpm/download/cnpm-4.5.0.tgz
npm WARN retry will retry, error on last attempt: Error: unable to verify the first certificate
npm ERR! fetch failed http://registry.npm.taobao.org/cnpm/download/cnpm-4.5.0.tgz
npm WARN retry will retry, error on last attempt: Error: unable to verify the first certificate
 $ cnpm -v
npm ERR! fetch failed http://registry.npm.taobao.org/cnpm/download/cnpm-4.5.0.tgz
npm ERR! Windows_NT 10.0.10586
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "cnpm" "--registry=http://registry.npm.taobao.org"
npm ERR! node v6.10.0
npm ERR! npm  v3.10.10
npm ERR! code UNABLE_TO_VERIFY_LEAF_SIGNATURE

npm ERR! unable to verify the first certificate
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!     

npm ERR! Please include the following file with any support request:
npm ERR!     C:\Users\bestsu\npm-debug.log