$ npm install -g cnpm --registry=https://registry.npm.taobao.org
npm ERR! Windows_NT 10.0.14393
npm ERR! argv "D:\\node\\node.exe" "D:\\node\\node_modules\\npm\\bin\\npm-cli.js " "install" "-g" "cnpm" "--registry=https://registry.npm.taobao.org"
npm ERR! node v6.11.2
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! <https://github.com/npm/npm/issues>
npm ERR! Please include the following file with any support request:
npm ERR! C:\Users\admin\npm-debug.log
请问怎么解决