打開終端輸入一下命令：
sudo npm install -g cnpm --registry=https://registry.npm.taobao.org --verbose
如果提示 Password 輸入開機密碼即可
cnpm -v
出現以下內容即爲成功
[email protected] (/usr/local/lib/node_modules/cnpm/lib/parse_argv.js)
[email protected] (/usr/local/lib/node_modules/cnpm/node_modules/npm/lib/npm.js)
[email protected] (/usr/local/bin/node)
[email protected] (/usr/local/lib/node_modules/cnpm/node_modules/npminstall/lib/index.js)
prefix=/usr/local
darwin x64 18.7.0
registry=https://r.npm.taobao.org