怎样处理Mac内安装nmp淘宝镜像失败

安装命令如下：

npm install -g cnpm --registry=https://registry.npm.taobao.org --verbose

提示报错，信息如下：

npm ERR! Darwin 16.6.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "cnpm" "--registry=https://registry.npm.taobao.org" "--verbose"
npm ERR! node v6.11.0
npm ERR! npm v3.10.10
npm ERR! path ../lib/node_modules/cnpm/bin/cnpm
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall symlink
npm ERR! Error: EACCES: permission denied, symlink '../lib/node_modules/cnpm/bin/cnpm' -> '/usr/local/bin/cnpm'
npm ERR!  at Error (native)
npm ERR! { Error: EACCES: permission denied, symlink '../lib/node_modules/cnpm/bin/cnpm' -> '/usr/local/bin/cnpm'
npm ERR!  at Error (native)
npm ERR! errno: -13,
npm ERR! code: 'EACCES',
npm ERR! syscall: 'symlink',
npm ERR! path: '../lib/node_modules/cnpm/bin/cnpm',
npm ERR! dest: '/usr/local/bin/cnpm' }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.
npm verb exit [ -13, true ]
npm ERR! Please include the following file with any support request:
npm ERR!  /Users/xxx/npm-debug.log

注意到这一句提示：

Please try running this command again as root/Administrator

于是将命令最后改为如下所示，成功安装

sudo npm install -g cnpm --registry=https://registry.npm.taobao.org --verbose

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