解决Mac下安装nmp的淘宝镜像失败

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 16.6.0npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "cnpm" "--registry=https://registry.npm.taobao.org" "--verbose"npm ERR! node v6.11.0npm ERR! npm  v3.10.10npm ERR! path ../lib/node_modules/cnpm/bin/cnpmnpm ERR! code EACCESnpm ERR! errno -13npm ERR! syscall symlinknpm 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