解决Mac下安装nmp的淘宝镜像失败问题

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

npm ERR! Darwin 16.6.0
npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "pm" "--registry=https://registry.npm.taobao." "--verbose"
npm ERR! node v6.11.0
npm ERR! npm v3.10.10
npm ERR! path ../lib/node_modules/pm/bin/pm
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall symlink

npm ERR! Error: EACCES: permission denied, symlink '../lib/node_modules/pm/bin/pm' -> '/usr/local/bin/pm'
npm ERR!  at Error (native)
npm ERR! { Error: EACCES: permission denied, symlink '../lib/node_modules/pm/bin/pm' -> '/usr/local/bin/pm'
npm ERR!  at Error (native)
npm ERR! errno: -13,
npm ERR! code: 'EACCES',
npm ERR! syscall: 'symlink',
npm ERR! path: '../lib/node_modules/pm/bin/pm',
npm ERR! dest: '/usr/local/bin/pm' }
npm ERR! 
npm ERR! Please try running this mand 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

Please try running this mand again as root/Administrator 

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