mac内nodejs如何更新最新版本

sudo npm install -g n

sudo n latest

sudo n stable

npm ERR! Darwin 16.4.0
npm ERR! argv "/usr/local/Cellar/node/6.4.0/bin/node" "/usr/local/bin/npm" "update" "-g"
npm ERR! node v6.4.0
npm ERR! npm v4.1.2
npm ERR! path /usr/local/lib/node_modules/cnpm/node_modules/agentkeepalive
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall access
npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/cnpm/node_modules/agentkeepalive'
npm ERR! at Error (native)
npm ERR! { Error: EACCES: permission denied, access '/usr/local/lib/node_modules/cnpm/node_modules/agentkeepalive'
npm ERR! at Error (native)
npm ERR! errno: -13,
npm ERR! code: 'EACCES',
npm ERR! syscall: 'access',
npm ERR! path: '/usr/local/lib/node_modules/cnpm/node_modules/agentkeepalive' }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.
npm ERR! Please include the following file with any support request:
npm ERR! /Users/
admin/Projects/CoPilot/npm-debug.log