vorlon和cnpm都安装不了权限问题mac

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! errno -13

npm ERR! Error: EACCES: permission denied, symlink '../lib/node_modules/cnpm/bin/cnpm' -> '/usr/local/bin/cnpm'

npm ERR!  [OperationalError: EACCES: permission denied, symlink '../lib/node_modules/cnpm/bin/cnpm' -> '/usr/local/bin/cnpm'] {

npm ERR!   cause: [Error: EACCES: permission denied, symlink '../lib/node_modules/cnpm/bin/cnpm' -> '/usr/local/bin/cnpm'] {

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!   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! 

npm ERR! The operation was rejected by your operating system.

npm ERR! It is likely you do not have the permissions to access this file as the current user

npm ERR! 

npm ERR! If you believe this might be a permissions issue, please double-check the

npm ERR! permissions of the file and its containing directories, or try running

npm ERR! the command again as root/Administrator.