ai到底是个什么东西

XXXX@yyyy:~/桌面$ npm install npm-cli -g npm ERR! code EACCES npm ERR! syscall mkdir npm ERR! path /usr/local/lib/node_modules npm ERR! errno -13 npm ERR! Error: EACCES: permission denied, mkdir '/usr/local/lib/node_modules' npm ERR! [Error: EACCES: permiss