vue npm WARN deprecated npm WARN

Last login: Thu Dec 19 00:22:01 on console
MacBook-Pro:~ cc$ npm install -g @vue/cli
npm WARN deprecated core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules
npm ERR! code EACCES
npm ERR! syscall access
npm ERR! path /usr/local/lib/node_modules
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules'
npm ERR!  [Error: EACCES: permission denied, access '/usr/local/lib/node_modules'] {
npm ERR!   stack: "Error: EACCES: permission denied, access '/usr/local/lib/node_modules'",
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'access',
npm ERR!   path: '/usr/local/lib/node_modules'
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.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/cc/.npm/_logs/2019-12-18T16_24_36_815Z-debug.log

此类错误在命令行前面加上sudo即可，比如sudo npm install -g @vue/cli

npm WARN deprecated core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
npm ERR! code EEXIST
npm ERR! syscall symlink
npm ERR! path ../lib/node_modules/@vue/cli/bin/vue.js
npm ERR! dest /usr/local/bin/vue
npm ERR! errno -17
npm ERR! EEXIST: file already exists, symlink '../lib/node_modules/@vue/cli/bin/vue.js' -> '/usr/local/bin/vue'
npm ERR! File exists: /usr/local/bin/vue
npm ERR! Remove the existing file and try again, or run npm
npm ERR! with --force to overwrite files recklessly.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users//.npm/_logs/2019-12-18T16_29_28_499Z-debug.log
根据提示，强制更新覆盖加上--force