执行npm link 报错

liuffsunny@liufangfangdeMacBook-Pro 02learnCli % npm link
npm ERR! code EACCES
npm ERR! syscall symlink
npm ERR! path /Users/liuffsunny/Documents/node练习/02learnCli
npm ERR! dest /usr/local/lib/node_modules/02learnCli
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, symlink '/Users/liuffsunny/Documents/node练习/02learnCli' -> '/usr/local/lib/node_modules/02learnCli'
npm ERR!  [Error: EACCES: permission denied, symlink '/Users/liuffsunny/Documents/node练习/02learnCli' -> '/usr/local/lib/node_modules/02learnCli'] {
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'symlink',
npm ERR!   path: '/Users/liuffsunny/Documents/node练习/02learnCli',
npm ERR!   dest: '/usr/local/lib/node_modules/02learnCli'
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/liuffsunny/.npm/_logs/2021-01-29T08_20_09_711Z-debug.log
liuffsunny@liufangfangdeMacBook-Pro 02learnCli % cd /Users/liuffsunny/Documents/node练习/02learnCli
liuffsunny@liufangfangdeMacBook-Pro 02learnCli % npm link
npm ERR! code EACCES
npm ERR! syscall symlink
npm ERR! path /Users/liuffsunny/Documents/node练习/02learnCli
npm ERR! dest /usr/local/lib/node_modules/02learnCli
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, symlink '/Users/liuffsunny/Documents/node练习/02learnCli' -> '/usr/local/lib/node_modules/02learnCli'
npm ERR!  [Error: EACCES: permission denied, symlink '/Users/liuffsunny/Documents/node练习/02learnCli' -> '/usr/local/lib/node_modules/02learnCli'] {
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'symlink',
npm ERR!   path: '/Users/liuffsunny/Documents/node练习/02learnCli',
npm ERR!   dest: '/usr/local/lib/node_modules/02learnCli'
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/liuffsunny/.npm/_logs/2021-01-29T08_23_19_527Z-debug.log

解决方案：
官方的解决方案：https://docs.npmjs.com/getting-started/fixing-npm-permissions

官方提供了两种解决方案：

重新安装一个node version manager。（官方推荐）
参考地址：https://docs.npmjs.com/getting-started/installing-node

注：这个方法比较繁琐，我选择的是第二种方案。
2.改变npm默认的路径。
步骤如下：
进入终端，依次输入一下命令
（1）创建global安装任务的目录
mkdir ~/.npm-global
（2）配置npm使用新的目录
npm config set prefix '~/.npm-global'
（3）在~/.profile文件中增加配置
export PATH=~/.npm-global/bin:$PATH
（4）配置文件立即生效
source ~/.profile （也可以不执行）
（5）重新执行命令
npm link 完美解决