我正在尝试生成一个新的 Angular 项目：
npm install -g @angular/cli
并弹出一个错误，我不知道如何解决：
npm ERR! code EACCES
npm ERR! syscall access
npm ERR! path /usr/local/lib/node_modules/@angular/cli/node_modules/@schematics/update/node_modules/npm-package-arg/node_modules/semver
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/@angular/cli/node_modules/@schematics/update/node_modules/npm-package-arg/node_modules/semver'
npm ERR! { [Error: EACCES: permission denied, access '/usr/local/lib/node_modules/@angular/cli/node_modules/@schematics/update/node_modules/npm-package-arg/node_modules/semver']
npm ERR! stack:
npm ERR! 'Error: EACCES: permission denied, access \'/usr/local/lib/node_modules/@angular/cli/node_modules/@schematics/update/node_modules/npm-package-arg/node_modules/semver\'',
npm ERR! errno: -13,
npm ERR! code: 'EACCES',
npm ERR! syscall: 'access',
npm ERR! path:
npm ERR! '/usr/local/lib/node_modules/@angular/cli/node_modules/@schematics/update/node_modules/npm-package-arg/node_modules/semver' }
npm ERR!
npm ERR! The operation was rejected by …