Public registration is not allowed

npm login 或者 npm adduser 之后 遇见 Public registration is not allowed

npm ERR! code E403
npm ERR! 403 403 Forbidden - PUT {url}:username - [FORBIDDEN] Public registration is not allowed
npm ERR! 403 In most cases, you or one of your dependencies are requesting
npm ERR! 403 a package version that is forbidden by your security policy, or
npm ERR! 403 on a server you do not have access to.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/******/.npm/_logs/{time}-debug-0.log

其实是因为npm镜像地址有问题 使用下方指令 将镜像切回即可正确完成登录操作

npm config set registry https://registry.npmjs.org/