npm综合

npm –v

源管理工具

npm i -g nrm

查看当前的源是哪一个，并全部列出来

nrm ls

查看源的速度

nrm test

查看单个源速度

nrm test taobao

切换源

nrm use taobao

查看当前使用的源

nrm current

nrm报错

internal/validators.js:124
    throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
    ^

[TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined
  at validateString (internal/validators.js:124:11)
  at Object.join (path.js:375:7)
  at Object.<anonymous> (D:
vmv14.15.4
ode_modules
rmcli.js:17:20)
  at Module._compile (internal/modules/cjs/loader.js:1063:30)
  at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
  at Module.load (internal/modules/cjs/loader.js:928:32)
  at Function.Module._load (internal/modules/cjs/loader.js:769:14)
  at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
  at internal/main/run_main_module.js:17:47
] {
  code: 'ERR_INVALID_ARG_TYPE'
}

找到 C:UsersAdministratorAppDataRoaming pm ode_modules rmcli.js  第17行修改成

//const NRMRC = path.join(process.env.HOME, '.nrmrc'); (删除)

const NRMRC = path.join(process.env[(process.platform == 'win32') ? 'USERPROFILE' : 'HOME'], '.nrmrc');

'webpack-dev-server' 不是内部或外部命令，也不是可运行的程序 或批处理文件。解决方法：

现在使用webpack要同时安装webpack-cli这个包，才可以调用webpack和webpack-dev-server这些命令。

npm i webpack webpack-dev-server webpack-cli --save-dev