mac环境下 npm install 报'' Error: Cannot find module 'semver' ''

edward@Edward:~$sudo npm install cordova -g
module.js:487
    throw err;
    ^

Error: Cannot find module 'semver'
    at Function.Module._resolveFilename (module.js:485:15)
    at Function.Module._load (module.js:437:25)
    at Module.require (module.js:513:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/usr/local/lib/node_modules/npm/lib/utils/unsupported.js:2:14)
    at Module._compile (module.js:569:30)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:503:32)
    at tryModuleLoad (module.js:466:12)
    at Function.Module._load (module.js:458:3)

需要重新安装node

sudo rm -rf /usr/local/lib/node_modules

sudo rm -rf ~/.npm

brew uninstall --force node         (会提示:
Error: Refusing to uninstall /usr/local/Cellar/node/8.1.4
because it is required by yarn 0.27.5, which is currently installed.
You can override this and force removal with:
  brew uninstall --ignore-dependencies node
)

brew install node