C:\Users\you name>npm cache clean
npm ERR! As of npm@5, the npm cache self-heals from corruption issues and data extracted from the cache is guaranteed to be valid. If you want to make sure everything is consistent, use 'npm cache verify' instead. On the other hand, if you're debugging an issue with the installer, you can use `npm install --cache /tmp/empty-cache` to use a temporary cache instead of nuking the actual one.
npm ERR!
npm ERR! If you're sure you want to delete the entire cache, rerun this command with --force.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\you name\AppData\Roaming\npm-cache\_logs\2019-05-12T07_07_25_826Z-debug.log
解決方案 由於 npm 5 使用了新的包管理模式，所以在升級之后，請先清空一下本地緩存：
npm cache clean --force 。 如果上邊沒辦法解決問題，可以嘗試下邊的指令：
npm cache clear --force && npm install --no-shrinkwrap --update-binary