我能够通过安装NPM 6(在撰写本文时为6.14.9)来解决此问题.

I was able to solve this by installing the NPM 6 (6.14.9 as of this writing)

npm i -g npm@6
npm i -g appium

如果您想锁定特定版本的npm而不是最新版本，那么应该可以将其安装到应安装的版本

If you want to lock into a particular version of npm instead of latest then this should get you to a version that should install it

npm i -g npm@6.14.9