because of the lower version of vue-cli, the project has been stuck in the input project name when you created the project. So I want to update vue-cli, but keep reporting errors. Even if you uninstall it, you can"t update it again. Excuse me, what"s going on with this? Thank you all for 
the latest version of vue-cli can install yarn global add @ vue/cli this is version 3.0
ide/" rel=" nofollow noreferrer "> vue-cli official documentation
this is a problem with npm. It is recommended to reinstall npm
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