[Vuetify] Multiple instances of Vue detected

vuejs使用vuetify报错

[Vuetify] Multiple instances of Vue detected  "$attrs is readonly" 

解决办法：

The actual fix for this is to ensure both Vue and Vuetify are treated the same way in the webpack externals, e.g. putting both (or neither?) in the let whiteListedModules = ['vue', 'vuetify'] line in these vuetify webpack builds

就是在webpack配置文件里将

let whiteListedModules = ['vue']

改成

let whiteListedModules = ['vue', 'vuetify']

在这里看的

https://github.com/vuetifyjs/vuetify/discussions/4068#issuecomment-439903698