這是因為vue和vuex的版本不兼容
vue版本2.0要對應vuex版本3.0
如果是vue2.0版本，安裝了vuex4.0版本，把vuex降級
npm install --save vuex@3.6.2
vue版本3.0要對應vuex版本4.0
vue3.0對應
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[轉]export ‘default‘ (imported as ‘Vue‘) was not found in ‘vue