解決方案
錯誤代碼如下所示：
<router-view @hideBox="hideLoginRegisterBox" @changeUI="changeLoginType"/>
報錯如下所示：
修改代碼如下：
<router-view @hideBox="hideLoginRegisterBox" :changeUI="changeLoginType"/>
至此問題解決
Vue報錯：Invalid handler for event "changeUI": got undefined
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