解决方案
错误代码如下所示：
<router-view @hideBox="hideLoginRegisterBox" @changeUI="changeLoginType"/>
报错如下所示：
修改代码如下：
<router-view @hideBox="hideLoginRegisterBox" :changeUI="changeLoginType"/>
至此问题解决
Vue报错：Invalid handler for event "changeUI": got undefined
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