(Emitted value instead of an instance of Error)

本地運行vue項目因爲警告導致 不能啓動

(Emitted value instead of an instance of Error) Do not use v-for index as key on <transition-group> children, this is the same as not using keys.
意思是在<transition-group>子元素上，不要使用v-for索引作爲鍵，否則與不使用鍵相同

解決方案：

修改 :key="index"