Vue运行，出现warning(Emitted value instead of an instance of Error)
vue运行时，出现warning：(Emitted value instead of an instance of Error) <CarouselItem v-for="item in bannerlist">: component lists rendered with v-for should have explicit keys. See h
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vue运行时，出现warning：(Emitted value instead of an instance of Error) <CarouselItem v-for="item in bannerlist">: component lists rendered with v-for should have explicit keys. See https://vuejs.org/guide/list.html#key for more info.
截图如下：
解决方法：在组件内加入自定义属性key
源代码：
修改后：
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