vue.runtime.esm.js:4560 [Vue warn]: Property or method “item“ is not defined on the instance but

• 报错异常

vue.runtime.esm.js:4560 [Vue warn]: Property or method “item” is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property. See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.

• 我的代码是这样的

<div   v-for="(item,index) in imagesList" :key="index+'image'" >
<!--Owner是我自己封装的组件 -->
<Owner :ownerListProp="item.userVos"></Owner>
</div>

• 一开始我以为是for 循环里item的问题（被别的博客带了节奏）。
• 我尝试把Owner 组件注释掉就没有这个警告了，随后我把Owner的代码每次注释一小段代码，然后调试，终于找到问题了，在Owner发现一个item,其实这里面是没有item变量的，是我复制粘贴的锅。