在写vue项目时,浏览器的console出现如下警告信息:
[Vue warn]: Property or method "index" 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. found in ---> <Navheader> at E:\GitRepository\companyProject\src\components\crimalcheck\crimalcheck.vue <App> at E:\GitRepository\companyProject\src\App.vue <Root>
原因很简单:不熟悉或者粗心的情况下很容易把v-for循环写成如下形式
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