vue for循环报错Elements in iteration expect to have 'v-bind:key' directives
<div class="line-item" v-for="(item, index) in productList" :key="index">
写for循环的时候,一定要加key,不加key会报如下错
<div class="line-item" v-for="(item, index) in productList" :key="index">
写for循环的时候,一定要加key,不加key会报如下错