遍历的时候莫名其妙报错：Elements in iteration expect to have ‘v-bind:key‘ directives vue/require-v-for-key
解决办法：需要给出for的key，参见如下写法
<li v-for="(item, index) in list" :key="index"> {{item}}
vue全家桶-v-for报错Elements in iteration expect to have 'v-bind:key' directives vue/require-v-for-key
原文：https://www.cnblogs.com/always200/p/12829362.html