vue3 Elements in iteration expect to have 'v-bind:key' directives

https://www.cnblogs.com/zdz8207/p/vue-for-v-bind-key.html

解决方法：
1.在v-for 后添加 :key='item'
<li v-for="i in list" :key="i">

<div class="item" v-for="(user,index) in datalist" :key='index' >