vue报错：[Vue warn]: Duplicate keys detected: ‘[object Object]‘. This may cause an update error.

[Vue warn]: Avoid using non-primitive value as key, use string/number value instead.

原因：检测到重复的键：“[object]”。

<div v-for='item in items' :key='item'>

解决：修改key值

<div v-for='item in items' :key='item.index'>
或：
<div v-for='(item,index)in items' :key='index'>