錯誤消息如圖：
如果你看到此錯誤消息，則說明 v-for 指令的 key值 重復了，只需修改你的 key值 讓其不會重復即可。
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[Vue warn]: Duplicate keys detected: '0'. This may cause an update error.
vue報錯之Duplicate keys detected: '0'. This may cause an update error.
[Vue warn]: Duplicate keys detected: ''. This may cause an update error.
[Vue warn]: Duplicate keys detected: ''. This may cause an update error.
Duplicate keys detected: '2'. This may cause an update error.
Duplicate keys detected: 'xxx'. This may cause an update error.
報錯解決 Duplicate keys detected: '1'. This may cause an update error.
Duplicate keys detected: '0'. This may cause an update error.
vue學習中遇到的錯誤 Duplicate keys detected: '[object Object]'. This may cause an update error.
[Vue warn]: Duplicate keys detected: 'area'. This may cause an update error.