[Medium] 📄 Best Practices

1. Why you shouldn't use index as a key in lists and iterators?

为什么不应该使用 index 作为 key 值？

在 Vue、React 等框架的面试题目中都会有类似的题目：

• What happens if there is no key in v-for?
• Why you shouldn't use index as a key in React lists and iterators?