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This article mainly shows you how "vue always uses:key in v-for", the content is simple and easy to understand, the organization is clear, I hope to help you solve doubts, let Xiaobian lead you to study and learn "vue always uses:key in v-for" this article.

Always use:key in v-for

Using the key attribute with the v-for instruction keeps the program constant and predictable when data needs to be manipulated.

This is necessary so Vue can track component state and have a constant reference to different elements. Keys are useful when using animation or Vue transitions.

Without a key, Vue simply tries to make DOM as efficient as possible. This could mean that elements in v-for might be out of order or that their behavior is unpredictable. If we had a unique key reference for each element, we could better predict exactly how Vue applications would handle DOM operations.

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