How keepalived works in vue

KeepAlive in Vue.js works through the following steps: When first loaded, the component is instantiated and added to the cache. When activated, creates a snapshot of the component, containing the current state and DOM structure. When switching, check whether the snapshot exists in the cache, and if so, reuse it directly. When updating, listen to component state changes and update the snapshot. On reactivation, the component state is restored from the updated snapshot. When destroyed, the component snapshot and instance are destroyed.

How KeepAlive works in Vue

KeepAlive in Vue.js is a component that can be used to cache activated component instance to improve page performance.

Working principle

KeepAlive mainly works through the following steps:

1. First load: When a component is loaded for the first time When loading, it is instantiated and added to the cache.
2. Activation: When a component is activated (i.e. displayed in view), KeepAlive creates a snapshot containing the component's current state and DOM structure.
3. Switching: When the user switches between components, KeepAlive checks whether there is a snapshot of the component being switched out in the cache.
4. Reuse: If the snapshot exists, KeepAlive will directly reuse the snapshot instead of re-instantiating the component. This can significantly improve performance, especially when components contain large amounts of data or complex logic.
5. Update: If you reuse a snapshot, KeepAlive will listen for changes in component status and update the snapshot accordingly. When the component is reactivated, it restores its state from the updated snapshot.
6. Destruction: KeepAlive destroys its snapshots and instances when a component is no longer needed.

Advantages

The main advantages of using KeepAlive include:

• Improving page performance: By reusing cached components, you can Reduce component rendering time.
• Reduce memory consumption: Since components are not re-instantiated, memory can be saved.
• Preserve component state: When a component is reused, its state is retained without reloading data or recalculating.

Usage scenarios

KeepAlive is usually used in the following scenarios:

• Components that require frequent switching.
• Components with large amounts of data or complex logic.
• Components that need to maintain state, even if the component is temporarily hidden.

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