How to reasonably use keep-alive for component caching in vue

Vue.js is a popular front-end framework that uses component development to allow us to better manage and reuse code. Among them, thekeep-alivecomponent is a very practical function provided by Vue.js, which can help us optimize page performance. In this article, we will discuss how to properly usekeep-alivefor component caching.

What is thekeep-alivecomponent?

In Vue.js,keep-aliveis an abstract component that can be wrapped around dynamic components to achieve the effect of component caching. When the component wrapped in it is switched,keep-alivewill cache it instead of destroying it, so that the next time you switch to the component again, there is no need to re-render and initialize it, thus improving the response of the page. Speed and user experience.

How to use thekeep-alivecomponent?

Using thekeep-alivecomponent is very simple, just wrap the component that needs to be cached in thetag. Here is an example:

In the above example, we have created a parent component that contains two dynamic components. When the button is clicked, switches the display between two dynamic components. We wrap these two dynamic components inkeep-aliveto implement component caching.

Notes

When using thekeep-alivecomponent, there are some precautions that we need to pay attention to:

Useincludeandexcludeproperties

keep-aliveprovidesincludeandexcludeproperties for specifying components that need to be cached and components that need to be excluded from cache. Both properties can accept a string or an array of regular expressions.

In the above example, we specified theComponentAcomponents that need to be cached and the components that match theComponentBregular expression, and excludedComponentBcomponents.

Use themaxattribute

keep-alivealso provides themaxattribute to specify the component instance that needs to be cached Quantity limit. When the number of cached component instances reaches the upper limit, the oldest cached component instance will be destroyed.

In the example above, we limited caching to a maximum of 5 component instances.

Useactivatedanddeactivatedhook functions

When a cached component is reactivated, it can be passedactivatedHook function to perform some operations. Similarly, when a cached component is disabled, some actions can be performed through thedeactivatedhook function.

In the above example, when a cached component is activated or disabled, thehandleActivatedandhandleDeactivatedmethods will be triggered respectively.

Summary

By rational use ofkeep-alivecomponents, we can achieve component caching and improve page performance and user experience. We can specify the components that need to be cached or excluded through theincludeandexcludeattributes, and control the upper limit of the number of cached component instances through themaxattribute. In addition, we can also use theactivatedanddeactivatedhook functions to perform some custom operations.

I hope this article will help you understand how to properly usekeep-alivefor component caching. Wishing you better results in your Vue.js development!

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