VUE3 entry development: using keep-alive for component caching

Vue is a very popular front-end framework, and Vue3 is the latest version of Vue. In Vue3, using keep-alive for component caching is a very useful feature that can greatly improve the performance of the website.

keep-alive is an abstract component in Vue3, which can cache components to prevent them from being repeatedly created and destroyed during frequent switching. This feature is very useful in some component scenarios that require frequent switching, such as carousels, tabs, Dialogs, etc.

Let’s introduce how to use keep-alive for component caching in Vue3.

1. Basic usage of keep-alive

1. Using keep-alive component in Vue3

To use keep-alive, you need to Add the 7c9485ff8c3cba5ae9343ed63c2dc3f7 tag on the root element of the component, as shown below:

<template>
  <keep-alive>
    <component :is="selected"></component>
  </keep-alive>
</template>

2. Component cache

After adding the keep-alive tag, the currently displayed Components will be cached. When a component is switched, Vue3 will give priority to loading the component from the cache instead of re-creating the component, thereby improving website performance.

2. Advanced usage of keep-alive

1. Cache strategy configuration

By default, keep-alive will cache all components, but Sometimes we only want to cache specific components. At this time we can use the include and exclude attributes to configure the cache strategy.

In the template, we can use the include attribute to configure the components that need to be cached:

<template>
  <keep-alive include="component-a, component-b">
    <component :is="selected"></component>
  </keep-alive>
</template>

In this way, only components named component-a and component-b will be cached.

In the template, we can also use the exclude attribute to configure components that do not need to be cached:

<template>
  <keep-alive exclude="component-c">
    <component :is="selected"></component>
  </keep-alive>
</template>

In this way, the component named component-c will not be cached.

2. Cache life cycle

In the life cycle of the cache component, Vue3 provides some hook functions that we can use to monitor the life cycle of the cache component.

activated is a hook function that is triggered when the component is activated. The activated hook function is triggered when the component is loaded from the cache. We can perform some operations on cache components in activated.

deactivated is a hook function that is triggered when the component is deactivated. The deactivated hook function is triggered when the component is removed from the current cache or switched to another component.

You can define these two hook functions in the component to monitor the life cycle of the cache component, as shown below:

<script>
export default {
  activated() {
    // 在缓存组件被激活时进行一些操作
  },
  deactivated() {
    // 在缓存组件被停用时进行一些操作
  }
}
</script>

3. Summary

Use keep-alive for components Caching can greatly improve the performance of the website. Vue3 provides some advanced usage, including cache policy configuration and cache life cycle monitoring. We can use these features flexibly according to our needs to optimize the performance of the website.

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