How to implement page-level caching through Vue's keep-alive component

How to implement page-level caching through vue's keep-alive component

Introduction:
When using Vue for development, you often encounter situations where you need to cache the page to improve the loading speed of the page. and user experience. The keep-alive component in Vue can help us implement page-level caching, so that certain pages can retain their state and data when switching. This article will introduce how to use Vue's keep-alive component to implement page-level caching.

1. Keep-alive component introduction
   keep-alive is an abstract component provided by Vue and is used to cache other components. By wrapping components that need to be cached in keep-alive tags, these components can be cached and reused during switching.
2. How to use keep-alive
   Using the keep-alive component in Vue is very simple. You only need to add the tag outside the component that needs to be cached, and specify the component that needs to be cached. That’s it. For example:

in the above In the code, the component will be cached.

3. keep-alive life cycle method
   When using the keep-alive component, you may need to control the life cycle of the cached component. Vue provides two life cycle functions: activated and deactivated, which are used to control the behavior of components between cache and activation states.

activated: Called when the component is activated, that is, called when it goes from cache to activated state.
deactivated: Called when the component is cached, that is, called from activation to cached state.

<script><br>export default { <br> methods: {</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>onActivated() { // 组件被激活时的逻辑处理 }, onDeactivated() { // 组件被缓存时的逻辑处理 }</pre><div class="contentsignin">Copy after login</div></div><p>}<br>}<br></script>

In the above code, we add activated on the component and deactivated events to listen to events when components are activated and cached, and perform logical processing in the corresponding methods.

4. Cache the page
   When using the keep-alive component, we can control which pages are cached by adding the meta field to the routing configuration. For example:

const routes = [
{

path: '/',
name: 'Home',
component: Home,
meta: { keepAlive: true } // 需要进行缓存

},
{

path: '/about',
name: 'About',
component: About,
meta: { keepAlive: false } // 不需要进行缓存

}
]

In the above code, we added a meta field to the Home page and set it to keepAlive: true, which means that the page needs to be cached; for the About page, we set keepAlive: false, which means that it does not need to be cached.

Then, pass the meta field to the keep-alive component through the v-bind instruction on the component, and use v-if within the keep-alive component to cache the components that need to be cached. Judgment and caching:

In the above code , we pass the meta.keepAlive field to the keep-alive component through v-bind, and use v-if within the keep-alive component to determine whether the cache component is needed.

5. Example
   The following is a simple example code that demonstrates how to use the keep-alive component for page-level caching:

<script><br>export default {<br> computed: {</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>meta() { const matchedRouter = this.$route.matched[0]; return matchedRouter.meta; }</pre><div class="contentsignin">Copy after login</div></div><p> }<br>}<br></script>

In the above example, we obtain the meta field corresponding to the current route through the computed attribute and pass it to the keep-alive component through v-bind. In this way, the cache of the page can be controlled based on the meta field of the routing configuration.

Summary:
Through Vue’s keep-alive component, we can achieve page-level caching and improve page loading speed and user experience. By setting the components that need to be cached and the lifecycle methods that listen to cache and activation status, you can control the behavior of cached components more flexibly. I hope this article can help you understand and apply Vue's keep-alive component.

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