Detailed explanation of how to use keep-alive in vue
This time I will bring you a detailed explanation of how to use keep-alive in Vue. What are the precautions for using keep-alive in Vue? Here are practical cases, let’s take a look.
1. The role and benefits of keep-alive
In e-commerce related projects, when we enter the list page for the first time I need to request data. When I enter the details page from the list page, I need to request the data even if the details page is not cached, and then return to the list page. At this time, we use keep-alive to cache the component to prevent secondary rendering, which will save a lot of money. performance.
2. Basic usage of keep-alive
In app.vue
<!-- 缓存所有的页面 --> <keep-alive> <router-view v-if="$route.meta.keep_alive"></router-view> </keep-alive> <router-view v-if="!$route.meta.keep_alive"></router-view>
The component content that needs to be cached is directly Add in the router:
meta: {
keepAlive: true // true 表示需要使用缓存 false表示不需要被缓存
}3.keep-alive life cycle
When keep-alive is introduced, the page first Upon entry, the trigger sequence of the hook is created-> mounted-> activated, and deactivated is triggered when exiting. When entering again (forward or backward), only activated is triggered.
Let’s take a look at the usage problems and solutions of keep-alive in vue
Problem description
In business development, there will be scenarios where routing jumps but data needs to be retained when returning; vue provides keep-alive to handle
Solution
Return The dom does not allow it to be refreshed, and wraps a layer outside the vue-view. When keep-alive is introduced, the page is entered for the first time, the trigger sequence of the hook is created-> mounted-> activated, and deactivated is triggered when exiting. When entering again (forward or backward), only activated is triggered.
Event mounting methods, etc., which are only executed once are placed in mounted; methods that are executed each time the component is entered are placed in activated;
Whether to wrap keep-alive can be configured through parameters;
<keep-alive>
<router-view v-if="$route.meta.keepAlive" style="min-height:100%"></router-view>
</keep-alive>
<router-view v-if="!$route.meta.keepAlive" style="min-height:100%"></router-view>
//不需要刷新的路由配置里面配置 meta: {keepAlive: true}, 这个路由则显示在上面标签；
//需要刷新的路由配置里面配置 meta: {keepAlive: false}, 这个路由则显示在下面标签；I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
Recommended reading:
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The above is the detailed content of Detailed explanation of how to use keep-alive in vue. For more information, please follow other related articles on the PHP Chinese website!
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