How to use cache in vue
This time I will show you how to use cache in Vue, and what are the precautions for using cache in Vue. The following is a practical case, let's take a look.
keep-alive Introduction
keep-alive is a built-in component of Vue that allows included components to retain state or avoid re-rendering. Usage is also very simple:<keep-alive> <component> <!-- 该组件将被缓存！ --> </component> </keep-alive>
props
##include - String or regular expression , only matching components will be cachedexclude - string or regular expression
, any matching components will not be cached// 组件 a
export default {
name: 'a',
data () {
return {}
}
}
<keep-alive include="a">
<component>
<!-- name 为 a 的组件将被缓存！ -->
</component>
</keep-alive>可以保留它的状态或避免重新渲染
<keep-alive exclude="a">
<component>
<!-- 除了 name 为 a 的组件都将被缓存！ -->
</component>
</keep-alive>可以保留它的状态或避免重新渲染
<keep-alive include="test-keep-alive">
<!-- 将缓存name为test-keep-alive的组件 -->
<component></component>
</keep-alive>
<keep-alive include="a,b">
<!-- 将缓存name为a或者b的组件，结合动态组件使用 -->
<component :is="view"></component>
</keep-alive>
<!-- 使用正则表达式，需使用v-bind -->
<keep-alive :include="/a|b/">
<component :is="view"></component>
</keep-alive>
<!-- 动态判断 -->
<keep-alive :include="includedComponents">
<router-view></router-view>
</keep-alive>
<keep-alive exclude="test-keep-alive">
<!-- 将不缓存name为test-keep-alive的组件 -->
<component></component>
</keep-alive>
router-view is also a component. If it is directly wrapped in keep-alive, all
view components matching the path will be cached: <keep-alive>
<router-view>
<!-- 所有路径匹配到的视图组件都会被缓存！ -->
</router-view>
</keep-alive>
What should I do if I only want a certain component in the router-view to be cached? ?
Use include/exclude
Add the router.meta attributeUse include/exclude
// 组件 a
export default {
name: 'a',
data () {
return {}
}
}
<keep-alive include="a">
<router-view>
<!-- 只有路径匹配到的视图 a 组件会被缓存！ -->
</router-view>
</keep-alive>exclude The example is similar.
Disadvantages: Need to know the name of the component, not a good choice when the project is complex
Add router.meta attribute
// routes 配置
export default [
{
path: '/',
name: 'home',
component: Home,
meta: {
keepAlive: true // 需要被缓存
}
}, {
path: '/:id',
name: 'edit',
component: Edit,
meta: {
keepAlive: false // 不需要被缓存
}
}
]
<keep-alive>
<router-view v-if="$route.meta.keepAlive">
<!-- 这里是会被缓存的视图组件，比如 Home！ -->
</router-view>
</keep-alive>
<router-view v-if="!$route.meta.keepAlive">
<!-- 这里是不被缓存的视图组件，比如 Edit！ -->
</router-view>Advantages: No need to enumerate the components that need to be Cache component name
[Salt]Use router.meta to expand
Suppose there are 3 routes: A, B, C.
Requirements:
Default display A
B jumps to A, A does not refreshC jumps to A, A refreshes
Implementation method
In A Set the meta attribute in the route:
{
path: '/',
name: 'A',
component: A,
meta: {
keepAlive: true // 需要被缓存
}
}Set beforeRouteLeave in the B component:
export default {
data() {
return {};
},
methods: {},
beforeRouteLeave(to, from, next) {
// 设置下一个路由的 meta
to.meta.keepAlive = true; // 让 A 缓存，即不刷新
next();
}
};Set beforeRouteLeave in the C component:
export default {
data() {
return {};
},
methods: {},
beforeRouteLeave(to, from, next) {
// 设置下一个路由的 meta
to.meta.keepAlive = false; // 让 A 不缓存，即刷新
next();
}
};This way, B can return to A. A does not refresh; C returns to A and refreshes.
SummaryThe routing method is good, you don’t need to worry about which page jumps to, just router.go(-1) can go back , no additional parameters are required.
However, in non-single-page applications, keep-alive cannot be cached effectively = =
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to php Chinese Other related articles online!
Recommended reading:
Instructions for newbies to vue
##Detailed steps for calling child components from Angular parent components
The above is the detailed content of How to use cache in vue. For more information, please follow other related articles on the PHP Chinese website!
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