Vue2.0 provides a keep-alive component for caching components to avoid loading the corresponding components multiple times and reduce performance consumption.
Keep-aliv is a built-in component of vue. js. It can store non-active component instances in the memory instead of directly destroying them. It is an abstract component and will not be rendered to the real Dom, it does not appear in the parent component chain.
It has two lifecycles:
It provides the include and exclude attributes, allowing the component to cache with conditions.
Keep-alive key
?| 123456789101112131415161718192021222324252627282930313233343536373839 | <!DOCTYPE html><html><head> <title></title> <script type="text/javascript" src="./vue.js"></script></head><body> <div id="app"> <keep-alive> <child-component key="1" v-if="seen" name="1"></child-component> <child-component key="2" v-if="!seen" name="2"></child-component> </keep-alive> <button @click="toggle">toggle</button> </div> <script type="text/javascript"> Vue.component(‘child-component‘, { template: `<input type="text" placeholder="enter">`, data() { return {} }, props: ["name"], mounted() { console.log(`${this.name} mounted`) } }) const vm = new Vue({ el: "#app", data: { seen: true }, methods: { toggle() { this.seen = !this.seen; } } }) </script></body></html> |
Key indicates that the ID element is no longer reused. Note that key is a reserved attribute in vue and cannot be passed as a prop to the sub-component. Otherwise, the Vue error is displayed on the console.
However, the keep-alive identifier does not create component instances repeatedly, that is, only one created mounted event is triggered,
The two can be used to manage the reuse of components in a more precise manner.
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Implementation principle of key keep-alive in vue
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