总结：keep-alive 是Vue的内置组件，能在组件切换过程中将状态保留在内存中，防止重复渲染DOM。结合vue-router中使用，可以缓存某个view的整个内容。
1.在App.vue中添加配置：
<!-- 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>
2.在需要缓存的页面，配置路由
{ path: '/', name: 'headers', component: headers, meta:{ keep_alive:true } },
3.使用，子组件header.vue
<template>
<div>
<h5>header</h5>
<button @click="handclick"></button>
<input type="text" v-model="msg">
</div>
</template>
<script>
export default {
name:"header",
data(){
return{
msg:"",
}
},
methods:{
handclick(){
let that=this;
this.msg="里斯",
setTimeout(function(){
that.$router.push('/details')
},2000);
}
}
}
</script>
<style>
button{
height: 50px;
50px;
background-color: red;
}
</style>
4.父组件 detail.vue
<template>
<div>
<h5>我是detail页面</h5>
<keep-alive>
<head></head>
</keep-alive>
<button @click="goheader">跳转会header界面</button>
</div>
</template>
<script>
import header from "./header.vue";
export default {
components: {
header
},
data() {
return {};
},
methods: {
goheader() {
this.$router.push({ name: "headers" });
}
}
};
</script>
<style>
</style>
5.include/exclude两个属性 可以针对性缓存相应的组件
include - 字符串或正则表达式。只有名称匹配的组件会被缓存。
exclude - 字符串或正则表达式。任何名称匹配的组件都不会被缓存。
<keep-alive include="a,b">
<component :is="view"></component>
</keep-alive><keep-alive :include="includedComponents"> <router-view></router-view> </keep-alive>