vue3缓存页面keep-alive及路由统一处理详解

<template>
	<div id="nav">
	    <router-link to="/">Home</router-link> |
	    <router-link to="/about">About</router-link>
  	</div>
	<!-- vue2.x配置 -->
   <keep-alive>
    <router-view v-if="$route.meta.keepAlive" />
  </keep-alive>
  <router-view v-if="!$route.meta.keepAlive"/>
</template>

<template>
	<div id="nav">
	    <router-link to="/">Home</router-link> |
	    <router-link to="/about">About</router-link>
  	</div>
  <!-- vue3.0配置 Component是固定写法-->
  <router-view v-slot="{ Component }">
    <keep-alive>
      <component :is="Component"  v-if="$route.meta.keepAlive"/>
    </keep-alive>
    <component :is="Component"  v-if="!$route.meta.keepAlive"/>
  </router-view> 
</template>

path: '/',
name: 'Home',
component: Home,
meta:{
  keepAlive: true
}

...
需要部分刷新的数据：<input type="text" v-model="newStr" />
...
data() {
  return {
    newStr: "2",
  };
},
mounted() {
  console.log("执行了mounted方法");
  this.newStr = "3";
},
activated() {
  console.log("执行了actived方法。。。");
  this.newStr = "4";
}

  // 使用组件内守卫，对离开页面事件做一些操作
  // to为即将跳转的路由，from为上一个页面路由
  beforeRouteEnter(to, from, next) {
    to.meta.keepAlive = true;
    // 路由继续跳转
    next();
  }

<router-view v-slot="{ Component }">
  <keep-alive include="testKA">
    <component :is="Component"/>
  </keep-alive>
</router-view>

export default {
    name:'testKA',// keep-alive中include属性匹配组件name
    data() {return {}},
    activated() {
        // keepalive缓存的页面每次进入都会进行的生命周期
    },
}

<!-- 逗号分隔字符串 -->
<keep-alive include="a,b">
  <component :is="view"></component>
</keep-alive>

<!-- 正则表达式 (使用 `v-bind`) -->
<keep-alive :include="/a|b/">
  <component :is="view"></component>
</keep-alive>

<!-- 数组 (使用 `v-bind`) -->
<keep-alive :include="['a', 'b']">
  <component :is="view"></component>
</keep-alive>

state: {
  keepAlives:[]
},
mutations: {
  SET_KEEP_ALIVE(state,params) {
    state.keepAlives = params
  }
},
getters:{
  keepAlive:function(state){
    return state.keepAlives
  }
}

<template>
  <div id="nav">
    <router-link to="/bbb">BBB</router-link> |
    <router-link to="/home">Home</router-link> |
    <router-link to="/about">About</router-link>
  </div>
  <router-view v-slot="{ Component }">
    <keep-alive :include="keepAlive">
      <component :is="Component"/>
    </keep-alive>
  </router-view>
</template>
<script>
  export default{
    computed:{
      keepAlive(){
        return this.$store.getters.keepAlive
      }
    }
  }
</script>

// 使用组件内守卫，对离开页面事件做一些操作
// to为即将跳转的路由，from为上一个页面路由
beforeRouteEnter(to, from, next) {
  next(vm=>{
    if(from.path == "/bbb"){
      vm.$store.commit("SET_KEEP_ALIVE",["Home"])
    }
  });
},
beforeRouteLeave(to, from, next) {
  if (to.path == "/about") {
    console.log("将要跳转/about页面...")
  } else {
    console.log("将要跳转非/about页面...")
    this.$store.commit("SET_KEEP_ALIVE",[])
  }
  // 路由继续跳转
  next();
}