vuex的求和案例和mapstate，mapmutations，mapgetters

main.js

import Vue from 'vue'
import App from './App.vue'
//引入vuex
import Vuex from 'vuex'
//引入store
import store from './store/index'Vue.config.productionTip = falsenew Vue({el:"#app",render: h => h(App),store,beforeCreate(){Vue.prototype.$bus = this}
})

App.vue

<template><div class="container"><Count/></div>
</template><script>import Count from './components/Count'export default {name:'App',components:{Count},mounted(){console.log('App',this)}}
</script>

count.vue

<template><div><h1>当前求和为：{{$store.state.sum}}</h1><h3>当前求和放大10倍为；{{$store.getters.bigSum}}</h3><select v-model.number="n"><option value="1">1</option><option value="2">2</option><option value="3">3</option></select><button @click="increment">+</button><button @click="decrement">-</button><button @click="incrementOdd">当前求和为奇数再加</button><button @click="incrementWait">等一等再加</button></div>
</template><script>export default {name:'Count',data() {return {n:1, //用户选择的数字}},methods: {increment(){this.$store.dispatch('jia',this.n)},decrement(){this.$store.dispatch('jian',this.n)},incrementOdd(){this.$store.dispatch('jiaOdd',this.n)},incrementWait(){this.$store.dispatch('jiaWait',this.n)	},},mounted(){console.log('Count',this.$store)}}
</script><style>button{margin-left: 5px;}
</style>

store/index.js

//该文件用于创建VUex中最为核心的storeimport Vue from 'vue'//引入Vuex
import Vuex from 'vuex'
//应用vuex插件
Vue.use(Vuex)//准备actions -用于响应组件中的动作
const actions ={jia(context,value){console.log('actions中的jia被调用了')context.commit('JIA',value)},jian(context,value){console.log('actions中的jian被调用了')context.commit('JIAN',value)},jiaOdd(context,value){console.log('actions中的jiaOdd被调用了')if(context.state.sum % 2){context.commit('JIA',value)} },jiaWait(context,value){console.log('actions中的jiaWait被调用了')setTimeout(() => {context.commit('JIA',value)}, 500);}
}//准备mutations -用于操作数据（state）
const mutations={JIA(state,value){console.log('mutations中的JIA被调用了')state.sum +=value},JIAN(state,value){console.log('mutations中的JIAN被调用了')state.sum -=value},
}//准备state -用于存储数据
const state ={sum:0 //当前的和 
}//准备getters--用于将state中的数据进行加工
const getters={bigSum(state){return state.sum*10}
}//创建并暴露store
export default new Vuex.Store({actions,mutations,state,getters
})

getters配置项

当一部分的数据进行一些变化时，可以通过getters的属性来对一部分的数据进行变化

mapState，mapGetters

// sum(){// 	return this.$store.state.sum// },// school(){// 	return this.$store.state.school// },// subject(){// 	return this.$store.state.subject// },// bigSum(){// 	return this.$store.getters.bigSum// },//借助mapState生成计算属性，从state读取数据（对象写法）//  ...mapState({he:'sum',xuexiao:'school',xueke:'subject'})//借助mapState生成计算属性，从state中读取数据（数组写法）...mapState(['sum','school','subject']),...mapGetters(['bigSum'])

通过计算属性来改变。

mapMutations

在methods方法下

            // increment(){// 	this.$store.commit('JIA',this.n)// },// decrement(){// 	this.$store.commit('JIAN',this.n)// },//借助mapMutations生成对应的方法，方法中会调用commit去联系mutaions...mapMutations({increment:'JIA',decrement:'JIAN'}),

使用之后的整个代码

main.js和App.vue时不变的

index.js

//该文件用于创建VUex中最为核心的storeimport Vue from 'vue'//引入Vuex
import Vuex from 'vuex'
//应用vuex插件
Vue.use(Vuex)//准备actions -用于响应组件中的动作
const actions ={jia(context,value){console.log('actions中的jia被调用了')context.commit('JIA',value)},jian(context,value){console.log('actions中的jian被调用了')context.commit('JIAN',value)},jiaOdd(context,value){console.log('actions中的jiaOdd被调用了')if(context.state.sum % 2){context.commit('JIA',value)} },jiaWait(context,value){console.log('actions中的jiaWait被调用了')setTimeout(() => {context.commit('JIA',value)}, 500);}
}//准备mutations -用于操作数据（state）
const mutations={JIA(state,value){console.log('mutations中的JIA被调用了')state.sum +=value},JIAN(state,value){console.log('mutations中的JIAN被调用勒')state.sum -=value}}//准备state -用于存储数据
const state ={sum:0, //当前的和 school:'尚硅谷',subject:'前端'
}const getters={bigSum(state){return state.sum*10}
}//创建并暴露store
export default new Vuex.Store({actions,mutations,state,getters
})

count.vue

<template><div><h1>当前求和为：{{sum}}</h1><h3>当前求和放大10倍为:{{bigSum}}</h3><h3>我在{{school}} 学习{{subject}}</h3><select v-model.number="n"><option value="1">1</option><option value="2">2</option><option value="3">3</option></select><button @click="increment(n)">+</button><button @click="decrement(n)">-</button><button @click="incrementOdd(n)">当前求和为奇数再加</button><button @click="incrementWait(n)">等一等再加</button></div>
</template><script>import {mapActions, mapGetters, mapMutations, mapState} from 'vuex'export default {name:'Count',data() {return {n:1, //用户选择的数字}},computed:{// sum(){// 	return this.$store.state.sum// },// school(){// 	return this.$store.state.school// },// subject(){// 	return this.$store.state.subject// },// bigSum(){// 	return this.$store.getters.bigSum// },//借助mapState生成计算属性，从state读取数据（对象写法）//  ...mapState({he:'sum',xuexiao:'school',xueke:'subject'})//借助mapState生成计算属性，从state中读取数据（数组写法）...mapState(['sum','school','subject']),...mapGetters(['bigSum'])},methods: {// increment(){// 	this.$store.commit('JIA',this.n)// },// decrement(){// 	this.$store.commit('JIAN',this.n)// },//借助mapMutations生成对应的方法，方法中会调用commit去联系mutaions...mapMutations({increment:'JIA',decrement:'JIAN'}),// incrementOdd(){// 		this.$store.dispatch('jiaOdd',this.n)// },// incrementWait(){// 		this.$store.dispatch('jiaWait',this.n)	// },//...mapActions({incrementOdd:'jiaOdd',incrementWait:'jiaWait'})},mounted(){const x =mapState({he:'sum',xuexiao:'school',xueke:'subject'})console.log(x)}}
</script><style>button{margin-left: 5px;}
</style>

多组件共享数据

即以index.js中的属性为公共汽车。来通过调用其中的属性来实现一个数据间的共享

index.js(这个区域主要是添加了增加人员的方法，在mutations处)

//该文件用于创建VUex中最为核心的storeimport Vue from 'vue'//引入Vuex
import Vuex from 'vuex'
//应用vuex插件
Vue.use(Vuex)//准备actions -用于响应组件中的动作
const actions ={jia(context,value){console.log('actions中的jia被调用了')context.commit('JIA',value)},jian(context,value){console.log('actions中的jian被调用了')context.commit('JIAN',value)},jiaOdd(context,value){console.log('actions中的jiaOdd被调用了')if(context.state.sum % 2){context.commit('JIA',value)} },jiaWait(context,value){console.log('actions中的jiaWait被调用了')setTimeout(() => {context.commit('JIA',value)}, 500);}
}//准备mutations -用于操作数据（state）
const mutations={JIA(state,value){console.log('mutations中的JIA被调用了')state.sum +=value},JIAN(state,value){console.log('mutations中的JIAN被调用勒')state.sum -=value},ADD_PERSON(state,value){console.log('mutations中的ADD_PERSON被调用勒')state.personList.unshift(value)}}//准备state -用于存储数据
const state ={sum:0, //当前的和 school:'尚硅谷',subject:'前端',personList:[{id:'001',name:'张三'}]
}const getters={bigSum(state){return state.sum*10}
}//创建并暴露store
export default new Vuex.Store({actions,mutations,state,getters
})

Person.vue

<template><div><h1>人员列表</h1><h3 style="color:blue">上方组件的求和为{{sum}}</h3><input type="text" placeholder="请输入名字" v-model="name"><button @click="add">添加</button><ul><li v-for="p in personList" :key="p.id">{{p.name}}</li></ul></div>
</template><script>
import { nanoid } from 'nanoid'export default {name:'Person',data(){return{name:''}},computed:{personList(){return this.$store.state.personList},sum(){return this.$store.state.sum}},methods:{add(){const personObj={id:nanoid(),name:this.name}this.$store.commit('ADD_PERSON',personObj)this.name=''}}
}
</script>

count.vue(这里主要是在mapstate属性中添加我要获取的personList，然后在展示处展示)

<template><div><h1>当前求和为：{{sum}}</h1><h3>当前求和放大10倍为:{{bigSum}}</h3><h3>我在{{school}} 学习{{subject}}</h3><h3 style="color:red">下方组件的总人数是：{{personList.length}}</h3><select v-model.number="n"><option value="1">1</option><option value="2">2</option><option value="3">3</option></select><button @click="increment(n)">+</button><button @click="decrement(n)">-</button><button @click="incrementOdd(n)">当前求和为奇数再加</button><button @click="incrementWait(n)">等一等再加</button></div>
</template><script>import {mapActions, mapGetters, mapMutations, mapState} from 'vuex'export default {name:'Count',data() {return {n:1, //用户选择的数字}},computed:{// sum(){// 	return this.$store.state.sum// },// school(){// 	return this.$store.state.school// },// subject(){// 	return this.$store.state.subject// },// bigSum(){// 	return this.$store.getters.bigSum// },//借助mapState生成计算属性，从state读取数据（对象写法）//  ...mapState({he:'sum',xuexiao:'school',xueke:'subject'})//借助mapState生成计算属性，从state中读取数据（数组写法）...mapState(['sum','school','subject','personList']),...mapGetters(['bigSum'])},methods: {// increment(){// 	this.$store.commit('JIA',this.n)// },// decrement(){// 	this.$store.commit('JIAN',this.n)// },//借助mapMutations生成对应的方法，方法中会调用commit去联系mutaions...mapMutations({increment:'JIA',decrement:'JIAN'}),// incrementOdd(){// 		this.$store.dispatch('jiaOdd',this.n)// },// incrementWait(){// 		this.$store.dispatch('jiaWait',this.n)	// },//...mapActions({incrementOdd:'jiaOdd',incrementWait:'jiaWait'})},mounted(){const x =mapState({he:'sum',xuexiao:'school',xueke:'subject'})console.log(x)}}
</script><style>button{margin-left: 5px;}
</style>