VueX写法对比

原始写法

<template>
    <div>
        <h1>当前求和为: {{ sum }}</h1>
        <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: 'Category',
    data() {
        return {
            n: 1,
            sum: 0
        }
    },
    methods: {
        increment() {
            this.sum += this.n;
        },
        decrement() {
            this.sum -= this.n;
        },
        incrementOdd() {
            if (this.sum % 2) {
                this.sum += this.n;
            }
        },
        incrementWait() {
            setTimeout(() => {
                this.sum += this.n;
            }, 500)
        },
    },
}
</script>

Vuex写法

<script>
import {mapGetters, mapState,mapMutations,mapActions} from 'vuex'
export default {
    name: 'Category',
    data() {
        return {
            n: 1,

        }
    },
    computed: {

        // 此处方法相当于上面方法,从state中取数据 对象写法
        // ...mapState({sum:'sum',school:'school',subject:'subject'}),
        
        // 数组写法,需要计算属性和his.$store.state.sum中sum 名字相同
        ...mapState('countOption',['sum','school','subject']),
        ...mapState('personOption',['personList']),

        // 对象写法
        // ...mapGetters({addAll:'addAll'}),
        // 数组写法
        ...mapGetters('countOption',['addAll'])
    },
    methods: {
        // 在mapMutations中生成对应方法,方法中会调用commit去调用$mutation 对象写法
        ...mapMutations('countOption',{increment:'ADDM',decrement:'ADDL'}),

        // 对象写法 参数要在调用端添加
        ...mapActions('countOption',{incrementOdd:'addLM',incrementWait:'addLMW'})
    },
    mounted() {
    },
}

引入Vuex

main.js
// 引入store 如果填写的是vue可以认识的名称可以忽略不写
import store from './store/index'