模块化+命名空间

1.目的：为了让代码更好维护，让多种数据分类更加明确

2.修改src/store/index.js为了解决不同模块命名冲突的问题，将不同模块的namespaced:true，之后在不同页面中引入getter actions mutations state，需要加上所属的模块名

const countAbout={
    namespaced:true,//开启命名空间
    actions:{},
    mutations:{},
    state:{},
    getters:{},
}
const personAbout={
    namespaced:true,//开启命名空间
    actions:{},
    mutations:{},
    state:{},
    getters:{},
}

// 暴露/导出store
export default new Vuex.Store({
    modules:[
        countAbout,
        personAbout
    ]
})

3.开启命名空间后，组件中读取state数据

//方式一：自己直接读取
this.$store.personAbout.list
//方式二：借助mapState读取
...mapState('countAbout',['sum','school','subject']

4.开启命名空间后，组件中读取getters数据

//方式一：自己直接读取
this.$store.getters['personAbout/firstPersonName']
//方式二：借助mapGetters读取
...mapGetters('countAbout',['bigSum'])

5.开启命名空间后，组件中调用dispatch

//方式一：自己直接dispatch
this.$store.dispatch('personAbout/addPersonWang',person)
//方式二：借助mapActions
...mapActions('countAbout',{incrementOdd:'jiaOdd',incrementWait:'jiaWait'})

6.开启命名空间后，组件中调用commit

//方式一：自己直接commit
this.$store.commit('personAbout/ADD_PERSON',person)
//方式二：借助mapMutations
...mapMutations('countAbout',{increment:'JIA',decrement:'JIAN'})

src/store/index.js

//引入vuex
import Vue from 'vue'
import Vuex from 'vuex'
Vue.use(Vuex)
import countOptions from './count'
import personOptions from './person'

// 暴露/导出store
export default new Vuex.Store({
    modules: {
        countAbout:countOptions,
        personAbout:personOptions
    }
})

src/store/count.js

export default {
    namespaced: true,//开启命名空间
    actions: {
        // context相当于精简版的$store
        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)
        }
    },
    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
        }
    },
    state: {
        sum: 0,   //当前的和
        school: '黑马',
        subject: '前端',
    },
    getters: {
        bigSum(state) {
            return state.sum * 10
        }
    },
}

src/store/person.js

import axios from 'axios'
import { nanoid } from 'nanoid'
export default {
    namespaced: true,//开启命名空间
    actions: {
        addPersonWang(context, value) {
            if (value.name.indexOf('王') === 0) {
                context.commit('ADD_PERSON', value)
            } else {
                alert('添加的人必须姓王！')
            }
        },
        addPersonServer(context) {
            axios.get('http://api.uixsj.cn/hitokoto/get?type=social').then(
                response => {
                    context.commit('ADD_PERSON', { id: nanoid(), name: response.data })
                },
                error => {
                    alert(error.message)
                }
            )
        }
    },
    mutations: {
        ADD_PERSON(state, value) {
            console.log('mutations中的ADD_PERSON被调用了');
            state.personList.unshift(value)
        }
    },
    state: {
        personList: [{
            id:'001',
            name:'张三'
        }]
    },
    getters: {
        firstPersonName(state) {
            return state.personList[0].name
        }
    },
}

src/components/Count.vue

src/components/Person.vue

src/App.vue

src/main.js

import Vue from 'vue'
import App from './App.vue'
//引入插件
import vueResource from 'vue-resource'

import store from './store'
Vue.config.productionTip = false
//使用插件
Vue.use(vueResource)

//创建vm
new Vue({
    el: '#app',
    render: h => h(App),
    store,
    beforeCreate(){
        Vue.prototype.$bus=this //安装全局事件总线
    }
})