Vuex组件间共享数据

案例的目录结构如下图：

 

1、简单版Vuex

store/index.js

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

const actions = {
   jia(context, value){
       context.commit('JIA', value)
   }
}

const mutations = {
   JIA(state, value){
        state.sum += value
   },
   JIAN(state, value){
       state.sum -= value
   }
}

const state = {
    sum: 0
}

const getters = {
    bigSum(state){
        return state.sum * 10
    }
}

export default new Vuex.Store({
    actions,
    mutations,
    state,
    getters
})

main.js

import Vue from 'vue'
import App from './App.vue'
import ElementUI from 'element-ui'; //引入ElementUI组件库
import 'element-ui/lib/theme-chalk/index.css'; //引入ElementUI全部样式
import store from './store'

Vue.config.productionTip = false
Vue.use(ElementUI) //应用ElementUIWW

//按需引入ElementUI组件
// import { Row,Button,DatePicker,Table,TableColumn,Pagination,Loading } from 'element-ui';
// Vue.component(Row.name, Row);
// Vue.component(Button.name, Button);
// Vue.component(DatePicker.name, DatePicker);
// Vue.component(Table.name, Table);
// Vue.component(TableColumn.name, TableColumn);
// Vue.component(Pagination.name, Pagination);
// Vue.use(Loading.directive);

new Vue({
  render: h => h(App),
  store: store
}).$mount('#app')

/*
new Vue({
  el: "#app",
  template: "",
  components:{
    App: App
  }
})*/

App.vue

views/CalResult.vue

效果如下图：

2、使用mapAction和mapMutations

App.vue

3、模块化

store/modules/caculate.js

export default {
    namespaced: true,
    actions:{
        jia(context, value){
            context.commit('JIA', value)
        }
    },
    mutations:{
        JIA(state, value){
            state.sum += value
       },
       JIAN(state, value){
           state.sum -= value
       }
    },
    state:{
        sum: 0
    },
    getters:{
        bigSum(state){
            return state.sum * 10
        }
    }
}

注意：namespaced: true这个配置必须加上，否则报错[vuex] module namespace not found in xxx

store/index.js

import Vue from 'vue'
import Vuex from 'vuex'
import caculate from './modules/caculate'

Vue.use(Vuex)

export default new Vuex.Store({
    modules:{
        caculate
    }
})

main.js

import Vue from 'vue'
import App from './App.vue'
import ElementUI from 'element-ui'; //引入ElementUI组件库
import 'element-ui/lib/theme-chalk/index.css'; //引入ElementUI全部样式
import store from './store'

Vue.config.productionTip = false
Vue.use(ElementUI) //应用ElementUIWW

//按需引入ElementUI组件
// import { Row,Button,DatePicker,Table,TableColumn,Pagination,Loading } from 'element-ui';
// Vue.component(Row.name, Row);
// Vue.component(Button.name, Button);
// Vue.component(DatePicker.name, DatePicker);
// Vue.component(Table.name, Table);
// Vue.component(TableColumn.name, TableColumn);
// Vue.component(Pagination.name, Pagination);
// Vue.use(Loading.directive);

new Vue({
  render: h => h(App),
  store: store
}).$mount('#app')

/*
new Vue({
  el: "#app",
  template: "",
  components:{
    App: App
  }
})*/

App.vue

views/CalResult.vue