关于vuex模块化深层理解实例

先来目录层级

 store/index

import Vue from 'vue'
import Vuex from 'vuex'
import moduleA from './module/a'
import moduleB from './module/b'
Vue.use(Vuex)
const store = new Vuex.Store({
  state: {
    num: 1
  },
  getters: {
    doubleNum(state) {
      return state.num * 2
    }
  },
  mutations: {},
  actions: {},
  modules: {
    moduleA,
    moduleB
  },
});
export default store;

module/a/index

const moduleA = {
  namespaced: true,
  state: {
    countA: 4,
    name: null
  },
  mutations: {
    mutationsA(state, data) {
      console.log('mutationsA', state)
      state.countA += 1
    }
  },

  getters: {
    doubleCountA(state, getters, rootGetters, rootState) {
      console.log('gettersA', state)
      console.log('gettersA', getters)
      console.log('gettersA', rootGetters)
      console.log('gettersA', rootState)
      return state.countA * 2
    }
  },
  actions: {
    actionA({ state, commit, dispatch, getters, rootGetters, rootState }) {
      let params = {
        cp: '杰杰'
      }
      let params2 = {
        cp: '娜娜'
      }
      commit('moduleB/mutationsB', params, { root: true })
      dispatch('moduleB/actionB', params2, { root: true })
      console.log('actionA', state)
      console.log('commit', commit)
      console.log('rootGetters', rootGetters)
      console.log('rootState', rootState)
    },
  }
}
export default moduleA

module/b/index

const moduleB = {
  namespaced: true,
  state: { countB: 3 },
  mutations: {
    mutationsB(state, data) {
      state.countB += 1;
      console.log('mutationsB', data)
    }
  },

  getters: {
    doubleCountB(state, ) {

      return state.countB * 2
    }
  },
  actions: {
    actionB({ state, commit, dispatch, getters, rootGetters, rootState }, parmas) {
      console.log('actionB', parmas)
    },
  }
}
export default moduleB

模块化在组件下的...map调用简写

<template>
  <div>
    homes
  </div>
</template>

<script>
import { mapState, mapMutations, mapGetters, mapActions } from 'vuex';
export default {
  name: '',
  components: {},
  mixins: [],
  props: {},
  data() {
    return {};
  },
  watch: {},
  computed: {
    ...mapState({
      num: state => state.num,
      countA: state => state.moduleA.countA,
      countB: state => state.moduleB.countB
    }),
    ...mapGetters(['moduleA/doubleCountA', 'moduleB/doubleCountB'])
    // ...mapGetters('moduleA', ['doubleCountA'], 'moduleB', ['doubleCountB'])
  },
  created() {},
  mounted() {
    console.log(this.$store);
    this.mutationsA();
    this.actionA();
    console.log(this.countA);
    console.log('36', this['moduleA/doubleCountA']);
  },
  destroyed() {},
  methods: {
    ...mapMutations('moduleA', ['mutationsA']),
    ...mapActions('moduleA', ['actionA'])
  }
};
</script>
<style lang="less" scoped>
</style>

总结:

1> 

namespaced: true只有加上命名空间，模块化才成立，因为store的

2>想要在a模块的根目录下传参数什么的给b模块下的XX，就必须带上{ root: true }

3>目前只有getters和actions 可以访问到根目录的值，比如rootGetters, rootState

4>注意actions的参数写法为，那些所有vuex的值必须放在对象里面

 actionB({ state, commit, dispatch, getters, rootGetters, rootState }, parmas) {

而其他的3个没有对象这种写法