Vuex modules模式下mapState/mapMutations的操作实例

当我们使用 Vuex 实现全局状态维护时，可能需要将状态值划分多个模块，比如一些 root 级的用户登录状态，token，用户级的用户信息，购物车级的购物车信息。

下面我们实例演示下如何在多模块下使用 mapState/mapMutations。

modules 只作用于属性，属性会归属在相应的模块名的命名空间下。
mutations, actions, getter 没有命名空间的限定，所以要保证全局的唯一性，否则后者会覆盖前者

store/index.js

import Vue from 'vue'
import Vuex from 'vuex'
import user from './user'
import order from './order'
Vue.use(Vuex)
const store = new Vuex.Store({
  modules: {
    user,
    order
  },
  state: {
    hasLogin: false,
    token: ""
  },
  mutations: {
    setHasLogin(state, hasLogin) {
      state.hasLogin = hasLogin
    },
    setToken(state, token) {
      state.token = token
    }
  }
})
export default store

store/user.js

const state = {
  name: "sqrtcat",
  age: 25
}
const mutations = {
  setUserName(state, name) {
    state.name = name
  },
  setUserAge(state, age) {
    state.age = age
  }
}
const actions = {
}
const getters = {
}
export default {
  state,
  mutations,
  actions,
  getters
}

store/order.js

const state = {
  name: "cart",
  count: 0
}
const mutations = {
  setOrderName(state, name) {
    state.name = name
  },
  setOrderCount(state, count) {
    state.count = count
  }
}
const actions = {
}
const getters = {
}
export default {
  state,
  mutations,
  actions,
  getters
}

Vue 引入

import Vue from 'vue'
import App from './App'
import store from './store'
Vue.config.productionTip = false
Vue.prototype.$store = store // 注入仓库
const app = new Vue({
  store// 注入仓库
})
app.$mount()

index.vue

<template>
  <view>
    <button class="primary" @click="setUserName('big_cat')">setUserName</button>
    <button class="primary" @click="setUserAge(27)">setUserAge</button>
    <button class="primary" @click="setOrderName('yes')">setOrderName</button>
    <button class="primary" @click="setHasLogin(true)">setHasLogin</button>
    <button class="primary" @click="setToken('tokentokentokentoken')">setToken</button>
    <view class="">
      {{userName}}
    </view>								 
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