（十五）硅谷外卖-使用 vuex 管理状态

一、下载vuex

npm install --save vuex

二、定义state

store/state.js

export default {
    latitude: 40.10038, // 纬度
    longitude: 116.36867, // 经度
    address: {}, // 地址信息对象
    categorys: [], // 分类数组
    shops: [],
}

三、定义mutation-types

store/mutation-types.js

export const RECEIVE_ADDRESS = 'receive_address' // 接收地址信息
export const RECEIVE_CATEGORYS = 'receive_categorys' // 接收分类数组
export const RECEIVE_SHOPS = 'receive_shops' // 接收商家数组

四、定义mutations

store/mutations.js

import {RECEIVE_ADDRESS, RECEIVE_SHOPS, RECEIVE_CATEGORYS} from "./mutation-types"

export default {
    [RECEIVE_ADDRESS](state, {address}) {
        state.address = address
    },
    [RECEIVE_SHOPS](state, {categorys}) {
        state.categorys = categorys
    },
    [RECEIVE_CATEGORYS](state, {shops}) {
        state.shops = shops
    }
}

五、定义actions

store/actions.js

import {reqAddress, reqCategorys, reqShops} from "../api"
import {RECEIVE_ADDRESS, RECEIVE_CATEGORYS, RECEIVE_SHOPS} from "./mutation-types"

export default {
    // 异步获取地址
    async getAddress({commit, state}) {
        const geohash = state.latitude + ',' + state.longitude
        const result = await reqAddress(geohash)
        commit(RECEIVE_ADDRESS, {address: result.data})
    },

    // 异步获取分类列表
    async getCategorys({commit}) {
        const result = await reqCategorys()
        commit(RECEIVE_CATEGORYS, {category: result.data})
    },

    // 异步获取商家列表
    async getShops({commit, state}) {
        const {latitude, longitude} = state
        const result = await reqShops({latitude, longitude})
        commit(RECEIVE_SHOPS, {shops: result.data})
    }
}

六、定义getters

store/getters.js

export default {

}

七、定义store对象

store/index.js

import Vue from 'vue'
import Vuex from 'vuex'
import state from './state'
import mutations from './mutations'
import actions from './actions'
import getters from './getters'

Vue.use(Vuex)

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

八、注册store

main.js

import store from './store'

new Vue({
  store
})