从零开始，搭建一个简单的购物平台（十三）前端商城部分

从零开始，搭建一个简单的购物平台（十二）前端商城部分：
https://blog.csdn.net/time_____/article/details/108471436
项目源码（持续更新）：https://gitee.com/DieHunter/myCode/tree/master/shopping

这篇文章我们来实现一下前端商城的工具类，其他配置和全局状态

工具类：

• 工具类我们统一放在utils文件夹下，并部署在Vue原型上（与Axios的一样）
• 首先我们要实现两个对象深复制的方法，之前博客也有介绍到，后续对全局静态变量做操作时，只能将其定义为只读，也就是不能改变他的值，所以深复制是很有必要的，对于简单的数据用json方式即可，遇上含有function，set，get等属性时需要用到递归版。
  JSON：

  export default class Clone {
    static shallowClone(org) {
      return JSON.parse(JSON.stringify(org));
    }
  }
  

  递归：

  export default class Clone {
    static deepClone(org, tag) {
      var tag = tag || {};
      var name = Object.getOwnPropertyNames(org);
      for (var i = 0; i < name.length; i++) {
        var desc = Object.getOwnPropertyDescriptor(org, name[i]);
        if (typeof desc.value === "object" && desc.value !== null) {
          var obj = desc.value.toString() === "[object Object]" ? {} : [];
          Object.defineProperty(tag, name[i], {
            configurable: desc.configurable,
            enumerable: desc.enumerable,
            writable: desc.writable,
            value: obj
          });
          Clone.deepClone(desc.value, obj);
        } else {
          Object.defineProperty(tag, name[i], desc);
        }
      }
      return tag;
    }
  }
  

• 本地缓存的封装

  import Vue from "vue";
  class Storage {
    static saveStorage(key, val) {
      localStorage.setItem(key, JSON.stringify(val));
    }
    static getStorage(key) {
      try {
        return JSON.parse(localStorage.getItem(key)) || [];
      } catch (error) {}
    }
    static clearStorage(key) {
      try {
        localStorage.removeItem(key);
      } catch (error) {}
    }
  }
  Vue.prototype.$storage = Storage;

其他配置：

• Events：对全局事件做一个封装，这里针对每一个组件和每一个自定义事件用了一个简单的工厂模式，降低代码的耦合性，解决事件封闭，但是缺点是在每一个组件销毁时需要作事件取消监听（销毁），否则会导致之前的监听事件执行两次，虽然每个子工厂生产出来的都是独特的产品，但是会导致性能降低，所以要做事件销毁处理

  import Vue from "vue";
  class Events extends Vue {//继承Vue的自定义事件，使其直接调用
    constructor() {
      super();
    }
    static getInstance() {//返回当前实例的单例
      if (!Events._instance) {
        Object.defineProperty(Events, "_instance", {
          value: new Events()
        });
      }
      return Events._instance;
    }
    onEvent(_event, _fn) {
      this.$on(_event, _fn);
    }
    onceEvent(_event, _fn) {
      this.$once(_event, _fn);
    }
    emitEvent(_event, _data) {
      this.$emit(_event, _data);
    }
    offEvent(_event, _fn) {
      this.$off(_event, _fn)
    }
  }
  Vue.prototype.$events = Events.getInstance()
  

• 全国省市县的JSON文件
  https://gitee.com/DieHunter/myCode/blob/master/shopping/client/shopclient/src/config/city.js 

• 静态Config文件

  export default class Config {
    static Agreement = "http://"; //协议
    static BaseUrl = "127.0.0.1"; //请求ip或域名
    static ServerUrl = ""; //多级路径名
    static ServerPort = ":1024"; //端口
    static Path = "/"; //静态文件目录
    static CryptoKey = "tokenkey"; //加密信息关键字
    static RequestPath =
      Config.Agreement + Config.BaseUrl + Config.ServerPort + Config.Path; //服务端静态目录
    static RequestTimeOut = 10 * 1000; //请求超时时间
    static GetCodeTime = 60 * 1000; //邮箱验证码重发时间
    static ShopMaxCount = [1, 2, 3, 4, 5, 6, 7, 8, 9]; //每件商品可购买数量（选择器配置）
    static ServerApi = {
      //接口名
      token: "user/checkToken", //验证token
      user: {
        userLogin: "user/userLogin", //用户登录
        getMailCode: "user/getMailCode", //获取验证码
        updateUser: "user/updateUser", //更新用户
        userReg: "user/userReg" //注册（移动端）
      },
      shop: {
        shopList: "shop/shopList" //获取商品列表
      },
      order: {
        orderList: "order/orderList", //获取订单列表
        addOrder: "order/addOrder", //新增订单
        delOrder: "order/delOrder", //删除订单
        updateOrder: "order/updateOrder" //更新订单状态
      }
    };
    static UploadName = {
      headPic: "upload/headPic" //图片路径
    };
    static UploadKey = {
      headKey: "headPic" //头像上传关键字
    };
    static StorageName = {
      //本地缓存
      Token: "token",
      ShopCar: "shopCar", //购物车列表
      UserInfo: "userInfo" //用户信息
    };
    static EventName = {
      //自定义事件
      SelectKind: "selectKind", //分类选择
      ChangeCount: "changeCount", //修改商品数量
      ShowPicker: "showPicker", //显示，隐藏Picker
      CountShop: "countShop", //购物车商品总价
      SelectAllChild: "selectAllChild", //全选子选项
      SelectParent: "selectParent", //全选父选项
      IsLogin: "isLogin", //登录成功
      UploadPic: "uploadPic" //上传图片
    };
    static DefaultPageConfig = {
      //默认分页配置
      shopType: "",
      picType: "",
      keyWord: "",
      page: 1,
      isactive: true,
      pageSize: "",
      totalPage: 1,
      orderId: "",
      sort: "1",
      orderState: ""
    };
  }
  

• 邮箱类型选择配置 

  export default class Mail {
    static address = [
      "@qq.com",
      "@gmail.com",
      "@yahoo.com",
      "@msn.com",
      "@hotmail.com",
      "@aol.com",
      "@ask.com",
      "@live.com",
      "@0355.net",
      "@163.com",
      "@163.net",
      "@263.net",
      "@3721.net",
      "@yeah.net",
      "@googlemail.com",
      "@mail.com"
    ];
  }
  

• 商品类型

  export default class ShopType {
    //商品类型，图片类型，订单状态
    static shopType = [
      { name: "炒货", val: "0" },
      { name: "果味", val: "1" },
      { name: "蔬菜", val: "2" },
      { name: "点心", val: "3" },
      { name: "粗茶", val: "4" },
      { name: "淡饭", val: "5" }
      // { name: "其他", val: "6" },
    ];
    static picType = [
      { name: "单个商品", val: "0" },
      { name: "轮播图", val: "1" },
      { name: "分类", val: "2" },
      { name: "主题", val: "3" },
      { name: "其他", val: "4" }
    ];
    static orderState = [
      { name: "未付款", val: "0" },
      { name: "已付款", val: "1" },
      { name: "未发货", val: "2" },
      { name: "已发货", val: "3" },
      { name: "已完成", val: "4" },
      { name: "已退款", val: "5" }
    ];
  }
  

全局Store

• 全局store没有用Vuex,而是用本地缓存做了一个数据存储，在src下新建store文件夹，并新建store.js文件将所有的状态值汇总并暴露，这里我们简单搭建一下购物车，在shopCar中新建数据model层state和命令控制controller层action
  
• store.js

  import Vue from 'vue'
  import ShopCar from "./shopCar/action"
  Vue.prototype.$store = {
    ShopCar
  }
  

   
• state.js

  import Vue from "vue"
  import Config from "../../config/config"
  export default class State extends Vue {
    constructor() {
      super()
    }
    set shopCar(val) {//写数据
      this.$storage.saveStorage(Config.StorageName.ShopCar, val)
    }
    get shopCar() {//读数据
      return this.$storage.getStorage(Config.StorageName.ShopCar) || []
    }
  }
  

•  action.js

  import State from "./state"
  import Vue from "vue"
  import Config from "../../config/config"
  const {
    EventName
  } = Config;
  export default class Action extends Vue {
    constructor() {
      super()
      this._state = new State()
    }
    set state(val) {
      this._state.shopCar = val
    }
    get state() {
      return this._state.shopCar
    }
    countShopItem() {//修改商品数量
      
    }
    delShopItem() {//删除商品
      
    }
    selAllChild() {//全选
      
    }
    filterSelect() {//刷新商品列表
      
    }
    delSelShop() {//删除选择商品
      
    }
  }
  

引入所有包

import Vue from 'vue'
import App from './App'
import router from './router'
import "./style/main.less"
import 'mint-ui/lib/style.css'
import MintUI from 'mint-ui'
import './utils/axios'
import './utils/cryptoTool'
import './utils/storage'
import "./event/event"
import "./store/store"
Vue.use(MintUI);
Vue.config.productionTip = false

/* eslint-disable no-new */
new Vue({
  el: '#app',
  router,
  components: {
    App
  },
  template: '<App/>'
})

到此为止，前端商城准备工作全部完成，下一篇文章正式开始进入开发