Vue学习有一段时间了，就想着用Vue来写个项目练练手，弄了半个月，到今天为止也算勉强能看了。
由于不知道怎么拿手机App的接口，并且KFC电脑端官网真的...一言难尽，所以项目所有数据都是我截图然后写在EasyMock里的，有需要的同学可以自取
技术栈
vue + webpack + vuex + axios
文件目录
│ App.vue│ main.js│├─assets│ logo.png│├─components│ │ cartcontrol.vue│ │ code.vue│ │ coupon.vue│ │ mineHeader.vue│ │ scroll.vue│ │ shopHeader.vue│ │ sidebar.vue│ │ submitBar.vue│ │ takeout.vue│ │ wallet.vue│ ││ └─tabs│ Other.vue│ Outward.vue│ Selfhelp.vue│ Vgold.vue│├─pages│ ├─home│ │ home.vue│ ││ ├─mine│ │ mine.vue│ ││ ├─order│ │ order.vue│ ││ └─shop│ shop.vue│├─router│ index.js│└─vuex │ store.js │ types.js │ └─modules com.js cou.js take.js
效果展示
定义的组件
better-scroll
因为每个页面都需要滑动，所以一开始就把scroll组件封装好，之后使用的话引入一下就行了
<template> <div ref="wrapper"> <slot></slot> </div></template><script>import BScroll from 'better-scroll';const DIRECTION_H = 'horizontal';const DIRECTION_V = 'vertical';export default { name: 'scroll', props: { /** * 1 滚动的时候会派发scroll事件，会节流。 * 2 滚动的时候实时派发scroll事件，不会节流。 * 3 除了实时派发scroll事件，在swipe的情况下仍然能实时派发scroll事件 */ probeType: { type: Number, default: 1 }, /** * 点击列表是否派发click事件 */ click: { type: Boolean, default: true }, /** * 是否开启横向滚动 */ scrollX: { type: Boolean, default: false }, /** * 是否派发滚动事件 */ listenScroll: { type: Boolean, default: false }, /** * 列表的数据 */ data: { type: Array, default: null }, pullup: { type: Boolean, default: false }, pulldown: { type: Boolean, default: false }, beforeScroll: { type: Boolean, default: false }, /** * 当数据更新后，刷新scroll的延时。 */ refreshDelay: { type: Number, default: 20 }, direction: { type: String, default: DIRECTION_V } }, methods: { _initScroll() { if(!this.$refs.wrapper) { return } this.scroll = new BScroll(this.$refs.wrapper, { probeType: this.probeType, click: this.click, eventPassthrough: this.direction === DIRECTION_V ? DIRECTION_H : DIRECTION_V }) // 是否派发滚动事件 if (this.listenScroll) { this.scroll.on('scroll', (pos) => { this.$emit('scroll', pos) }) } // 是否派发滚动到底部事件，用于上拉加载 if (this.pullup) { this.scroll.on('scrollEnd', () => { if (this.scroll.y <= (this.scroll.maxScrollY + 50)) { this.$emit('scrollToEnd') } }) } // 是否派发顶部下拉事件，用于下拉刷新 if (this.pulldown) { this.scroll.on('touchend', (pos) => { // 下拉动作 if (pos.y > 50) { this.$emit('pulldown') } }) } // 是否派发列表滚动开始的事件 if (this.beforeScroll) { this.scroll.on('beforeScrollStart', () => { this.$emit('beforeScroll') }) } }, disable() { // 代理better-scroll的disable方法 this.scroll && this.scroll.disable() }, enable() { // 代理better-scroll的enable方法 this.scroll && this.scroll.enable() }, refresh() { // 代理better-scroll的refresh方法 this.scroll && this.scroll.refresh() }, scrollTo() { // 代理better-scroll的scrollTo方法 this.scroll && this.scroll.scrollTo.apply(this.scroll, arguments) }, scrollToElement() { // 代理better-scroll的scrollToElement方法 this.scroll && this.scroll.scrollToElement.apply(this.scroll, arguments) }, }, mounted() { setTimeout(() => { this._initScroll() },20) }, watch: { data () { setTimeout(() => { this.refresh() },this.refreshDelay) } },}</script><style></style>slot 插槽是一块模板，显示不显示，以及怎样显示由父组件来决定， 也就是把你想要滑动的区域插进去，剩下的内容都是官方文档定义好的，复制一遍就好了
固定头部
头部相对页面是固定的，这里我把头部都封装成了组件，在主页面引入头部，要滑动的部分放入上面定义好的scroll组件即可
侧边栏以及弹出框
起初我的想法是用router-link直接跳转，然后发现这样做页面会自带导航栏，于是我决定通过CSS动态绑定来实现它
<template> <div class="sidebar"> <div class="sidebar-con" :class="{showbar: showSidebar}"> <div class="navbar_left" @click="backTo"> <img src="../pages/mine/zuo.png" alt=""> </div> <van-tree-select :height="850" :items="items" :main-active-index="mainActiveIndex" :active-id="activeId" @navclick="onNavClick" @itemclick="onItemClick"/> </div> </div></template>样式用的是Vant UI组件，最外面绑定了一个动态样式showbar，然后把整体的初始位置设在屏幕之外，当传入参数为true时再回来，用Vuex管理它的状态
.sidebar-con { position: absolute; top: 0; left: -400px; transform: translateZ(0); opacity: 0; width: 100%; z-index: 1002; height: 100%; overflow: auto; transition: all 0.3s ease;}.showbar { transform: translateX(400px); opacity: 1;}Vuex状态管理
const state = { showSidebar: false}const mutations = { [types.COM_SHOW_SIDE_BAR] (state, status) { state.showSidebar = status }}const actions = { setShowSidebar ({commit}, status) { commit(types.COM_SHOW_SIDE_BAR, status) }}const getters = { showSidebar: state => state.showSidebar}用mapGetter拿到对象，然后传给computed属性，对象可以直接使用
computed: { ...mapGetters([ 'showSidebar' ]) },当需要显示的时候使用dispatch将参数传入 this.$store.dispatch('setShowSidebar', true)
整体代码
<template> <div class="sidebar"> <div class="sidebar-con" :class="{showbar: showSidebar}"> <div class="navbar_left" @click="backTo"> <img src="../pages/mine/zuo.png" alt=""> </div> <van-tree-select :height="850" :items="items" :main-active-index="mainActiveIndex" :active-id="activeId" @navclick="onNavClick" @itemclick="onItemClick"/> </div> </div></template><script>import { TreeSelect } from 'vant';import { mapGetters } from 'vuex';export default {data() { return { }, ], // 左侧高亮元素的index mainActiveIndex: 0, // 被选中元素的id activeId: 1 }; }, computed: { ...mapGetters([ 'showSidebar' ]) }, methods: { onNavClick(index) { this.mainActiveIndex = index; }, onItemClick(data) { this.activeId = data.id; this.$emit('active', data.text) this.$store.dispatch('setShowSidebar', false) }, backTo(){ this.$store.dispatch('setShowSidebar', false) }, }}</script><style scoped>.sidebar-con { position: absolute; top: 0; left: -400px; transform: translateZ(0); opacity: 0; width: 100%; z-index: 1002; height: 100%; overflow: auto; transition: all 0.3s ease;}.showbar { transform: translateX(400px); opacity: 1;}.navbar_left { background-color: #da3a35;}.navbar_left img { width: 25px; height: 25px; margin-left: 3vw; margin-top: 5px;}</style>外卖点餐
这里参考的是慕课网黄奕大大的课程，课程地址
商品展示
<template> <div class="takeout" :class="{showtakeout: showTakeout}"> <div class="goods"> <div class="header"> <div class="navbar_left" @click="backTo"> <img src="../pages/shop/zuo.png" alt=""> </div> <div class="appointment"> <div class="btn"> <div class="yy">预约</div> <div class="Kcoffee">K咖啡</div> </div> <div class="bag"> <router-link style="color: #000" to="/coupon"> <div class="bagtext"> 卡包<p>3</p>张 </div> </router-link> </div> </div> </div> <div class="goodList"> <div class="menu-wrapper" ref="menuWrapper"> <ul> <li v-for="(item,index) in goods" :key="index" class="menu-item" :class="{'current':currentIndex===index}" @click="selectMenu(index,$event)" > <span class="text border-1px"> {{item.name}} </span> </li> </ul> </div> <div class="foods-wrapper" ref="foodsWrapper"> <ul> <li v-for="(item,index) in goods" :key="index" class="food-list" ref="foodList"> <h1 class="title">{{item.name}}</h1> <ul> <li v-for="(food,index) in item.foods" :key="index" class="food-item border-1px" @click="selectFood(index, $event)" > <div class="icon"> <img :src="food.image"> </div> <div class="content"> <h2 class="name">{{food.name}}</h2> <div class="price"> <span class="now">￥{{food.price}}</span> </div> <div class="cartcontrol-wrapper"> <cartcontrol @add="addFood" :food="food"></cartcontrol> </div> </div> </li> </ul> </li> </ul> </div> </div> <submit-bar ref="shopcart" :selectFoods="selectFoods"></submit-bar> </div> </div></template>这里通过currentIndex和index做对比，来确认是否添加current类，通过添加current类来实现当前页面的区域的样式变化，他们之间的对比关系也就是menu区域和foods区域的显示区域的对比关系
需要注意的是vue传递原生事件使用$event
<script>import BScroll from 'better-scroll'import cartcontrol from './cartcontrol'import submitBar from './submitBar'import { mapGetters } from 'vuex'export default { name: 'takeout', data() { return { goods: [], listHeight: [], scrollY: 0 } }, components: { cartcontrol, submitBar }, computed: { ...mapGetters([ 'showTakeout' ]), currentIndex () { for(let i = 0; i < this.listHeight.length; i++) { let height1 = this.listHeight[i - 1] let height2 = this.listHeight[i] if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) { return i } } return 0 }, selectFoods () { let foods = [] this.goods.forEach(good => { good.foods.forEach(food => { if (food.count) { foods.push(food) } }) }) return foods } }, methods: { backTo () { this.$store.dispatch('setShowTakeout', false) }, selectMenu(index, event) { if (!event._constructed) { return; } let foodList = this.$refs.foodList; let el = foodList[index]; this.foodsScroll.scrollToElement(el, 300); }, selectFood(food, event) { if (!event._constructed) { return; } this.selectedFood = food; }, _initScroll() { this.meunScroll = new BScroll(this.$refs.menuWrapper, { click: true }) this.foodsScroll = new BScroll(this.$refs.foodsWrapper, { click: true, probeType: 3 }) this.foodsScroll.on('scroll', pos => { this.scrollY = Math.abs(Math.round(pos.y)) }) }, _calculateHeight () { let foodList = this.$refs.foodList let height = 0 for (let i = 0; i < foodList.length; i++) { let item = foodList[i] height += item.clientHeight this.listHeight.push(height) } }, }, created () { this.$http.get('https://www.easy-mock.com/mock/5ca49494ea0dc52bf3b67f4e/example/takeout') .then(res => { if (res.data.errno === 0) { this.goods = res.data.data this.$nextTick(() => { this._initScroll() this._calculateHeight() }) } }) }}</script>购物车
<template><div class="submitBar"> <van-submit-bar :loading="setloading" :price="totalPrice" button-text="提交订单" @submit="onSubmit"> <div class="shoppingCart" @click="toggleList"> <img src="../../images/gwc.png" alt=""> <span v-if="selectFoods.length > 0">{{selectFoods.length}}</span> </div></van-submit-bar> <transition name="fold"> <div class="shopcart-list" v-show="listShow"> <div class="list-header"> <h1 class="title">购物车</h1> <span class="empty" @click="empty">清空</span> </div> <div class="list-content" ref="listContent"> <ul> <li class="food" v-for="(food, index) in selectFoods" :key="index"> <span class="name">{{food.name}}</span> <div class="price"> <span>￥{{food.price*food.count}}</span> </div> <div class="cartcontrol-wrapper"> <cartcontrol @add="addFood" :food="food"></cartcontrol> </div> </li> </ul> </div> </div> </transition> <transition name="fade"> <div class="list-mask" @click="hideList" v-show="listShow"></div> </transition></div></template>购物车列表的显示和隐藏以及清空按钮是通过数据fold来决定的，购物车列表是通过计算属性listshow来实现，清空按钮也是通过设置count属性来实现，这样都达到了不用操作dom就可以改变dom行为的效果。
<script>import { SubmitBar } from 'vant';import BScroll from 'better-scroll';import cartcontrol from './cartcontrol';export default { props: { selectFoods: { type: Array, default() { return [ { price: 10, count: 1 } ] } }, }, data() { return { setloading: false, fold: true } }, computed: { totalCount () { let count = 0 this.selectFoods.forEach((food) => { count += food.count }) return count }, totalPrice () { let total = 0 this.selectFoods.forEach((food) => { total += food.price * food.count * 100 }) return total }, listShow () { if (!this.totalCount) { this.fold = true return false } let show = !this.fold if (show) { this.$nextTick(() => { if (!this.scroll) { this.scroll = new BScroll(this.$refs.listContent, { click: true }) } else { this.scroll.refresh() } }) } return show } }, methods: { toggleList(){ console.log(this.totalCount) if (!this.totalCount) { return; } this.fold = !this.fold; }, onSubmit() { this.setloading = true }, empty() { this.selectFoods.forEach((food) => { food.count = 0; }); }, hideList() { this.fold = true; }, addFood() {} }, components: { cartcontrol }}</script>操作按钮
这个模块主要通过三个小模块实现,删除按钮,显示数量块,增加按钮
<template> <div class="cartcontrol"> <transition name="move"> <div class="cart-decrease" v-show="food.count > 0" @click="decreaseCart"> <div class="inner"> <img width="15px" height="15px" src="../../images/jian.png" alt=""> </div> </div> </transition> <div class="cart-count" v-show="food.count > 0">{{food.count}}</div> <div class="cart-add" @click="addCart"> <img width="15px" height="15px" src="../../images/add.png" alt=""> </div> </div></template>addCart以及decreaseCart方法，默认会传入event原生dom事件，food数据是从父组件传入的，所以对这个数据的修改，也能够反应到父组件，也因为购物车的数据也是从父组件传入的，使用同一个food数据，从而关联到购物车的购买数量统计。
<script>export default { name: "cartcontrol", props: { food: { type: Object } }, data() { return { } }, methods: { addCart (event) { console.log(event) if (!event._constructed) { return } if (!this.food.count) { this.$set(this.food, 'count', 1) } else { this.food.count++ } this.$emit('add', event.target) }, decreaseCart (event) { if (!event._constructed) { return } if (this.food.count) { this.food.count-- } } },}</script>异步问题
<div class="various" v-for="(item,index) in various" :key="index"> <div class="title"> <div class="strip"></div> <p>{{item[0].name}}</p> <div class="strip"></div> </div> <div class="various_img"> <div class="various_title"> <img :src="item[0].urll" alt=""> </div> <div ref="listwrapper" class="index"> <div class="various_list"> <div class="various_box" v-for="(u,i) in item.slice(1)" :key="i"> <img :src="u.url" alt=""> </div> </div> </div> </div> </div>这里循环嵌套，整个DOM结构都是循环出来的，而better-scroll需要操作DOM结构，要实现横向滑动效果，难免会有异步问题。
可是无论我使用.then或者$nextTick都无法挂载better-scroll，查阅了大量文档也无法解决，最后只能使用原生的overflow-X，若是有解决办法，欢迎提出，感激不尽!
结语
总的来说这个项目还有很多不足，实现的功能也很少，后续我会继续改进。
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总结
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