Recently I am learning WeChat applet development, and I am also working with two classmates to imitate the WeChat applet of Wu APP. Here I will mainly share my learning process and some pitfalls I have encountered. I hope it will be helpful to you.
The parts I am responsible for in the project are mainly as follows (some data are fixed data written inconfig, The js file is exposed throughmodule.exports. When it needs to be referenced, it should be introduced in the corresponding js header of the page, for exampleconst {} = require('../../../../config/ buys')). I use manyvantcomponents in the project, and I need to introducevantwhen building thenpmpackage. For details, please seeNPM Installation with Like Vant. When a page uses third-party components, it must be declared in the corresponding json file. In order to avoid duplication of work, it can be declared directly inapp.json. Example: ("usingComponents": "van-search": "@vant/weapp/search/index"})
|-config 对应数据 |-assem.js |-buys.js |-detail.js |-kind.js |-search.js |-pages |-buy_page |-page |-assem 筛选排序页 |-buy 购买首页 |-detail 商品详情页 |-kinds 品牌分类页 |-produce 鉴别简介页 |-search 搜索页
Refer to the Dewu APP WeChat applet. The following is the tabBar of my applet. (A bit rough, but still watchable)
"tabBar": { "selectedColor": "#000000", "borderStyle": "white", "backgroundColor": "#fff", "list": [ { "text": "购买", "pagePath": "pages/buy_page/page/buy/buy", "iconPath": "images/buy.png", "selectedIconPath": "images/buy_active.png" }, { "text": "鉴别查询", "pagePath": "pages/disting/disting", "iconPath": "images/disting.png", "selectedIconPath": "images/disting_active.png" }, { "text": "洗护", "pagePath": "pages/wash/wash", "iconPath": "images/wash.png", "selectedIconPath": "images/wash_active.png" }, { "text": "我", "pagePath": "pages/my_page/my/my", "iconPath": "images/my.png", "selectedIconPath": "images/my_active.png" } ] },
Cloud database is a NoSQL database. Each table is a collection. For the part of my project, I basically built a collection of items.
dewu_goods 商品表 用于存储创商品的信息 - _id - amway 是否为推荐 - brand 品牌 - buyer 已购买人数 - ctime 数据创建时间 - digest 详情介绍 - img 详情图 - pic 商品展示图 - kind 种类 - price 价格 - sex 适应人群 - title 简介 - type 首页索引
After creating the data collection, you need to modify the data permissions before you can access it normally.
These operations can be performed in the database. Note that the imported data format needs to be a.csvor.jsonfile. You can First use an excel table to create a data set and how to convert it into a corresponding format file and directly import it into the database.
const db = wx.cloud.database() //云数据库 const dewuCollection = db.collection('dewu') //在js文件中导入数据集合
The following is the Dewu APP applet interface I mainly implemented
Next, we will deconstruct the details of each page.
正品保障 {{}}
商品项van-grid-item中采用绝对定位。tips中将direction属性设置为horizontal，可以让宫格的内容呈横向排列。搜索框设置disabled属性为禁用状态解决单击自动聚焦的问题。在使用van-grid布局时自定义每一项的属性需设置use-slot属性，否则不生效。
这个页面布局并不复杂，不过我在写这个布局时还是遇到了坑（感觉是自己跳进去的 我太了）。在做dewu-hd吸顶时我是直接用van-sticky包起来实现，但是实际效果是tabs也需要固定在dewu-hd下面。这里不可以使用同上的方法，实际效果会使得整个van-tabs吸顶导致页面无法滑动。其实在这里只需要给van-tabs添加一个sticky属性并且设置offset-top，注意这两个属性需一起使用才能生效。
async onLoad() { this.proData() //获取推荐数据项 this.shoeData() //获取鞋类数据项 }, proData() { const {data} = await dewuCollection .where({ amway: db.command.eq('TRUE') }) .field({ //获取指定数据项，提升性能 _id:true, pic:true, title:true, buyer:true, price:true }) .get() // console.log(data); this.setData({ produces: data, }) } shoeData() { let data1 = await dewuCollection .where({ type: 1 }) .get() // console.log(data1.data); this.setData({ shoes: data1.data }) }
gotoDetail(e) { // console.log(e); wx.navigateTo({ url: '/pages/buy_page/page/detail/detail?id='+e.currentTarget.dataset.id, }) },
利用商品_id属性唯一，当设定数据项id等于_id时跳转到详情页且展示对应数据。
{{img.digest}} ￥{{img.price}} 选择尺码 请选择尺码
整体分为detail_hd和detail_bd两部分。自定义swiper需设置dot对应展示图片并更改样式，circular属性设置是否启用滑块切换动画，这里使用三目运算符判断是否添加新的样式类名。在定义商品价格的样式的时候可以通过first-letter伪元素来定义￥符号样式。引用组件van-goods-action使得购买按钮吸底。
￥ -- {{item.price}} 请选择商品 已选 {{item.size}} {{item.size}} ￥{{item.price}}
使用van-popup组件，给对应标签设置事件即可绑定弹出。例：closeable属性启用关闭按钮。square设置van-grid-item为方形，gutter设置格子间距。
相关推荐
设置detail_produce-hd吸顶，给右侧关闭icon绑定bind:close="onClose"事件。
async onLoad(options) { //获取对应_id的商品数据 console.log(options); let id = options.id console.log(id); wx.cloud.database().collection('dewu') .doc(id) .get() .then(res => { console.log(res); this.setData({ img :res.data }) }) },
showPopup() { //显示弹出层 this.setData({ show: true, }); }, onClose() { //关闭弹出层 this.setData({ show: false, }); },
pickSize(e) { let flag = e.currentTarget.dataset.flag let index = e.currentTarget.dataset.index if(flag==index) { this.setData({ activeSizeIndex: -1, flag: -1 }) } else { this.setData({ activeSizeIndex: index, flag: index }) } },
点击尺码，flag==index即为选中状态，再次点击时或者点击其他尺码时设置为非选中状态，否则使flag等于index，使其变成选中状态。
历史搜索 {{}}
搜索页面主要分为头部搜索框和内容（搜索推荐，历史记录和搜索到的商品列表）两部分。这里用van-sticky包装搜索框使吸顶，内容部分则用block标签包装，利用wx:if这个控制属性来判断是否显示。
async onSearch(e) { // console.log(e); if (!e.detail.trim()) { wx.showToast({ title: '请输入商品名', }) return } let {value, historyList} = this.data if(historyList.indexOf(value) !== -1) { historyList.splice(historyList.indexOf(value), 1) } historyList.unshift(value) this.setData({ historyList }) wx.setStorageSync('value', historyList) let keyword = e.detail.trim() let results = await dewuCollection .where({ title: db.RegExp({ regexp: keyword, options: 'i' }) }) .get() if (results.data.length == 0 || keyword == '') { wx.showToast({ title: '不存在'+keyword, }) } else { await dewuCollection .where({ title: db.RegExp({ regexp: keyword, options: 'i' }) }) .orderBy('hot', 'desc') .get() .then(res => { console.log(res); this.setData({ results: res.data }) }) } }, onLoad() { this.getSearchHistory() //获取历史搜索 }, getSearchHistory() { let historyList = wx.getStorageSync('value') if(historyList) { this.setData({ historyList }) } },
页面加载时从本地storage中获取历史搜索记录，在确定搜索onSearch时判断value是否为空，将合法value插入historyList中，这里使用的时unshift方法，这样可以保证最近的搜索记录展示在前面，利用正则表达式模糊查询数据库中符合的项存入数组results中，当results.length > 0时显示商品列表。利用wx.setStorageSync将value存入缓存，wx.getStorageSync获取打印出来。通过indexOf方法判断value是否已经存在，是则删除historyList中的该项。
async historySearch(e) { // console.log(e); let historyList = this.data.historyList let value = historyList[e.currentTarget.dataset.index] this.setData({ value, //修改value showHotList: false, //隐藏热门搜索 showHistory: false, //隐藏历史搜索 results: [] //清空商品列表 }) },
点击历史搜索项时setData使对应值改变，再调用onSearch方法。
onClear() { this.setData({ results: [], value: '', showHotList: true, showHistory: true }); }, onChange(e) { //search框输入改变时实时修改数据 // console.log(e.detail); this.setData({ value: e.detail, showHotList: false, showHistory: false, results: [] }) // console.log(this.data.showHotList); if (this.data.value=='') { this.setData({ showHotList: true, showHistory: true }) } },
deleteSearchHistory() { wx.showModal({ content: '确认清空历史记录', success: (res) => { if(res.confirm) { this.setData({ historyList: [] }) } } }) wx.removeStorageSync('value') },
点击删除icon弹出对话框wx.showModal实现交互，用户点击确定则清空historyList并利用wx.removeStorageSync将本地存储的历史记录删除。
{{}} {{}} {{}}
分类页面主要是使用了scroll-view设置竖向滚动，点击左侧scroll-view-left-item时该项变为得物色（#00cbcc）并显示对应的品牌种类项kindsItem。整体采用flex布局，这里的坑是scroll-view-left应该把font-size设为0，在子元素scroll-view-left-item中设置font，避免块元素边距影响布局。
onLoad: function (options) { this.setData({ kindNav: kindNav, kindall: kindItem, // console.log(this.data.kindall); let kinds=[]; // console.log(this.data.kindall) this.data.kindall.forEach(kind => { //循环从所有品类中获取对应kindNav的并存入数组中 if(kind.camptype == 0) { kinds.push(kind) } }) this.setData({ kindItem: kinds, }) }, ) },
changeKinds(e) { console.log(e); let {index, type} = e.currentTarget.dataset; console.log(index, type);//index与推荐品牌的索引有关。type与kind.js的camptype有关 this.setData({ activeNavIndex: index, }) let title=[] this.data.kindTitles.forEach(kindTitle => { if(index == kindTitle.titletype) { title.push(kindTitle) } }) this.setData({ kindItem: kinds, }) },
gotoAssem(e) { // console.log(e); 利用kind属性值唯一（buy页面tabs的title） wx.navigateTo({ url: '/pages/buy_page/page/assem/assem?title='+e.currentTarget.dataset.title, }) },
{{item.title}}
tab使用flex布局。goods部分布局参照buy页面的商品布局。
{{}}
这里使用van-collapse组件做折叠面板时有个坑，不应该将van-grid内容部分放在van-collapse-item中，应与其同级，否则会在该单元格下形成留白且无法正常显示内容，多次尝试后还是放在外面方便实现效果。
async onLoad(options) { // console.log(options); let title = options.title let data1 = await dewuCollection .where({ kind: title //绑定跳转时（kind唯一）获取对应数据 }) .get() // console.log(data1); this.setData({ goods: data1.data, titles: title }) },
async changeItem(e) { // console.log(e); let index = e.currentTarget.dataset.index //index对应排序方式 this.setData({ activeTabIndex: index }) // console.log(index); if(index == 1) { //销量排序 await dewuCollection .where({ kind: this.data.titles }) .orderBy('buyer', 'desc') .get() .then(res => { this.setData({ goods: res.data, index: index }) // console.log(this.data.index); }) } if(index == 0) { //综合排序 await dewuCollection .where({ kind: this.data.titles }) .get() .then(res => { this.setData({ goods: res.data }) }) } if(index == 2 && this.data.flag == -1) { //价格降序排序 await dewuCollection .where({ kind: this.data.titles }) .orderBy('price', 'desc') .get() .then(res => { this.setData({ goods: res.data, flag: 1 }) }) return } if(index == 3) { //创建时间排序 await dewuCollection .where({ kind: this.data.titles }) .orderBy('ctime', 'desc') .get() .then(res => { this.setData({ goods: res.data }) }) } if(index == 4) { //弹出筛选层 this.setData({ show: true, }) } else if(index == 2 && this.data.flag == 1) { //价格升序排序 await dewuCollection .where({ kind: this.data.titles }) .orderBy('price', 'asc') .get() .then(res => { this.setData({ goods: res.data, flag: -1 }) }) } },
设置一个flag属性默认值为-1，flag==-1时点击价格降序排序并设置flag==1，flag==1时点击价格升序排序并设置flag==-1。
pick(e) { let flag = e.currentTarget.dataset.flag let index = e.currentTarget.dataset.index let cd = this.data.human[index].kind if(flag==index) { this.setData({ activeIndex1: -1, flag1: -1, cd1: '' }) } else { this.setData({ activeIndex1: index, flag1: index, cd1: cd }) } },
replace() { // 点击重置按钮将所有筛选条件回复默认 this.setData({ flag1: -1, activeIndex1: -1, flag2: -1, activeIndex2: -1, flag3: -1, activeIndex3: -1, cd1: '', cd2: '', cd3: 0, cd4: 10000000, }) },
这里有一个坑是，不可在data中声明（num：Infinity），这里无穷大并不会生效，目前优化是声明为常量.
async ischeck() { //点击确定按钮进行筛选显示结果 let cd3 = Number(this.data.cd3) let cd4 = Number(this.data.cd4)==0?1000000:Number(this.data.cd4) let index = Number(this.data.index) if(this.data.cd1!='' && this.data.cd2!=''){ await dewuCollection .where({ kind: this.data.titles, sex: this.data.cd1, brand: this.data.cd2, price: _.gt(cd3).and(_.lt(cd4)), }) .get() .then(res => { this.setData({ goods: res.data, show: false, }) }) return } },
跳转到详情页且保留对应数据项。这里利用_id唯一，将每一项的_id赋给data-id,当id相等时才能跳转并接受对应_id的数据。
pickSize(e) { let flag = e.currentTarget.dataset.flag let index = e.currentTarget.dataset.index if(flag==index) { this.setData({ activeSizeIndex: -1, flag: -1 }) } else { this.setData({ activeSizeIndex: index, flag: index }) } }, {{item.size}} ￥{{item.price}}
点击尺码时选中并更改text，再次点击该项则重置样式，若点击其他项则取消选中，选中被点击项。这里通过多设一个flag，结合index双重控制是否选中。
changeKinds(e) { console.log(e); let {index, type} = e.currentTarget.dataset; console.log(index, type);//index与推荐品牌的索引有关。type与kind.js的camptype this.setData({ activeNavIndex: index, }) let kinds = [] this.data.kindall.forEach(kind => { if(kind.camptype == type) { kinds.push(kind) } }) this.setData({ kindItem: kinds, }) } {{item.text}}
绑定type和kind.camptype，当点击项改变时，将当前项index赋给activeNavIndex，用kindall存储所有数据项，使用foreach循环遍历kindall，将满足条件kind.camptype==type的数据存入一个数组中kinds，再将setData即可。
deleteSearchHistory() { wx.showModal({ content: '确认清空历史记录', success: (res) => { if(res.confirm) { this.setData({ historyList: [] }) } } }) wx.removeStorageSync('value') },
清空历史记录时不仅将historyList设为空，且利用wx.removeStorageSync将本地存储的缓存清除。
在自己写项目时，多使用console.log()打印，跟进数据变化；多查看文档w3cschool，微信开发文档，Vant-Weapp。
Source code of this project: https://gitee.com/onepiece1205/dewu_weapp
The process of writing a project is a challenge for me. After all, it is my first time to focus on working together on a project. The bugs encountered in the project will be annoying, but after persisting in writing functions, it is very fulfilling. Thank you very much. Teachers and classmates who helped me during the project writing process. If you like this article of mine or if it is helpful to you, please give it a like! At the same time, I very much hope that you can give me some suggestions after reading the article, and I look forward to discussing and learning WeChat mini programs with you!
For more programming-related knowledge, please visit:Introduction to Programming! !
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