详解mpvue开发小程序小总结

最近用mpvue开发了一个小程序，现总结一下碰见的问题及解决方案

1.项目中数据请求用到了fly.io，封装成request.js如下：

import wx from 'wx'
import Fly from 'flyio'
import store from '../store/index'

const fly = new Fly()

fly.config.baseURL = process.env.BASE_URL
fly.config.timeout = 5000

//http 请求拦截器
fly.interceptors.request.use((config) => {
 wx.showNavigationBarLoading()//导航条加载动画
 //给所有请求添加自定义header
 if (store.getters.accessToken) {
 config.headers['Authorization'] = `JWT ${store.getters.accessToken}`
 }
 config.headers['X-Tag'] = 'flyio'
 return config
})

//http 响应拦截器
fly.interceptors.response.use((response) => {
 wx.hideNavigationBarLoading()//导航条加载动画
 const res = response.data
 if (res.status === 0 && (res.errCode === 401 || res.errCode === 403)) {
 //跳转到登录页面
 wx.redirectTo({
 url: '/pages/welcome/main',
 })
 }
 return res
 },
 (err) => {
 wx.hideNavigationBarLoading()//导航条加载动画
 //发生网络错误后会走到这里
 return Promise.reject(err.response)
 },
)

export default fly

2.有关登录的处理：

这个项目中用到了一个登录页，用户登录态失效也会跳转到登录页login.js

import wx from 'wx'
import { loginByCode } from '../api/weAppAuth' //登录接口
import store from '../store'

/**
 * 登录
 * @returns {Promise<any>}
 */
export function weAppLogin () {
 return new Promise((resolve, reject) => {
 // 先调用 wx.login 获取到 code
 wx.login({
 success: (res) => {
 wx.getUserInfo({
 lang: 'zh_CN',
 success: ({rawData, signature, encryptedData, iv, userInfo}) => {
 let data = {
 code: res.code,
 rawData,
 signature,
 encryptedData,
 iv,
 userInfo,
 }
 // console.log(JSON.stringify(data))
 loginByCode(data).then(res => {
 // 该为我们后端的逻辑 若code > 0为登录成功，其他情况皆为异常 （视自身情况而定）
 if (res.status === 1) {
 // 保存用户信息相关操作
 ...
 resolve(res)
 } else {
 reject(res)
 }
 }).catch(err => {
 reject(err)
 })
 },
 // 若获取不到用户信息 （最大可能是用户授权不允许，也有可能是网络请求失败，但该情况很少）
 fail: (err) => {
 reject(err)
 },
 })
 },
 })
 })
}

welcome.vue

 <button
 class="default-btn "
 open-type="getUserInfo"
 @getuserinfo="onGotUserInfo"
 type="primary"
 >
 微信登录
</button>

 methods: {
 //登录
 onGotUserInfo ({mp}) {
 const {detail} = mp
 if (!detail.rawData) {
 Dialog({
 title: '重新授权',
 message: '需要获取您的公开信息（昵称、头像等），请点击"微信登录"进行授权',
 confirmButtonText: '确定',
 confirmButtonColor: '#373737',
 })
 } else {
 weAppLogin().then(res => {
 console.log(res)
 Toast({
 type: 'success',
 message: '登录成功',
 selector: '#zan-toast-test',
 timeout:1000
 })
 setTimeout(() => {
 wx.switchTab({
 url: '/pages/index/main',
 })
 }, 1000)
 }).catch(err => {
 console.log(err)
 })
 }
 },
 },

3.支付方法封装成promise

import wx from 'wx'

/**
 * 支付
 * @param data
 * @returns {Promise<any>}
 */
export function wechatPay (data) {
 const {timeStamp, nonceStr, signType, paySign} = data
 return new Promise((resolve, reject) => {
 wx.requestPayment({
 timeStamp: timeStamp,
 nonceStr: nonceStr,
 package: data.package,
 signType: signType,
 paySign: paySign,
 success: (res) => {
 resolve(res)
 },
 fail: (err) => {
 reject(err)
 },
 })
 })
}

4.使用腾讯云存储上传图片

项目中使用了cos-wx-sdk-v5

封装upload.js方法:

const COS = require('../../static/js/cos-wx-sdk-v5')
import fly from './request'

export const Bucket = process.env.Bucket
export const Region = process.env.Region

// 文件扩展名提取
export function fileType (fileName) {
 return fileName.substring(fileName.lastIndexOf('.') + 1)
}

// 名称定义
export function path(id, type, fileType) {
 const date = new Date()
 const year = date.getFullYear()
 const month = date.getMonth() + 1
 const day = date.getDate()
 var time = date.toTimeString()
 time = time.substr(0, 8)
 time = time.replace(/:/g, '-')
 return `/mobile/groups/${id}/${type}/` +
 (year + '-' + (month < 10 ? '0' + month : String(month)) + '-' +
 (day < 10 ? '0' + day : String(day)) + '-' + time) + '.' + fileType
}

// base64转换成file文件
export function Base64ToBlob (urlData) {
 // 去掉url的头，并转换为byte
 let bytes = window.atob(urlData.split(',')[1])

 // 处理异常,将ascii码小于0的转换为大于0
 let ab = new ArrayBuffer(bytes.length)
 let ia = new Uint8Array(ab)
 for (let i = 0; i < bytes.length; i++) {
 ia[i] = bytes.charCodeAt(i)
 }
 return new Blob([ab], {
 type: 'image/png',
 })
}

export const cos = new COS({
 getAuthorization: (options, callback) => {
 let url = '/qcloud/cos_sign'
 fly.request({
 url: url,
 method: 'post',
 body: {
 method: (options.Method || 'get').toLowerCase(),
 pathname: '/' + (options.Key || ''),
 },
 }).then(res => {
 callback(res.data.authorization)
 }).catch(err => {
 console.log(err)
 })

 //本地测试
 /*let authorization = COS.getAuthorization({
 SecretId: '你的id',
 SecretKey: '你的key',
 Method: options.Method,
 Key: options.Key,
 })
 callback(authorization)*/
 },
})

小程序上传多图时保证图片均上传到cos服务器再执行其余操作：

//选择图片
chooseImage () {
 wx.chooseImage({
 count: this.chooseImageNum,
 sizeType: ['original'],
 sourceType: ['album', 'camera'],
 success: (res) => {
 this.imageList = [...this.imageList, ...res.tempFilePaths]
 },
 })

},

uploadImg (data, index) {
 return new Promise((resolve, reject) => {
 let filePath = data
 let fileName = path(this.id, 'test',
 fileType(filePath.substr(filePath.lastIndexOf('/') + 1))) + index
 cos.postObject({
 Bucket: Bucket,
 Region: Region,
 Key: fileName,
 FilePath: filePath,
 }, (err, res) => {
 if (res.statusCode === 200) {
 let item = {
 imageUrl: res.Location,
 }
 this.data.imageList.push(item)
 resolve(res)
 } else {
 reject(err)
 }
 })

 })
},
//上传图片
 upload () {
 return new Promise((resolve, reject) => {
 //没有图片
 if (this.imageList.length === 0) {
 let data = {
 statusCode: 200,
 }
 resolve(data)
 return
 }
 //有图片
 let all = []
 for (let i = 0; i < this.imageList.length; i++) {
 all.push(this.uploadImg(this.imageList[i], i))
 }
 Promise.all(all).then(res => {
 resolve(res)
 }).catch(err => {
 reject(err)
 })
 })
},

handleSubmit(){
 this.upload().then(res=>{
 //执行剩余步骤
 }).catch(err=>{
 console.log(err)
 })
}