原文：https://blog.csdn.net/xbw12138/article/details/75213274

前端?
二維碼生成?
二維碼要求：每分鐘刷新一次，模擬了個(gè)雞肋，添加了個(gè)按分鐘顯示的時(shí)間加在二維碼中，起到刷新的作用，在onshow中每次打開界面就會(huì)刷新顯示

var QR = require("../../utils/qrcode.js"); var util = require("../../utils/util.js"); data: { qrMsg: '', recognizeMsg: '', isShowMsg: false, isShowResult: false, showClear: true, qrlogin :false, }, onShow: function () { var that=this; this.setData({ isShowMsg: false, isShowResult: true, }) // 頁(yè)面顯示，用戶已注冊(cè) if (getApp().globalData.userSign == 1) { that.setData({ qrlogin: true, }) //存儲(chǔ)openid wx.getStorage({ key: 'openid', success: function (res) { var openid = res.data; //加入分鐘，每分鐘刷新一次二維碼 QR.qrApi.draw('wechat@'+openid + '@' + util.formatTimeQrcodeChange(new Date), 'mycanvas', 300, 300) } }) } else if (getApp().globalData.userSign == 2){ that.setData({ qrlogin:false, }) } },

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掃描二維碼

recognizeCode: function () {this.setData({isShowMsg: true, isShowResult: false, recognizeMsg: "", }) var that = this //小程序API wx.scanCode({ //掃描條形碼ISBN success: function (res) { // success console.log('https://book.douban.com/subject/' + res.result+'/'); var url = 'https://book.douban.com/subject/' + res.result + '/'; wx.navigateTo({ url: '../desc/desc?url=' + url }) }, fail: function () { // fail }, complete: function () { // complete } }) },

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utils.js中添加以下代碼

function formatTimeQrcodeChange(date) {var year = date.getFullYear() var month = date.getMonth() + 1 var day = date.getDate() var hour = date.getHours() var minute = date.getMinutes() //按分鐘顯示，去掉秒 //var second = date.getSeconds() return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute].map(formatNumber).join(':') }

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qrcode.js

var QR = (function () {// alignment pattern var adelta = [ 0, 11, 15, 19, 23, 27, 31, 16, 18, 20, 22, 24, 26, 28, 20, 22, 24, 24, 26, 28, 28, 22, 24, 24, 26, 26, 28, 28, 24, 24, 26, 26, 26, 28, 28, 24, 26, 26, 26, 28, 28 ]; // version block var vpat = [ 0xc94, 0x5bc, 0xa99, 0x4d3, 0xbf6, 0x762, 0x847, 0x60d, 0x928, 0xb78, 0x45d, 0xa17, 0x532, 0x9a6, 0x683, 0x8c9, 0x7ec, 0xec4, 0x1e1, 0xfab, 0x08e, 0xc1a, 0x33f, 0xd75, 0x250, 0x9d5, 0x6f0, 0x8ba, 0x79f, 0xb0b, 0x42e, 0xa64, 0x541, 0xc69 ]; // final format bits with mask: level << 3 | mask var fmtword = [ 0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976, //L 0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0, //M 0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed, //Q 0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b //H ]; // 4 per version: number of blocks 1,2; data width; ecc width var eccblocks = [ 1, 0, 19, 7, 1, 0, 16, 10, 1, 0, 13, 13, 1, 0, 9, 17, 1, 0, 34, 10, 1, 0, 28, 16, 1, 0, 22, 22, 1, 0, 16, 28, 1, 0, 55, 15, 1, 0, 44, 26, 2, 0, 17, 18, 2, 0, 13, 22, 1, 0, 80, 20, 2, 0, 32, 18, 2, 0, 24, 26, 4, 0, 9, 16, 1, 0, 108, 26, 2, 0, 43, 24, 2, 2, 15, 18, 2, 2, 11, 22, 2, 0, 68, 18, 4, 0, 27, 16, 4, 0, 19, 24, 4, 0, 15, 28, 2, 0, 78, 20, 4, 0, 31, 18, 2, 4, 14, 18, 4, 1, 13, 26, 2, 0, 97, 24, 2, 2, 38, 22, 4,

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