小程序生成二维码并保存到系统相册

使用weapp-qrcode插件生成二维码

wxml：

保存二维码

// pages/QRcode/QRcode.js
let QRCode = require("../../utils/weapp-qrcode") //引入生成二维码的插件
Page({

  /**
   * 页面的初始数据
   */
  data: {
    myQrcode: 1, //canvas的id
  },

  /**
   * 生命周期函数--监听页面加载
   */
  onLoad: function (options) {
    this.getQrcode(this.data.myQrcode)
  },
  getQrcode(canvas) {
  //canvas是canvas-id
    console.log(canvas)
    let qrcode = new QRCode(canvas, {
      // text: 'https://www.baidu.com/img/pc_cc75653cd975aea6d4ba1f59b3697455.png',
      text: '畅游甘孜',
      width: 200,
      height: 200,
      colorDark: "#000000",
      colorLight: "#ffffff",
      correctLevel: QRCode.CorrectLevel.L //二维码辨识度
    });
  },
  save() {
    let that = this
    console.log(11)
    //将画布中的二维码导出来
    wx.canvasToTempFilePath({
      canvasId: this.data.myQrcode, //传入canvas的id
      success: function (res) {
        console.log(res)
        var tempFilePath = res.tempFilePath;
        console.log(tempFilePath);
        //保存二维码
   		  wx.getSetting({
          success(res) {
            if (!res.authSetting['scope.writePhotosAlbum']) {
              wx.authorize({
                scope: 'scope.writePhotosAlbum',
                success(){
                  wx.saveImageToPhotosAlbum({
                      filePath: tempFilePath,
                      success: function(res) {
                        wx.showToast({
                          title: '图片保存成功',
                          icon: 'success',
                          duration: 2000 //持续的时间
                        })
                      },
                      fail: function (err) {
                        console.log(err)
                        wx.showToast({
                        title: '图片保存失败',
                        icon: 'none',
                        duration: 2000//持续的时间
                      })
                    }
                  })
                },
                fail: function (err){
                  console.log('点击了拒绝')
                  console.log(err)
                }
              })
            }else{
              wx.saveImageToPhotosAlbum({
                filePath: tempFilePath,
                success: function(res) {
                  wx.showToast({
                    title: '图片保存成功',
                    icon: 'success',
                    duration: 2000 //持续的时间
                  })
                },
                fail: function (err) {
                  console.log(err)
                  wx.showToast({
                  title: '图片保存失败',
                  icon: 'none',
                  duration: 2000//持续的时间
                })
              }
            })
            }
          }
        })
      },
      fail: function (res) {
        console.log(res);
      }
    },this);
  },

})