<view bindtap='save'>保存圖片到相冊</view>

//點擊保存圖片 save () {  let that = this  //若二維碼未加載完畢，加個動畫提高用戶體驗  wx.showToast({   icon: 'loading',   title: '正在保存圖片',   duration: 1000  })  //判斷用戶是否授權"保存到相冊"  wx.getSetting({   success (res) {    //沒有權限，發起授權    if (!res.authSetting['scope.writePhotosAlbum']) {     wx.authorize({      scope: 'scope.writePhotosAlbum',      success () {//用戶允許授權，保存圖片到相冊       that.savePhoto();      },      fail () {//用戶點擊拒絕授權，跳轉到設置頁，引導用戶授權       wx.openSetting({        success () {         wx.authorize({          scope: 'scope.writePhotosAlbum',          success() {           that.savePhoto();          }         })        }       })      }     })    } else {//用戶已授權，保存到相冊     that.savePhoto()    }   }  }) },//保存圖片到相冊，提示保存成功 savePhoto() {  let that = this  wx.downloadFile({   url: that.data.imgUrl,   success: function (res) {    wx.saveImageToPhotosAlbum({     filePath: res.tempFilePath,     success(res) {      wx.showToast({       title: '保存成功',       icon: "success",       duration: 1000      })     }    })   }  }) }