SaveCard: function(e) {

    let that = this;

    console.log('保存');

    var imgSrc = e.currentTarget.dataset.img;

    //获取相册授权

    wx.getSetting({

      success(res) {

        if (!res.authSetting['scope.writePhotosAlbum']) {

          wx.authorize({

            scope: 'scope.writePhotosAlbum',

            success() {

              console.log('授权成功');

              that.img(imgSrc)

            }

          })

        }else{

          that.img(imgSrc)

        }

      }

    })

  },

img: function (imgSrc){

    var imgSrc = imgSrc;

    wx.downloadFile({

      url: imgSrc,

      success: function (res) {

        console.log(res); //图片保存到本地

        wx.saveImageToPhotosAlbum({

          filePath: res.tempFilePath,

          success: function (data) {

            console.log(data);

            wx.showToast({

              title: '保存成功',

              duration: 2000

            })

          },

          fail: function (err) {

            console.log(err);

            if (err.errMsg === "saveImageToPhotosAlbum:fail auth deny") {

              wx.openSetting({

                success(settingdata) {

                  console.log(settingdata)

                  if (settingdata.authSetting['scope.writePhotosAlbum']) {

                    wx.showToast({

                      title: '图片已保存',

                      icon:'none',

                      duration:2000

                    })

                    console.log('获取权限成功，给出再次点击图片保存到相册的提示。')

                  } else {

                    console.log('获取权限失败，给出不给权限就无法正常使用的提示')

                  }

                }

              })

            }

          }

        })

      }

    })

  },