微信小程序保存海报的方法详解手机开发

          wx.getSetting({ 
            success(res) { 
              if (!res.authSetting['scope.writePhotosAlbum']) { 
                wx.authorize({ 
                  scope: 'scope.writePhotosAlbum', 
                  success() { 
                    console.log('授权成功') 
                  } 
                }) 
              } 
            } 
          })

          var imgSrc = "http://wxserver.knowway.cn/uploadpic/xiangmu/zhongjinwenjuan/images/1/p1_bg.jpg" 
          wx.downloadFile({ 
            url: imgSrc, 
            success: function (res) { 
              console.log('图片保存到本地'); 
              console.log(res); 
              wx.saveImageToPhotosAlbum({ 
                filePath: res.tempFilePath, 
                success: function (data) { 
                  console.log(data); 
                }, 
                fail: function (err) { 
                  console.log(err); 
                  if (err.errMsg === "saveImageToPhotosAlbum:fail auth deny") { 
                    console.log("用户一开始拒绝了，我们想再次发起授权") 
                    console.log('打开设置窗口') 
                    wx.openSetting({ 
                      success(settingdata) { 
                        console.log(settingdata) 
                        if (settingdata.authSetting['scope.writePhotosAlbum']) { 
                          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') 
                        } 
                      } 
                    }) 
                  } 
                } 
              }) 
            } 
          })