1.新增隐私设置

2.优化代码 新增uni.authorize判断

	_saveCode() {
				let that = this;
				console.log('点击了保存图片')
				console.log(this.result)
				uni.authorize({
					scope: 'scope.writePhotosAlbum',
					success(e) {
						console.log(e)
						if (this.result != "") {
							uni.saveImageToPhotosAlbum({
								filePath: that.result,
								success: function() {
									uni.showToast({
										title: '二维码保存成功',
										icon: 'success',
										duration: 2000
									});
								}
							});
						}
					},
					fail(e){
						console.log('失败了')
						console.log(e)
						uni.openSetting({
						  success(res) {
						    console.log(res.authSetting)
						  }
						});
					}
				})

			},