保存图片到手机相册

uni.downloadFile({
				url: this.pic,
					success: (res) => {
						if (res.statusCode === 200) {
							uni.saveImageToPhotosAlbum({
								filePath: res.tempFilePath,    //图片地址
								success: function() {
									uni.hideLoading()
									uni.showToast({
										title: "保存成功,请在手机系统相册中打开",
										icon: "none"
									});
								},
								fail: function() {
									uni.hideLoading()
									uni.showToast({
										title: "保存失败，请稍后重试",
										icon: "none"
									});
								}
							});
						}
					}
			});