uniapp 保存文件到手机

conserve:function(){
						var that = this
						uni.downloadFile({//保存成临时文件
								url: that.img,//要保存的文件路径
								success: (res) =>{
									if (res.statusCode === 200){//保存成功返回200
										uni.saveImageToPhotosAlbum({
											filePath: res.tempFilePath,//返回的临时路径
											success: function(res2) {
												console.log(JSON.stringify(res2))
												uni.showToast({
													title: "保存成功",
													icon: "none"
												});
											},
											fail: function() {
												uni.showToast({
													title: "保存失败，请稍后重试",
													icon: "none"
												});
											}
										});
										
									}
								}
							})
					}