var downloadTask = uni.downloadFile({
					url: ioii_invoice_pic_url,
					// #ifdef MP-WEIXIN
					filePath: wx.env.USER_DATA_PATH + "/" + filename,
					// #endif
					success: (res) => {
						console.log('res', res)
						this.downloading = false
						if (res.statusCode === 200) {
							// #ifdef MP-WEIXIN
							const filePath = res.filePath
							if (fileExt === 'jpg' || fileExt === 'jpeg' || fileExt === 'png' || fileExt ===
								'gif') {
								//如果是图片走这里
								uni.saveImageToPhotosAlbum({ //保存图片到系统相册。
									filePath: filePath, //图片文件路径
									success: function() {
										uni.showToast({
											title: '发票保存成功',
											icon: 'none',
										});
										uni.previewImage({
											current: 0,
											urls: [ioii_invoice_pic_url],
										})
									},
									fail: function(e) {
										uni.showToast({
											title: '发票保存失败',
											icon: 'none',
										});
									}
								});
							} else {
								wx.openDocument({
									filePath: filePath,
									fileType: fileExt,
									showMenu: true,
									success: (res) => {
										console.log('打开文档成功')
									},
									fail: function(err) {
										console.error('打开失败', err);
									}
								})
							}
							// #endif

							// #ifdef H5
							//this.h5SaveFile(res.tempFilePath, filename)
							//this.common.toast(instructionUrl, 2000, false)
							//this.h5SaveFile(instructionUrl, filename)
							// #endif
						}
					},
					fail: (err) => {
						console.error('', err)
						this.downloading = false
						//this.common.toast(err, 2000, false)
						this.common.toast('下载失败', 2000, false)
					}
				})