小程序图片下载授权|用户拒绝授权后如何引导用户重新发起授权

		methods: {
			//打开设置授权
			e() {
				uni.openSetting({
					success(res) {
						console.log(res.authSetting)
						uni.showToast({
							icon: 'success',
							title: '授权成功'
						})
					}
				});
			},
			download() {
				const _this = this

				uni.getSetting({
					success(res) {
						if (!res.authSetting['scope.writePhotosAlbum']) {
							uni.authorize({
								scope: 'scope.writePhotosAlbum',
								success(res) {
									console.log(res, '同意授权');
									_this.saveImage()
								},
								fail(err) {
									console.log(err, '拒绝授权');
									uni.showModal({
										title: '提示',
										content: '检测到您没有授权保存图片到相册，为了更好的体验，请前往设置授权',
										success: function(res) {
											if (res.confirm) {
												_this.e()
											} else if (res.cancel) {
												console.log('用户点击取消');

											}
										}
									});
								}
							})
						} else {
							console.log('已经授权');
							_this.saveImage()
						}
					}
				});
			},
			saveImage() {

				const _this = this
				uni.downloadFile({
					url: _this.expression,
					success: function(res) {
						console.log(res);
						if (res.statusCode === 200) {
							uni.saveImageToPhotosAlbum({
								filePath: res.tempFilePath,
								success: function(res) {
									uni.showToast({
										icon:'success',
										title:'保存成功'
									})
								},
								fail: function(err) {
									console.log(err);
									uni.showToast({
										icon: 'error',
										title: '保存失败'
									})
								}
							});
							
						}

					
					
					},
					fail:function(err) {
						console.log(err);
					}
				});
		
			}
		}
	}