clickBtn: function() {
				let that = this;
				if (that.btnText == '拍照') {
					let ctx = wx.createCameraContext();
					ctx.takePhoto({
						quality: 'high',
						success: function(resp) {
							// console.log(resp.tempImagePath);
							console.log(resp);
							that.photoPath = resp.tempImagePath;  
							that.showCamera = false;
							that.showImage = true;
							that.btnText = '签到';
						}
					});
				} 

使用真机调试（1.0和2.0都试过），点击在线签到后，代码执行到这里会报错，说是什么 JsApi请求参数非法，不知道怎么解决。请老师帮忙看看。

VM502:2 [wxapplib]] backgroundfetch privacy fail {"errno":101,"errMsg":"private_getBackgroundFetchData:fail private_getBackgroundFetchData:fail:jsapi invalid request data"}