小程序相机点击第一次无反应，第二次才能实现拍照

onLoad() {

    this.cameraCTX = wepy.createCameraContext()

}

takePhoto() {

    this.cameraCTX.takePhoto({

        success: res => {

            this.photo = {

            show: true,

            info: res.tempImagePath

            }

        },

        error: error => {

            console.log(error)

        }

    })

}