iphone7 plus举例，系统相机拍出来尺寸是3024x4032， 但调用小程序的变成720x1280了, qualit设置成high不起作用， 用chooseMedia照片大小正常

const ctx = wx.createCameraContext()

        ctx.takePhoto({

          quality: "high",

          success:(res)=>{

            console.log('输出照相机实例', res)

          }

        })