let systemInfo = wx.getSystemInfoSync();
var { pixelRatio, windowWidth, windowHeight } = systemInfo
var pixelRatioX = 720 / windowWidth,
    pixelRatioY = 1230 / windowHeight;

export {
    windowWidth,
    windowHeight,
    pixelRatioX,
    pixelRatioY,
    pixelRatio
}