text: const { screenWidth, screenHeight, devicePixelRatio } = wx.getSystemInfoSync()
  
  export const innerWidth = screenWidth
  export const innerHeight = screenHeight
  export { devicePixelRatio }
  export const screen = {
    width: screenWidth,
    height: screenHeight,
    availWidth: innerWidth,
    availHeight: innerHeight,
    availLeft: 0,
    availTop: 0,
  }
  
  export const performance = {
    now: Date.now
  };
  
  export const ontouchstart = null;
  export const ontouchmove = null;
  export const ontouchend = null;