自定义Taro的navBar的宽度和高度

本方法是计算自定义navbar的宽度和高度，输出的参数有
navBarHeight, menuBottom,menuHeight, menuRectWidth,windowWidth, windowHeight,具体代码如下：

export function getCustomNavBarRect():
  | {
      navBarHeight: number;
      menuBottom: number;
      menuHeight: number;
      menuRectWidth: number;
      windowWidth: number;
      windowHeight: number;
    }
  | undefined {
  const { statusBarHeight = 0, screenWidth, windowWidth, windowHeight } = Taro.getSystemInfoSync();
  const menuButtonInfo = Taro.getMenuButtonBoundingClientRect();

  const navBarHeight =
    (menuButtonInfo.top - statusBarHeight) * 2 + menuButtonInfo.height + statusBarHeight; // 导航栏高度
  const menuBottom = menuButtonInfo.top - statusBarHeight; // 胶囊距底部间距（顶部间距也是这个）
  const menuHeight = menuButtonInfo.height; // 胶囊高度
  const menuRectWidth = screenWidth - menuButtonInfo.left; // 胶囊宽度（包括距离屏幕右侧的距离）
  const barRect = {
    navBarHeight,
    menuBottom,
    menuHeight,
    menuRectWidth,
    windowWidth,
    windowHeight,
  };

  if (Taro.getStorageSync('customNavBarRect')) return Taro.getStorageSync('customNavBarRect');

  Taro.setStorageSync('customNavBarRect', barRect);
  return barRect;
}