const { windowWidth, windowHeight } = tt.getSystemInfoSync();
const targetBannerAdWidth = 200;
// 创建一个居于屏幕底部正中的广告
let bannerAd = tt.createBannerAd({
  adUnitId: "YOUR_AD_UNIT_ID",
  style: {
    width: targetBannerAdWidth,
    top: windowHeight - (targetBannerAdWidth / 16) * 9, // 根据系统约定尺寸计算出广告高度
  },
});
// 也可以手动修改属性以调整广告尺寸
bannerAd.style.left = (windowWidth - targetBannerAdWidth) / 2;
function resize(size) {
  console.log(size.width, size.height);
  bannerAd.style.top = windowHeight - size.height;
  bannerAd.style.left = (windowWidth - size.width) / 2;
}
bannerAd.onResize(resize);
bannerAd.offResize(resize);