tt.getSystemInfo({
  success(res) {
    const screenWidth = res.screenWidth;
    const screenHeight = res.screenHeight;
    const recorder = tt.getGameRecorderManager();
    var maskInfo = recorder.getMark(); //获取水印的宽高
    var x = (screenWidth - maskInfo.markWidth) / 2;
    var y = (screenHeight - maskInfo.markHeight) / 2;
    recorder.onStart((res) => {
      console.log("录屏开始");
      // do something;
    });
    //添加水印并且居中处理
    recorder.start({
      duration: 30,
      isMarkOpen: true,
      locLeft: x,
      locTop: y,
    });
  },
});