let startTime;
let endTime;
startTime = Date.now();
function handleVisibilityChange(page_index) {
  if (document.hidden) {
    endTime = Date.now();
    const timeSpent = endTime - startTime;
    reportTimeSpent(timeSpent, page_index);
    startTime = Date.now();
  }
}

function reportTimeSpent(timeSpent, page_index) {
  const data = {
    reportEvent: 'ua_download_page_stay',
    ext_content: {
      url: window.location.href,
      refer_url: document.referrer,
      client_type: getOperatingSystem(),
      page_index,
      du: timeSpent
    },
    resetParams: {
      original_game_id: "29157",
      sub_action: "cm_lvtm",
    }
  };
  reportTlog(data);
}