Interval example

danmu.js

(function () {
  const messageList = [
    '求手机！', '非常棒', '我要看大长腿', '小电视暗中观察', '为什么我还没中',
    '我要当欧皇', '中了直播开机哦', '求奇迹出现', '呜呜呜不中啊']
  const roomId = window.location.href.match(/\.com\/(\d+)/)[1];
  const bilibiliSendDanmuPost = 'http://live.bilibili.com/msg/send';

  setInterval(function () {
    var message = messageList[parseInt(Math.random() * (messageList.length - 1))] || '小米很棒！！';
    console.log('准备发送: ' + message);
    $.post(bilibiliSendDanmuPost, {
        color: 0xffffff.toString(),
        fontsize: 25,
        mode: 1,
        msg: message,
        rnd: window.DANMU_RND,
        roomid: roomId,
    }, (response) => {
        var parsedResponse = JSON.parse(response);
        if (parsedResponse.code == 0) {
          var d = new Date();
          console.info('发送成功: ' + d.toString());
        }
    })
  }, 1000 * 60 * 5)
  return '开始计时';
})();