查看“MediaWiki:Common.js”的源代码

$(function () {
  var $counter = $('<div id="online-counter">当前在线 <span style="color:#a782ff;">👥</span>：<span id="online-number">加载中...</span></div>');
  $('body').append($counter);

  function updateOnlineNumber() {
    $.getJSON('/api/online.php', function (data) {
      $('#online-number').text(data.count || 0);
    }).fail(function () {
      $('#online-number').text('获取失败');
    });
  }

  updateOnlineNumber();
  setInterval(updateOnlineNumber, 30000);
});

mw.loader.load('/js/player-init.js');

if ('serviceWorker' in navigator && !navigator.serviceWorker.controller) {
  navigator.serviceWorker.register('/js/player-sw.js').then(() => location.reload());
}