html限制仅有一个音/视频可播放

/** 多个音频仅能播放一个 */
function audiosPlay() {
  const audios = document.getElementsByTagName('audio');
  const videos = document.getElementsByTagName('video');

  function pauseAll() {
    var self = this;
    [].forEach.call(audios, function (i) {
      if (i !== self) i.pause();
    });
    [].forEach.call(videos, function (i) {
      i.pause();
    });
  }

  [].forEach.call(audios, function (i) {
    i.addEventListener('play', pauseAll.bind(i));
  });
}

/** 多个视频仅能播放一个 */
function videosPlay() {
  const audios = document.getElementsByTagName('audio');
  const videos = document.getElementsByTagName('video');

  function pauseAll() {
    var self = this;
    [].forEach.call(videos, function (i) {
      if (i !== self) i.pause();
    });
    [].forEach.call(audios, function (i) {
      i.pause();
    });
  }

  [].forEach.call(videos, function (i) {
    i.addEventListener('play', pauseAll.bind(i));
  });
}