[html] HTML5如何监听video的全屏和退出全屏？

监听fullscreenchange事件

document.addEventListener('fullscreenchange', (event) => {
  // document.fullscreenElement will point to the element that
  // is in fullscreen mode if there is one. If there isn't one,
  // the value of the property is null.
  if (document.fullscreenElement) {
    console.log(`Element: ${document.fullscreenElement.id} entered full-screen mode.`);
  } else {
    console.log('Leaving full-screen mode.');
  }
});

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