JavaScript中的document.onfullscreenchange

本文作者: jsweibo

本文链接: https://jsweibo.github.io/2019/11/14/JavaScript%E4%B8%AD%E7%9A%84document-onfullscreenchange/

摘要

本文主要讲述了：

触发时机

正文

触发时机

当浏览器切入或者切出全屏模式时，将会触发：

目标元素的fullscreenchange事件
包含目标元素的document的fullscreenchange事件

示例：

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
  </head>
  <body>
    <button id="foo" type="button">Fullscreen Display</button>
    <script>
      const foo = document.querySelector('#foo');

      foo.addEventListener('click', function (event) {
        if (document.fullscreenElement === null) {
          this.requestFullscreen();
        } else {
          document.exitFullscreen();
        }
      });

      foo.addEventListener('fullscreenchange', function (event) {
        console.log(event);
      });

      document.addEventListener('fullscreenchange', function (event) {
        console.log(event);
      });
    </script>
  </body>
</html>