javascript - mediaElement.play() 方法返回一个被拒绝的 promise

Question

我无法在移动浏览器上播放我的视频。使用 Safari 远程调试时，我遇到以下问题:
Unhandled Promise Rejection: AbortError: The operation was aborted.
我找到了这个解决方案:https://developers.google.com/web/updates/2017/06/play-request-was-interrupted

但我不知道，如何在我的代码中使用它来解决问题。

<video muted id="video" class="absolute right-0 bottom-0 min-w-full min-h-full w-auto" controls>
    <source src="/path/to/video.mp4" type="video/mp4">
</video>

let video = document.getElementbyId('video');
let video_cta = document.getElementbyId('video_cta');

//this doesn't fix my problem
var videoPromise = video.play();

if (videoPromise != undefined) {
    videoPromise.then(function(_) {
      video.pause();
      video.currentTime = 0;
  });
}

//start video after click the button
video_cta.addEventListener('click' function() {
    video.play()
})

Answer 1

首先是 autoplay属性是必需的。

<video src='...' controls mutedautoplay></video>

当videoPromise是对视频的引用并调用 .play()方法，它将在 Promise 中工作。

const videoPromise = document.querySelector('video').play();

OP 代码中也存在依赖关系 .getElementById()被误用:

let video = document.getElementbyId('video');
let video_cta = document.getElementbyId('video_cta');

Google article OP 中提供的还提到 <source>标签将无法处理 reject适本地:

Use

<video src='...'></video>

Not

<video> <source src='...'> </video>

这应该停止错误消息:

Unhandled Promise Rejection: AbortError: The operation was aborted.

演示 1 使用 Promise和方法.then() . 演示 2 使用 async/await . async function被包裹在一个 IIFE ( Immediately Invoked Function Expression )

演示 1

promise

let cta = document.querySelector('#cta');

const videoPromise = document.querySelector('video').play();

if (videoPromise != undefined) {
  videoPromise.then(_ => {
video.play();
  });
}

cta.addEventListener('click', function() {
  video.play();
});

<video src="https://storage04.dropshots.com/photos6000/photos/1381926/20170326/005609.mp4" id="video" class="absolute right-0 bottom-0 min-w-full min-h-full w-auto" controls autoplay muted></video>
<button id='cta'>CTA</button>

演示 2

async/await

let cta = document.querySelector('#cta');

const video = document.querySelector('video');

(function() {
  playMedia();
})();

async function playMedia() {
  try {
    await video.play();
  } catch (err) {}
}

cta.addEventListener('click', function() {
  video.play();
});

<video src="https://storage04.dropshots.com/photos6000/photos/1381926/20170326/005609.mp4" id="video" class="absolute right-0 bottom-0 min-w-full min-h-full w-auto" controls autoplay muted></video>
<button id='cta'>CTA</button>