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<title>canvas对视频截图报错:Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement' | 李祖彬的博客</title>
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需求
页面加载完成后，视频如果没有封面图，使用canvas对视频截图作为封面图，并且通过接口传回保存。
实现
canvas对视频截图，十分简单，只需几行代码。
获取页面中的video
let video = document.getElementById('video');
创建canvas并设置画布长和宽
let canvas = do...">
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<time class="dt-published" datetime="2023-08-03T08:32:24.000Z" itemprop="datePublished">2023-08-03</time>
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canvas对视频截图报错:Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement'
</h1>
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<ul>
<li>需求</li>
</ul>
<p>页面加载完成后，视频如果没有封面图，使用canvas对视频截图作为封面图，并且通过接口传回保存。</p>
<ul>
<li>实现</li>
</ul>
<p>canvas对视频截图，十分简单，只需几行代码。</p>
<ol>
<li>获取页面中的video</li>
</ol>
<pre class="line-numbers language-none"><code class="language-none">let video = document.getElementById('video');</code></pre>
<ol start="2">
<li>创建canvas并设置画布长和宽</li>
</ol>
<pre class="line-numbers language-none"><code class="language-none">let canvas = document.createElement('canvas');
canvas.width = video.videoWidth;
canvas.height = video.videoHeight;</code></pre>
<ol start="3">
<li>绘制</li>
</ol>
<pre class="line-numbers language-none"><code class="language-none">let ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, canvas.width, canvas.height);</code></pre>
<ol start="4">
<li>获取图片数据</li>
</ol>
<pre class="line-numbers language-none"><code class="language-none">let dataURI = canvas.toDataURL('image/jpeg');</code></pre>
<p>这里会得到图片的base64数据。但就在这里出现了错误：</p>
<pre class="line-numbers language-none"><code class="language-none">Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.</code></pre>
<p>这是因为video的资源地址与当前页面是跨域状态，只需要在video中添加属性：</p>
<pre class="line-numbers language-none"><code class="language-none">crossorigin="anonymous"</code></pre>
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