{"id":214,"date":"2025-11-25T09:56:11","date_gmt":"2025-11-25T01:56:11","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=214"},"modified":"2025-11-25T09:56:11","modified_gmt":"2025-11-25T01:56:11","slug":"%e4%bd%bf%e7%94%a8canvas%e5%af%b9video%e8%a7%86%e9%a2%91%e6%9f%90%e4%b8%80%e5%88%bb%e6%88%aa%e5%9b%be%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2025\/11\/25\/%e4%bd%bf%e7%94%a8canvas%e5%af%b9video%e8%a7%86%e9%a2%91%e6%9f%90%e4%b8%80%e5%88%bb%e6%88%aa%e5%9b%be%e5%8a%9f%e8%83%bd\/","title":{"rendered":"\u4f7f\u7528canvas\u5bf9video\u89c6\u9891\u67d0\u4e00\u523b\u622a\u56fe\u529f\u80fd"},"content":{"rendered":"\n<p>\u660e\u767d\u4e86\uff0c\u963f\u6770\uff01\u4f60\u60f3\u7528 <strong>Canvas \u5bf9 HTML5 <code>&lt;video&gt;<\/code> \u7684\u5f53\u524d\u5e27\u8fdb\u884c\u622a\u56fe<\/strong>\u3002\u6211\u5e2e\u4f60\u6574\u7406\u4e00\u4e2a\u5b8c\u6574\u7684 <strong>\u793a\u4f8b\u4ee3\u7801<\/strong>\uff0c\u7279\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ef\u9009\u62e9\u89c6\u9891\u64ad\u653e\u67d0\u4e00\u65f6\u523b\u622a\u56fe<\/li>\n\n\n\n<li>\u652f\u6301\u4e0b\u8f7d\u622a\u56fe<\/li>\n\n\n\n<li>\u652f\u6301\u663e\u793a\u5728\u9875\u9762\u4e0a<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n&amp;lt;!DOCTYPE html&gt;\n&amp;lt;html lang=&quot;zh-CN&quot;&gt;\n&amp;lt;head&gt;\n&amp;lt;meta charset=&quot;UTF-8&quot;&gt;\n&amp;lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;&gt;\n&amp;lt;title&gt;\u89c6\u9891\u622a\u56fe\u793a\u4f8b&amp;lt;\/title&gt;\n&amp;lt;style&gt;\n  body { font-family: Arial, sans-serif; padding:20px; }\n  video { width: 100%; max-width: 600px; display:block; margin-bottom:10px; }\n  canvas { border:1px solid #ccc; display:block; margin-top:10px; }\n  button { padding:6px 12px; margin-top:10px; }\n&amp;lt;\/style&gt;\n&amp;lt;\/head&gt;\n&amp;lt;body&gt;\n\n&amp;lt;h2&gt;Canvas \u89c6\u9891\u622a\u56fe\u793a\u4f8b&amp;lt;\/h2&gt;\n\n&amp;lt;video id=&quot;video&quot; controls&gt;\n  &amp;lt;source src=&quot;https:\/\/www.w3schools.com\/html\/mov_bbb.mp4&quot; type=&quot;video\/mp4&quot;&gt;\n  \u60a8\u7684\u6d4f\u89c8\u5668\u4e0d\u652f\u6301 video \u6807\u7b7e\u3002\n&amp;lt;\/video&gt;\n\n&amp;lt;button id=&quot;captureBtn&quot;&gt;\u622a\u56fe\u5f53\u524d\u5e27&amp;lt;\/button&gt;\n&amp;lt;canvas id=&quot;canvas&quot;&gt;&amp;lt;\/canvas&gt;\n&amp;lt;a id=&quot;downloadLink&quot; style=&quot;display:block; margin-top:10px;&quot;&gt;\u4e0b\u8f7d\u622a\u56fe&amp;lt;\/a&gt;\n\n&amp;lt;script&gt;\nconst video = document.getElementById(&#039;video&#039;);\nconst canvas = document.getElementById(&#039;canvas&#039;);\nconst ctx = canvas.getContext(&#039;2d&#039;);\nconst captureBtn = document.getElementById(&#039;captureBtn&#039;);\nconst downloadLink = document.getElementById(&#039;downloadLink&#039;);\n\ncaptureBtn.addEventListener(&#039;click&#039;, ()=&gt;{\n  \/\/ \u8bbe\u7f6e canvas \u5c3a\u5bf8\u4e3a\u89c6\u9891\u5c3a\u5bf8\n  canvas.width = video.videoWidth;\n  canvas.height = video.videoHeight;\n\n  \/\/ \u5c06\u5f53\u524d\u89c6\u9891\u5e27\u7ed8\u5236\u5230 canvas\n  ctx.drawImage(video, 0, 0, canvas.width, canvas.height);\n\n  \/\/ \u8bbe\u7f6e\u4e0b\u8f7d\u94fe\u63a5\n  downloadLink.href = canvas.toDataURL(&#039;image\/png&#039;);\n  downloadLink.download = `screenshot_${Date.now()}.png`;\n  downloadLink.textContent = &#039;\u70b9\u51fb\u4e0b\u8f7d\u622a\u56fe&#039;;\n});\n&amp;lt;\/script&gt;\n\n&amp;lt;\/body&gt;\n&amp;lt;\/html&gt;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 \u529f\u80fd\u8bf4\u660e<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u622a\u56fe\u5f53\u524d\u5e27<\/strong>\n<ul class=\"wp-block-list\">\n<li><code>ctx.drawImage(video, 0, 0, width, height)<\/code><\/li>\n\n\n\n<li>\u53ef\u4ee5\u7cbe\u786e\u622a\u53d6\u89c6\u9891\u64ad\u653e\u7684\u4efb\u610f\u4e00\u5e27<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4fdd\u5b58\u56fe\u7247<\/strong>\n<ul class=\"wp-block-list\">\n<li><code>canvas.toDataURL('image\/png')<\/code> \u751f\u6210 Base64 \u56fe\u7247<\/li>\n\n\n\n<li>\u53ef\u8d4b\u503c\u7ed9 <code>&lt;a><\/code> \u6807\u7b7e\u4e0b\u8f7d<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u81ea\u9002\u5e94\u89c6\u9891\u5c3a\u5bf8<\/strong>\n<ul class=\"wp-block-list\">\n<li><code>canvas.width = video.videoWidth<\/code><\/li>\n\n\n\n<li><code>canvas.height = video.videoHeight<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd39 \u62d3\u5c55\u601d\u8def<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ef\u4ee5\u589e\u52a0 <strong>\u622a\u56fe\u5b9a\u65f6\u5668<\/strong>\uff0c\u81ea\u52a8\u6bcf\u9694\u51e0\u79d2\u622a\u56fe<\/li>\n\n\n\n<li>\u53ef\u4ee5\u7ed3\u5408 <strong>File API \/ WebSocket<\/strong> \u4e0a\u4f20\u622a\u56fe<\/li>\n\n\n\n<li>\u53ef\u4ee5\u5728\u622a\u56fe\u4e0a\u7ed8\u5236 <strong>\u6c34\u5370\u6216\u6807\u6ce8<\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u660e\u767d\u4e86\uff0c\u963f\u6770\uff01\u4f60\u60f3\u7528 Canvas \u5bf9 HTML5 &lt;video&gt; &#8230; <a class=\"more-link\" href=\"https:\/\/www.52runoob.com\/index.php\/2025\/11\/25\/%e4%bd%bf%e7%94%a8canvas%e5%af%b9video%e8%a7%86%e9%a2%91%e6%9f%90%e4%b8%80%e5%88%bb%e6%88%aa%e5%9b%be%e5%8a%9f%e8%83%bd\/\">Continue Reading &rarr;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-214","post","type-post","status-publish","format-standard","hentry","category-html5"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/comments?post=214"}],"version-history":[{"count":1,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/214\/revisions"}],"predecessor-version":[{"id":215,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/214\/revisions\/215"}],"wp:attachment":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/media?parent=214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/categories?post=214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/tags?post=214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}