{"id":174,"date":"2025-11-25T09:00:37","date_gmt":"2025-11-25T01:00:37","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=174"},"modified":"2025-11-25T09:00:37","modified_gmt":"2025-11-25T01:00:37","slug":"html5-%e6%92%ad%e6%94%be%e5%99%a8%e5%80%8d%e9%80%9f%e6%92%ad%e6%94%be-%e5%a4%9a%e7%a7%8d%e5%ae%9e%e7%94%a8%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2025\/11\/25\/html5-%e6%92%ad%e6%94%be%e5%99%a8%e5%80%8d%e9%80%9f%e6%92%ad%e6%94%be-%e5%a4%9a%e7%a7%8d%e5%ae%9e%e7%94%a8%e7%a4%ba%e4%be%8b\/","title":{"rendered":"Html5 \u64ad\u653e\u5668\u500d\u901f\u64ad\u653e \u2014 \u591a\u79cd\u5b9e\u7528\u793a\u4f8b"},"content":{"rendered":"\n<p>\u4e0b\u9762\u7ed9\u4f60 4 \u4e2a\u5e38\u89c1\u4e14\u5b9e\u7528\u7684\u793a\u4f8b\uff1a\u6700\u5c0f\u793a\u4f8b\uff08\u76f4\u63a5\u8bbe\u7f6e <code>playbackRate<\/code>\uff09\u3001\u5e26\u500d\u901f\u4e0b\u62c9\u9009\u62e9\u3001\u5e26 \u201c+ \/ -\u201d \u6309\u94ae \u4e0e \u8fdb\u5ea6\u6ed1\u5757\uff0c\u4ee5\u53ca\u517c\u987e <strong>\u4fdd\u6301\u97f3\u9ad8<\/strong> \u7684\u517c\u5bb9\u5199\u6cd5\u3002\u4ee3\u7801\u90fd\u53ef\u4ee5\u76f4\u63a5\u590d\u5236\u5230\u672c\u5730\u8fd0\u884c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u793a\u4f8b 1 \u2014 \u6700\u5c0f\u53ef\u7528\uff1a\u76f4\u63a5\u8bbe\u7f6e\u500d\u901f<\/h1>\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&gt;\n&amp;lt;head&gt;&amp;lt;meta charset=&quot;utf-8&quot;&gt;&amp;lt;title&gt;\u7b80\u5355\u500d\u901f&amp;lt;\/title&gt;&amp;lt;\/head&gt;\n&amp;lt;body&gt;\n  &amp;lt;video id=&quot;video&quot; width=&quot;640&quot; controls src=&quot;your-video.mp4&quot;&gt;&amp;lt;\/video&gt;\n\n  &amp;lt;div&gt;\n    &amp;lt;button onclick=&quot;document.getElementById(&#039;video&#039;).playbackRate = 0.5&quot;&gt;0.5x&amp;lt;\/button&gt;\n    &amp;lt;button onclick=&quot;document.getElementById(&#039;video&#039;).playbackRate = 1&quot;&gt;1x&amp;lt;\/button&gt;\n    &amp;lt;button onclick=&quot;document.getElementById(&#039;video&#039;).playbackRate = 1.5&quot;&gt;1.5x&amp;lt;\/button&gt;\n    &amp;lt;button onclick=&quot;document.getElementById(&#039;video&#039;).playbackRate = 2&quot;&gt;2x&amp;lt;\/button&gt;\n  &amp;lt;\/div&gt;\n&amp;lt;\/body&gt;\n&amp;lt;\/html&gt;\n\n<\/pre><\/div>\n\n\n<p>\u8bf4\u660e\uff1aHTMLMediaElement \u7684 <code>playbackRate<\/code> \u5c5e\u6027\u63a7\u5236\u64ad\u653e\u901f\u5ea6\uff081 = \u6b63\u5e38\u901f\uff09\u3002\u8fd9\u662f\u6700\u7b80\u5355\u3001\u6700\u76f4\u63a5\u7684\u505a\u6cd5\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u793a\u4f8b 2 \u2014 \u4e0b\u62c9\u9009\u62e9\u4e0e\u663e\u793a\u5f53\u524d\u500d\u901f<\/h1>\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&gt;\n&amp;lt;head&gt;&amp;lt;meta charset=&quot;utf-8&quot;&gt;&amp;lt;title&gt;\u4e0b\u62c9\u500d\u901f&amp;lt;\/title&gt;&amp;lt;\/head&gt;\n&amp;lt;body&gt;\n  &amp;lt;video id=&quot;video&quot; width=&quot;640&quot; controls src=&quot;your-video.mp4&quot;&gt;&amp;lt;\/video&gt;\n\n  &amp;lt;label&gt;\u500d\u901f:\n    &amp;lt;select id=&quot;speed&quot;&gt;\n      &amp;lt;option value=&quot;0.5&quot;&gt;0.5x&amp;lt;\/option&gt;\n      &amp;lt;option value=&quot;0.75&quot;&gt;0.75x&amp;lt;\/option&gt;\n      &amp;lt;option value=&quot;1&quot; selected&gt;1x&amp;lt;\/option&gt;\n      &amp;lt;option value=&quot;1.25&quot;&gt;1.25x&amp;lt;\/option&gt;\n      &amp;lt;option value=&quot;1.5&quot;&gt;1.5x&amp;lt;\/option&gt;\n      &amp;lt;option value=&quot;2&quot;&gt;2x&amp;lt;\/option&gt;\n    &amp;lt;\/select&gt;\n  &amp;lt;\/label&gt;\n  &amp;lt;span id=&quot;cur&quot;&gt;\u5f53\u524d: 1x&amp;lt;\/span&gt;\n\n  &amp;lt;script&gt;\n    const v = document.getElementById(&#039;video&#039;);\n    const sel = document.getElementById(&#039;speed&#039;);\n    const cur = document.getElementById(&#039;cur&#039;);\n\n    sel.addEventListener(&#039;change&#039;, () =&gt; {\n      const rate = parseFloat(sel.value);\n      v.playbackRate = rate;\n      cur.textContent = `\u5f53\u524d: ${rate}x`;\n    });\n\n    \/\/ \u5982\u679c\u9875\u9762\u4e0a\u5176\u5b83\u5730\u65b9\u4fee\u6539\u4e86\u901f\u7387\uff0c\u4fdd\u6301 UI \u540c\u6b65\n    v.addEventListener(&#039;ratechange&#039;, () =&gt; {\n      cur.textContent = `\u5f53\u524d: ${v.playbackRate}x`;\n      sel.value = String(v.playbackRate);\n    });\n  &amp;lt;\/script&gt;\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<h1 class=\"wp-block-heading\">\u793a\u4f8b 3 \u2014 \u7ec6\u7c92\u5ea6\u63a7\u5236\uff1a\u6309\u94ae + \u6ed1\u5757 + \u952e\u76d8\u5feb\u6377\u952e<\/h1>\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&gt;\n&amp;lt;head&gt;\n&amp;lt;meta charset=&quot;utf-8&quot;&gt;\n&amp;lt;title&gt;\u7ec6\u7c92\u5ea6\u500d\u901f\u63a7\u5236&amp;lt;\/title&gt;\n&amp;lt;style&gt;\n  .controls { margin-top: 8px; display:flex; gap:8px; align-items:center; }\n&amp;lt;\/style&gt;\n&amp;lt;\/head&gt;\n&amp;lt;body&gt;\n  &amp;lt;video id=&quot;video&quot; width=&quot;640&quot; controls src=&quot;your-video.mp4&quot;&gt;&amp;lt;\/video&gt;\n\n  &amp;lt;div class=&quot;controls&quot;&gt;\n    &amp;lt;button id=&quot;decrease&quot;&gt;-&amp;lt;\/button&gt;\n    &amp;lt;input id=&quot;rateRange&quot; type=&quot;range&quot; min=&quot;0.25&quot; max=&quot;3&quot; step=&quot;0.05&quot; value=&quot;1&quot; \/&gt;\n    &amp;lt;button id=&quot;increase&quot;&gt;+&amp;lt;\/button&gt;\n    &amp;lt;span id=&quot;label&quot;&gt;1.00x&amp;lt;\/span&gt;\n  &amp;lt;\/div&gt;\n\n  &amp;lt;script&gt;\n    const v = document.getElementById(&#039;video&#039;);\n    const r = document.getElementById(&#039;rateRange&#039;);\n    const label = document.getElementById(&#039;label&#039;);\n    const dec = document.getElementById(&#039;decrease&#039;);\n    const inc = document.getElementById(&#039;increase&#039;);\n\n    function setRate(rate) {\n      \/\/ \u9650\u5236\u7cbe\u5ea6\u5230\u4e24\u4f4d\u5c0f\u6570\n      rate = Math.round(rate * 100) \/ 100;\n      v.playbackRate = rate;\n      r.value = rate;\n      label.textContent = rate.toFixed(2) + &#039;x&#039;;\n    }\n\n    r.addEventListener(&#039;input&#039;, () =&gt; setRate(parseFloat(r.value)));\n    dec.addEventListener(&#039;click&#039;, () =&gt; setRate(Math.max(0.25, parseFloat(r.value) - 0.05)));\n    inc.addEventListener(&#039;click&#039;, () =&gt; setRate(Math.min(3, parseFloat(r.value) + 0.05)));\n\n    \/\/ \u952e\u76d8\u5feb\u6377\uff1a\u6309 &gt; \u589e\u901f\uff0c\u6309 &amp;lt; \u51cf\u901f\uff08\u5728\u9875\u9762\u6709\u7126\u70b9\u65f6\uff09\n    window.addEventListener(&#039;keydown&#039;, (e) =&gt; {\n      if (e.key === &#039;&gt;&#039; || e.key === &#039;.&#039;) setRate(Math.min(3, parseFloat(r.value) + 0.1));\n      if (e.key === &#039;&amp;lt;&#039; || e.key === &#039;,&#039;) setRate(Math.max(0.25, parseFloat(r.value) - 0.1));\n      \/\/ \u76f4\u63a5\u6309\u6570\u5b57\u952e\u5207\u6362\u5e38\u7528\u901f\u5ea6\uff08\u4f8b\u5982\u6309 1 -&gt; 1x\uff09\n      if (e.key &gt;= &#039;0&#039; &amp;amp;&amp;amp; e.key &amp;lt;= &#039;9&#039;) {\n        const map = { &#039;1&#039;:1, &#039;2&#039;:1.25, &#039;3&#039;:1.5, &#039;4&#039;:2 };\n        if (map&#x5B;e.key]) setRate(map&#x5B;e.key]);\n      }\n    });\n\n    \/\/ \u4fdd\u8bc1\u5f53\u89c6\u9891\u81ea\u8eab\u6539\u53d8 rate \u65f6 UI \u66f4\u65b0\n    v.addEventListener(&#039;ratechange&#039;, () =&gt; {\n      r.value = v.playbackRate;\n      label.textContent = v.playbackRate.toFixed(2) + &#039;x&#039;;\n    });\n  &amp;lt;\/script&gt;\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<h1 class=\"wp-block-heading\">\u793a\u4f8b 4 \u2014 \u5173\u4e8e\u201c\u4fdd\u6301\u97f3\u9ad8\uff08preserve pitch\uff09\u201d\u4e0e\u517c\u5bb9\u5199\u6cd5<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u76f4\u63a5\u6539\u53d8 <code>playbackRate<\/code> \u4f1a\u6539\u53d8\u64ad\u653e\u901f\u5ea6\u3002\u73b0\u4ee3\u6d4f\u89c8\u5668\u901a\u5e38\u4f1a<strong>\u4fdd\u7559\u6216\u4fee\u6b63\u97f3\u9ad8<\/strong>\uff08\u5373\u4e0d\u4f1a\u8ba9\u58f0\u97f3\u53d8\u201c\u5c16\u201d\u6216\u201c\u4f4e\u6c89\u201d\uff09\uff0c\u4f46\u4e0d\u540c\u6d4f\u89c8\u5668\u5386\u53f2\u4e0a\u6709\u4e0d\u540c\u5c5e\u6027\u540d\u3002<\/li>\n\n\n\n<li>\u4e3a\u517c\u5bb9\u8001\u6d4f\u89c8\u5668\uff0c\u4f60\u53ef\u4ee5\u8bbe\u7f6e\u8fd9\u4e9b\u975e\u6807\u51c6\u5c5e\u6027\uff08\u5b89\u5168\u56de\u9000\uff09\uff1a<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nconst v = document.getElementById(&#039;video&#039;);\n\/\/ \u6807\u51c6\uff1apreservesPitch \uff08\u4e0d\u662f\u6240\u6709\u6d4f\u89c8\u5668\u90fd\u5b9e\u73b0\uff09\nif (&#039;preservesPitch&#039; in v) v.preservesPitch = true;\n\n\/\/ \u5386\u53f2\u524d\u7f00\uff08\u65e7\u7248 Safari \/ Chrome \/ Firefox\uff09\nif (&#039;webkitPreservesPitch&#039; in v) v.webkitPreservesPitch = true;\nif (&#039;mozPreservesPitch&#039; in v) v.mozPreservesPitch = true;\nif (&#039;msPreservesPitch&#039; in v) v.msPreservesPitch = true;\n\n<\/pre><\/div>\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u6ce8\u610f\uff1a\u5c3d\u7ba1\u5927\u591a\u6570\u73b0\u4ee3\u684c\u9762\u6d4f\u89c8\u5668\u4f1a\u505a\u97f3\u9ad8\u4fee\u6b63\uff0c\u4f46\u5728\u67d0\u4e9b\u79fb\u52a8\u8bbe\u5907\u6216\u975e\u5e38\u8001\u7684\u6d4f\u89c8\u5668\u4e0a\uff0c\u97f3\u9ad8\u53ef\u80fd\u968f\u901f\u7387\u6539\u53d8\u800c\u4ea7\u751f\u7578\u53d8\u3002\u5982\u679c\u5bf9\u97f3\u9ad8\u6709\u4e25\u683c\u8981\u6c42\uff08\u5c24\u5176\u662f\u5bf9\u7eaf\u97f3\u9891\u7684<strong>\u9ad8\u8d28\u91cf\u65f6\u95f4\u4f38\u7f29<\/strong>\uff09\uff0c\u9700\u8981\u4f7f\u7528\u4e13\u95e8\u7684\u97f3\u9891\u5904\u7406\u5e93\uff08\u5982 <code>soundtouch.js<\/code>\u3001<code>wavesurfer.js<\/code> \u7684 time-stretch \u63d2\u4ef6 \u6216 WebAudio \u7684\u66f4\u590d\u6742\u5b9e\u73b0\uff09\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">\u8fdb\u9636\u63d0\u793a\uff08\u53ef\u9009\uff09<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u9700\u8981\u65e0\u7f1d\u4ece\u4e00\u4e2a\u901f\u7387\u5e73\u6ed1\u8fc7\u6e21\u5230\u53e6\u4e00\u4e2a\u901f\u7387\uff0c\u53ef\u4ee5\u7528 <code>requestAnimationFrame<\/code> \u5728\u77ed\u65f6\u95f4\u5185\u9010\u6b65\u8c03\u6574 <code>playbackRate<\/code>\uff0c\u907f\u514d\u7a81\u53d8\u5e26\u6765\u7684\u542c\u611f\u4e0d\u9002\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u4f60\u7528 H5 \u64ad\u653e\u76f4\u64ad\u6d41\uff08HLS\/DASH\uff09\uff0c\u67d0\u4e9b\u64ad\u653e\u5668\uff08\u5982 video.js + playbackRate plugin\uff09\u53ef\u4ee5\u5904\u7406\u66f4\u597d\u3002<\/li>\n\n\n\n<li>\u5728\u79fb\u52a8\u7aef\u6d4b\u8bd5\u65f6\u6ce8\u610f\uff1a\u90e8\u5206\u5e73\u53f0\u7ad6\u5c4f\u6216\u7701\u7535\u7b56\u7565\u53ef\u80fd\u5f71\u54cd <code>playbackRate<\/code> \u884c\u4e3a\uff0c\u52a1\u5fc5\u591a\u673a\u578b\u6d4b\u8bd5\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u97f3\u9891-only \u4e14\u9700\u8981\u9ad8\u8d28\u91cf time-stretch\uff0c\u8003\u8651\u7528 WebAudio + granular\/time-domain algorithms \u6216\u73b0\u6210\u5e93\uff08\u4f1a\u6bd4\u76f4\u63a5\u8bbe\u7f6e <code>playbackRate<\/code> \u66f4\u590d\u6742\u4f46\u6548\u679c\u66f4\u597d\uff09\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0b\u9762\u7ed9\u4f60 4 \u4e2a\u5e38\u89c1\u4e14\u5b9e\u7528\u7684\u793a\u4f8b\uff1a\u6700\u5c0f\u793a\u4f8b\uff08\u76f4\u63a5\u8bbe\u7f6e playbackRate\uff09&#8230; <a class=\"more-link\" href=\"https:\/\/www.52runoob.com\/index.php\/2025\/11\/25\/html5-%e6%92%ad%e6%94%be%e5%99%a8%e5%80%8d%e9%80%9f%e6%92%ad%e6%94%be-%e5%a4%9a%e7%a7%8d%e5%ae%9e%e7%94%a8%e7%a4%ba%e4%be%8b\/\">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-174","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\/174","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=174"}],"version-history":[{"count":1,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/174\/revisions"}],"predecessor-version":[{"id":175,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/posts\/174\/revisions\/175"}],"wp:attachment":[{"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/media?parent=174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/categories?post=174"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52runoob.com\/index.php\/wp-json\/wp\/v2\/tags?post=174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}