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《HTML 简易速速上手小册》第7章：HTML 多媒体与嵌入内容（2024 最新版）
《HTML
简易速速上手小册》
html
前端
文章目录
7.1 在HTML中嵌入视频和音频
7.1.1 基础知识
7.1.2 案例 1：嵌入视频文件
7.1.3 案例 2：嵌入音频文件
7.1.4 案例 3：创建一个视频和音频混合的播放列表
7.2 使用 `
` 嵌入外部内容</li> <li> <ul> <li>7.2.1 基础知识</li> <li>7.2.2 案例 1：嵌入地图</li> <li>7.2.3 案例 2：嵌入视频</li> <li>7.2.4 案例 3：创建一个包含多个`<iframe>`的网页</li> </ul> </li> <li>7.3 管理和优化多媒体内容</li> <li> <ul> <li>7.3.1 基础知识</li> <li>7.3.2 案例 1：优化网页图像</li> <li>7.3.3 案例 2：使用视频流服务</li> <li>7.3.4 案例 3：懒加载图像</li> </ul> </li> </ul> </div> <p></p> <h2>7.1 在HTML中嵌入视频和音频</h2> <h3>7.1.1 基础知识</h3> <ul> <li><strong>视频和音频标签</strong>：HTML5引入了<code><video></code>和<code><audio></code>标签，让嵌入和播放媒体变得简单。就像在你的网页上安装了一个迷你影院和音乐厅。</li> <li><strong>属性和格式</strong>：这些标签支持多种属性，比如<code>controls</code>、<code>autoplay</code>、<code>loop</code>，以及多种文件格式，确保不同的浏览器能播放你的媒体内容。</li> <li><strong>源文件</strong>：使用<code><source></code>标签可以为不同的浏览器提供不同格式的视频和音频文件，保证更广泛的兼容性。</li> </ul> <h3>7.1.2 案例 1：嵌入视频文件</h3> <p>让我们开始嵌入一个视频文件。我们将为不同的浏览器提供不同格式的视频，并添加控件以供用户操作。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>视频嵌入示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>video</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>320<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>240<span class="token punctuation">"</span></span> <span class="token attr-name">controls</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>movie.mp4<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>video/mp4<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>movie.ogg<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>video/ogg<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> Your browser does not support the video tag. <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>video</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <h3>7.1.3 案例 2：嵌入音频文件</h3> <p>接下来，我们将在网页中嵌入一个音频文件，并添加一些基本控件。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>音频嵌入示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>audio</span> <span class="token attr-name">controls</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio.mp3<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio/mpeg<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio.ogg<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio/ogg<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> Your browser does not support the audio element. <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>audio</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <h3>7.1.4 案例 3：创建一个视频和音频混合的播放列表</h3> <p>最后，我们来点挑战性的任务：创建一个包含视频和音频的播放列表，让用户可以从列表中选择他们想看或听的内容。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>混合播放列表<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>我的播放列表<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>video</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>mediaPlayer<span class="token punctuation">"</span></span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>320<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>240<span class="token punctuation">"</span></span> <span class="token attr-name">controls</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>movie.mp4<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>video/mp4<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> Your browser does not support the video tag. <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>video</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>audio</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>mediaPlayer<span class="token punctuation">"</span></span> <span class="token attr-name">controls</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>source</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio.mp3<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>audio/mpeg<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> Your browser does not support the audio element. <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>audio</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span> <span class="token attr-name">onclick</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>playMedia(<span class="token punctuation">'</span>movie.mp4<span class="token punctuation">'</span>, <span class="token punctuation">'</span>video/mp4<span class="token punctuation">'</span>)<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>视频 1<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span> <span class="token attr-name">onclick</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>playMedia(<span class="token punctuation">'</span>movie2.mp4<span class="token punctuation">'</span>, <span class="token punctuation">'</span>video/mp4<span class="token punctuation">'</span>)<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>视频 2<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>li</span> <span class="token attr-name">onclick</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>playMedia(<span class="token punctuation">'</span>audio.mp3<span class="token punctuation">'</span>, <span class="token punctuation">'</span>audio/mpeg<span class="token punctuation">'</span>)<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>音频 1<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>li</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript"> <span class="token keyword">function</span> <span class="token function">playMedia</span><span class="token punctuation">(</span><span class="token parameter">file<span class="token punctuation">,</span> type</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">var</span> player <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'mediaPlayer'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> player<span class="token punctuation">.</span>src <span class="token operator">=</span> file<span class="token punctuation">;</span> player<span class="token punctuation">.</span>type <span class="token operator">=</span> type<span class="token punctuation">;</span> player<span class="token punctuation">.</span><span class="token function">load</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> player<span class="token punctuation">.</span><span class="token function">play</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> </span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <p>通过这些案例，你将能够掌握在网页中嵌入和控制视频及音频的基础技能。从简单的嵌入到创建播放列表，这些知识让你的网站变得更加生动有趣，仿佛赋予了它生命。记住，视觉和听觉的结合可以极大地提升用户体验，所以尽情地利用这些工具吧！</p> <p><a href="http://img.e-com-net.com/image/info8/95dd063287994633b4085eb499661033.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/95dd063287994633b4085eb499661033.jpg" alt="《HTML 简易速速上手小册》第7章：HTML 多媒体与嵌入内容（2024 最新版）_第2张图片" height="512" width="521" style="border:1px solid black;"></a></p> <hr> <h2>7.2 使用 <code><iframe></code> 嵌入外部内容</h2> <h3>7.2.1 基础知识</h3> <ul> <li><strong><code><iframe></code>简介</strong>：<code><iframe></code>（内联框架）是一个HTML元素，它允许您在当前HTML页面上嵌入另一个HTML页面。想象一下，在你的网页上有一个小窗口，可以看到另一个网站的内容。</li> <li><strong>使用场景</strong>：<code><iframe></code>经常用于嵌入如视频、地图、或者其他网站的页面。它就像是网页中的“迷你视窗”，允许用户在不离开当前页面的情况下浏览其他内容。</li> <li><strong>属性</strong>：<code><iframe></code>支持多种属性，包括<code>src</code>（指定嵌入内容的来源）、<code>width</code>和<code>height</code>（设置框架的大小）、<code>frameborder</code>（设置边框的宽度）等。</li> </ul> <h3>7.2.2 案例 1：嵌入地图</h3> <p>假设您想在您的网站上嵌入一个地图，以显示某个地点。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>嵌入地图示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>广州天河体育中心<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>iframe</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>600<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>450<span class="token punctuation">"</span></span> <span class="token attr-name">frameborder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span> <span class="token style-attr"><span class="token attr-name">style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token style language-css"><span class="token property">border</span><span class="token punctuation">:</span>0</span><span class="token punctuation">"</span></span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>https://map.baidu.com/search/%E5%A4%A9%E6%B2%B3%E4%BD%93%E8%82%B2%E4%B8%AD%E5%BF%83/@12616001.349751737,2632395.62058975,18.43z?querytype=s&da_src=shareurl&wd=%E5%A4%A9%E6%B2%B3%E4%BD%93%E8%82%B2%E4%B8%AD%E5%BF%83&c=257&src=0&wd2=%E5%B9%BF%E5%B7%9E%E5%B8%82%E5%A4%A9%E6%B2%B3%E5%8C%BA&pn=0&sug=1&l=13&b=(12582963,2611508;12664883,2653716)&from=webmap&biz_forward=%7B%22scaler%22:2,%22styles%22:%22pl%22%7D&sug_forward=ef23bc7692da590ff4e73ba4&device_ratio=2<span class="token punctuation">"</span></span> <span class="token attr-name">allowfullscreen</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>iframe</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <h3>7.2.3 案例 2：嵌入视频</h3> <p>接下来，让我们在网页中嵌入一个YouTube视频。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>嵌入视频示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>观看我们的视频<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>iframe</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>560<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>315<span class="token punctuation">"</span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>http://t.cn/A6jUEkYB<span class="token punctuation">"</span></span> <span class="token attr-name">frameborder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span> <span class="token attr-name">allow</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture<span class="token punctuation">"</span></span> <span class="token attr-name">allowfullscreen</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>iframe</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <h3>7.2.4 案例 3：创建一个包含多个<code><iframe></code>的网页</h3> <p>最后，我们来创建一个包含多个<code><iframe></code>的网页，比如同时嵌入视频、地图和另一个网站的新闻文章。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>多重嵌入示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>了解更多<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>iframe</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>560<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>315<span class="token punctuation">"</span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>http://t.cn/A6jUEkYB<span class="token punctuation">"</span></span> <span class="token attr-name">frameborder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span> <span class="token attr-name">allowfullscreen</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>iframe</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>iframe</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>600<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>450<span class="token punctuation">"</span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>https://map.baidu.com/search/%E5%A4%A9%E6%B2%B3%E4%BD%93%E8%82%B2%E4%B8%AD%E5%BF%83/@12616001.349751737,2632395.62058975,18.43z?querytype=s&da_src=shareurl&wd=%E5%A4%A9%E6%B2%B3%E4%BD%93%E8%82%B2%E4%B8%AD%E5%BF%83&c=257&src=0&wd2=%E5%B9%BF%E5%B7%9E%E5%B8%82%E5%A4%A9%E6%B2%B3%E5%8C%BA&pn=0&sug=1&l=13&b=(12582963,2611508;12664883,2653716)&from=webmap&biz_forward=%7B%22scaler%22:2,%22styles%22:%22pl%22%7D&sug_forward=ef23bc7692da590ff4e73ba4&device_ratio=2s<span class="token punctuation">"</span></span> <span class="token attr-name">frameborder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span> <span class="token attr-name">allowfullscreen</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>iframe</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>iframe</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>100%<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>500<span class="token punctuation">"</span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>https://example.com/news-article<span class="token punctuation">"</span></span> <span class="token attr-name">frameborder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>iframe</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <p>通过这些案例，您可以看到<code><iframe></code>如何让您在一个网页中方便地展示来自不同来源的内容。使用<code><iframe></code>可以大大增强您的网页的功能性和互动性，让用户在访问您的网站时享受更加丰富的体验。<br> <a href="http://img.e-com-net.com/image/info8/808192e112554b5fb217fe559e4c7f44.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/808192e112554b5fb217fe559e4c7f44.jpg" alt="《HTML 简易速速上手小册》第7章：HTML 多媒体与嵌入内容（2024 最新版）_第3张图片" height="635" width="640" style="border:1px solid black;"></a></p> <hr> <h2>7.3 管理和优化多媒体内容</h2> <h3>7.3.1 基础知识</h3> <ul> <li><strong>多媒体内容的挑战</strong>：虽然多媒体内容可以让网站更加生动有趣，但它们也可能导致网页加载时间变长，影响用户体验。</li> <li><strong>优化图像</strong>：对于图像，使用正确的格式（如JPEG、PNG、WEBP）和压缩技术可以显著减少文件大小，而不损失太多质量。</li> <li><strong>视频和音频的优化</strong>：对于视频和音频，考虑使用流媒体服务，或者预加载技术来平衡加载时间和播放性能。</li> </ul> <h3>7.3.2 案例 1：优化网页图像</h3> <p>假设您的网站有很多高分辨率的图像，我们将通过减少它们的大小来优化加载时间。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>图像优化示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>我的摄影作品<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>optimized-image1.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>优化后的图像1<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>optimized-image2.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>优化后的图像2<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>optimized-image3.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>优化后的图像3<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <p>在这个示例中，假设<code>optimized-image1.jpg</code>、<code>optimized-image2.jpg</code>和<code>optimized-image3.jpg</code>是原始图像经过压缩和大小调整后的版本。</p> <h3>7.3.3 案例 2：使用视频流服务</h3> <p>让我们嵌入一个视频，但这次我们使用视频流服务，如YouTube或Vimeo，以减少主机服务器的负担。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>视频流服务示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>观看我们的视频<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>iframe</span> <span class="token attr-name">width</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>560<span class="token punctuation">"</span></span> <span class="token attr-name">height</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>315<span class="token punctuation">"</span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>http://t.cn/A6jUEkYB<span class="token punctuation">"</span></span> <span class="token attr-name">frameborder</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>0<span class="token punctuation">"</span></span> <span class="token attr-name">allowfullscreen</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>iframe</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <h3>7.3.4 案例 3：懒加载图像</h3> <p>在这个示例中，我们将应用“懒加载”技术，这意味着图像只会在用户滚动到它们时才加载。</p> <pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>懒加载图像示例<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript"> document<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">"DOMContentLoaded"</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">var</span> lazyImages <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span>document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">"img.lazy"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token string">"IntersectionObserver"</span> <span class="token keyword">in</span> window<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">let</span> lazyImageObserver <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">IntersectionObserver</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">entries<span class="token punctuation">,</span> observer</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> entries<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">entry</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>entry<span class="token punctuation">.</span>isIntersecting<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">let</span> lazyImage <span class="token operator">=</span> entry<span class="token punctuation">.</span>target<span class="token punctuation">;</span> lazyImage<span class="token punctuation">.</span>src <span class="token operator">=</span> lazyImage<span class="token punctuation">.</span>dataset<span class="token punctuation">.</span>src<span class="token punctuation">;</span> lazyImage<span class="token punctuation">.</span>classList<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token string">"lazy"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> lazyImageObserver<span class="token punctuation">.</span><span class="token function">unobserve</span><span class="token punctuation">(</span>lazyImage<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> lazyImages<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">lazyImage</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> lazyImageObserver<span class="token punctuation">.</span><span class="token function">observe</span><span class="token punctuation">(</span>lazyImage<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> </span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>h1</span><span class="token punctuation">></span></span>浏览我的作品<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>h1</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>lazy<span class="token punctuation">"</span></span> <span class="token attr-name">data-src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image1.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>我的作品1<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>lazy<span class="token punctuation">"</span></span> <span class="token attr-name">data-src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image2.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>我的作品2<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>img</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>lazy<span class="token punctuation">"</span></span> <span class="token attr-name">data-src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image3.jpg<span class="token punctuation">"</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>我的作品3<span class="token punctuation">"</span></span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span> <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span> </code></pre> <p>在这些案例中，我们展示了如何优化和管理网站的多媒体内容，确保用户体验不受大文件加载时间的影响。从图像压缩到视频流服务，再到懒加载技术，这些方法都是提高网站性能的有效手段。</p> </div> </div> </div> </div> </div> <!--PC和WAP自适应版--> <div id="SOHUCS" sid="1752481816498946048"></div> <script type="text/javascript" src="/views/front/js/chanyan.js"></script> <!-- 文章页-底部 动态广告位 --> <div class="youdao-fixed-ad" id="detail_ad_bottom"></div> </div> <div class="col-md-3"> <div class="row" id="ad"> <!-- 文章页-右侧1 动态广告位 --> <div id="right-1" class="col-lg-12 col-md-12 col-sm-4 col-xs-4 ad"> <div class="youdao-fixed-ad" id="detail_ad_1"> </div> </div> <!-- 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