<p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"> 标签用于显示预格式化的文本，1. 它保留空格和换行，确保内容按原格式显示；2. 默认使用等宽字体（如 courier new），以保证代码对齐和可读性；3. 可通过 css 自定义样式，如字体、背景色、边框及添加滚动条；4. 与 <code> 标签结合使用可增强语义，<pre class="brush:php;toolbar:false"> 负责格式保留，<code> 表示代码内容，也可单独使用 <code> 显示行内代码；5. 在 <pre class="brush:php;toolbar:false"> 中需转义特殊字符为 html 实体，如 <、>、&，以防止被误解析为 html 标签，从而确保代码正确显示。</p><p>@@##@@</p><p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签主要用于显示预格式化的文本。这意味着<a style="color:#f60; text-decoration:underline;" title="浏览器" href="https://www.php.cn/zt/16180.html" target="_blank">浏览器</a>会保留文本中的空格和换行符，这对于展示代码、诗歌或任何需要精确格式的内容非常有用。它能让你所见即所得，避免了手动调整格式的麻烦。</p> <img src="https://img.php.cn/upload/article/001/221/864/175420980618739.png" alt="pre标签的作用是什么？预格式化文本怎么用？"><p>解决方案：</p> <p>使用 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签非常简单。你只需要将需要预格式化的文本放在 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 和 <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div> 标签之间即可。例如：</p> <img src="https://img.php.cn/upload/article/001/221/864/175420980769426.png" alt="pre标签的作用是什么？预格式化文本怎么用？"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><pre class="brush:php;toolbar:false"> function myFunction() { console.log("Hello, world!"); } </pre><div class="contentsignin"></div></div><p>这段代码在浏览器中会按照你输入的格式显示，包括缩进和换行。</p> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签默认使用等宽字体（通常是 Courier New），这有助于对齐文本，特别是在显示代码时。</p> <img src="https://img.php.cn/upload/article/001/221/864/175420980761559.png" alt="pre标签的作用是什么？预格式化文本怎么用？"><h3> <a style="color:#f60; text-decoration:underline;" title="为什么" href="https://www.php.cn/zt/92702.html" target="_blank">为什么</a> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签默认使用等宽字体？</h3> <p>等宽字体（也称为固定宽度字体）的每个字符都占据相同的水平空间。这对于代码的对齐至关重要，因为它可以确保代码的缩进和结构清晰可见。如果使用比例字体（每个字符的宽度不同），代码的对齐可能会混乱，难以阅读。</p> <p>例如，在等宽字体中，字母 "i" 和字母 "m" 占据相同的宽度，而在比例字体中，"i" 比 "m" 窄得多。这种差异在显示代码时会造成很大的影响。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><pre class="brush:php;toolbar:false"> // 等宽字体示例 int i = 1; int num = 100; // 比例字体示例 (不推荐用于代码) int i = 1; int num = 100; </pre><div class="contentsignin"></div></div><p>通过使用等宽字体，<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签能够确保代码的每个部分都清晰对齐，从而提高代码的可读性和可维护性。</p> <h3>如何自定义 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签的样式？</h3> <p>虽然 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签默认提供了一些样式，但你可以使用 CSS 来自定义它的外观。例如，你可以更改字体、颜色、背景颜色、边距等。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><style> pre { font-family: "Courier New", monospace; background-color: #f4f4f4; padding: 10px; border: 1px solid #ccc; overflow: auto; /* 添加滚动条，防止内容溢出 */ } </style> <pre class="brush:php;toolbar:false"> function myFunction() { console.log("Hello, world!"); } </pre><div class="contentsignin"></div></div><p>在这个例子中，我们使用 CSS 将字体设置为 Courier New，添加了背景颜色和边框，并启用了水平滚动条，以防止内容溢出。<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">overflow: auto;</pre><div class="contentsignin"></div></div> 尤其重要，因为它可以确保在内容超出 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签的宽度时，用户仍然可以滚动查看完整的内容。</p> <h3><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签和 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签有什么<a style="color:#f60; text-decoration:underline;" title="区别" href="https://www.php.cn/zt/27988.html" target="_blank">区别</a>？它们应该如何一起使用？</h3> <p><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签用于表示一段代码。它通常与 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签一起使用，以提供更好的语义和样式。<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签本身不会保留空格和换行符，因此需要将其放在 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签内才能正确显示代码的格式。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><pre class="brush:php;toolbar:false"> <code> function myFunction() { console.log("Hello, world!"); } </code> </pre><div class="contentsignin"></div></div><p>在这个例子中，<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签告诉浏览器这段文本是代码，而 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签则负责保留代码的格式。</p> <p>虽然 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签通常与 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签一起使用，但它也可以单独使用，用于在行内显示代码片段。例如：</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><p>使用 <code>console.log()</code> 函数可以在控制台中输出信息。</p></pre><div class="contentsignin"></div></div><p>总的来说，<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签用于显示预格式化的文本，而 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签用于表示代码。它们通常一起使用，以提供更好的语义和样式，但也可以根据需要单独使用。</p> <h3>如何处理 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签中的 HTML 实体？</h3> <p>由于 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 标签会保留文本中的所有字符，包括 HTML 标记，因此你需要使用 HTML 实体来转义特殊字符，例如 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>、<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 和 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">&</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class=’brush:html;toolbar:false;’><pre class="brush:php;toolbar:false"> <code> if (a < b) { console.log("a is less than b"); } </code> </pre><div class="contentsignin"></div></div><p>在这个例子中，我们使用 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 来表示小于号 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>。如果不进行转义，浏览器可能会将 <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div> 解释为 HTML 标记的开始，从而导致显示错误。</p> <p>常用的 HTML 实体包括：</p> <ul> <li><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>：<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div></li> <li><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>：<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">></pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div></li> <li><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">&</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div>：<div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">&</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div><div class="contentsignin"></div></div></li> <li><div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">"</pre><div class="contentsignin"></div></div><div class="contentsignin"></div></div>：<div class="code" style="position:relative; 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