要在网页中实现正则表达式的JavaScript代码高亮，可以采用Prism.js这个JavaScript库。
下面是实现的具体步骤：
1. 引入Prism.js
在网页的
标签内添加下面的代码来引入Prism.js库：<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/themes/prism.min.css" integrity="sha512-HHbPbE9m6zsRe6aZ+GmJf1WWlDTlVA3EUi4/2vmJQ5KAHHQNY+Qw4b7K9R77tLgn/K4MNjDKVhNyWxL3k25+uA==" crossorigin="anonymous" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/prism.min.js" integrity="sha512-ZUzMV9CJxKTWz9m3CQGk8JqWeaJMt9p5U6t8AdEwi8XtL2IK9jRucMqlozJemAlmFw369fdM5gouBEPtxik+tw==" crossorigin="anonymous"></script>
此外，如果要高亮显示HTML代码，在
标签内还需要添加下面的代码来引入Prism.js的HTML插件：<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/plugins/toolbar/prism-toolbar.min.css" integrity="sha512-sutdAPwBt5Nf/8L2y0aNmYpCE3Yuf8YyPjaF+CrMnGsSrS71VRXJaL0v+Hwij2a0gP8eS6lfb/73MKepDhynqg==" crossorigin="anonymous" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/plugins/toolbar/prism-toolbar.min.js" integrity="sha512-BF3p3hVhapHzvYtsuHB9x8Ss4qYfxAGsyoXErwuVqHr3zTjfQoPa3HHYqyEIwS55ojKtP1m7LbJ999rG/Rn3cQ==" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/plugins/show-language/prism-show-language.min.js" integrity="sha512-EKvGRnTnMPoIKf3mSuOC62753MyJFz3TGBlQu0MiaIMEiRjqH5QJqt6KvEe8fKRAzO968m98EU+9dj+Wk/7GnA==" crossorigin="anonymous"></script>
2. 编写JavaScript代码
编写JavaScript代码来初始化Prism.js，并将需要高亮显示的代码放入
标签内。示例代码如下：<!DOCTYPE html> <html> <head> <title>Prism.js Demo</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/themes/prism.min.css" integrity="sha512-HHbPbE9m6zsRe6aZ+GmJf1WWlDTlVA3EUi4/2vmJQ5KAHHQNY+Qw4b7K9R77tLgn/K4MNjDKVhNyWxL3k25+uA==" crossorigin="anonymous" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/prism.min.js" integrity="sha512-ZUzMV9CJxKTWz9m3CQGk8JqWeaJMt9p5U6t8AdEwi8XtL2IK9jRucMqlozJemAlmFw369fdM5gouBEPtxik+tw==" crossorigin="anonymous"></script> </head> <body> <pre><code class="language-javascript"> function validateEmail(email) { var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; return re.test(String(email).toLowerCase()); } </code></pre> <script> Prism.highlightAll(); </script> </body> </html>上面的代码定义了一个名为validateEmail的函数，并将它放入
标签内。Prism.highlightAll()函数用于初始化Prism.js。此外，标签的class设置为“language-javascript”，表示这是一段JavaScript代码。3. 更多选项
Prism.js还提供了许多选项，可以用来自定义代码高亮的样式。可以在Prism.js的官方文档中查看这些选项的详细说明。
下面是一个更复杂的示例，展示如何用Prism.js高亮显示HTML、CSS和JavaScript代码：
<!DOCTYPE html> <html> <head> <title>Prism.js Demo</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/themes/prism.min.css" integrity="sha512-HHbPbE9m6zsRe6aZ+GmJf1WWlDTlVA3EUi4/2vmJQ5KAHHQNY+Qw4b7K9R77tLgn/K4MNjDKVhNyWxL3k25+uA==" crossorigin="anonymous" /> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/plugins/toolbar/prism-toolbar.min.css" integrity="sha512-sutdAPwBt5Nf/8L2y0aNmYpCE3Yuf8YyPjaF+CrMnGsSrS71VRXJaL0v+Hwij2a0gP8eS6lfb/73MKepDhynqg==" crossorigin="anonymous" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/prism.min.js" integrity="sha512-ZUzMV9CJxKTWz9m3CQGk8JqWeaJMt9p5U6t8AdEwi8XtL2IK9jRucMqlozJemAlmFw369fdM5gouBEPtxik+tw==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/plugins/autoloader/prism-autoloader.min.js" integrity="sha512-OpKiAlY3xKcepM9Bi696VcRZhdMbEY1fv5QecJVIA0MsyJi0yxK7U75fvvV/wiH/VWzlzTK0S2SI43R0tXG5tg==" crossorigin="anonymous"></script> </head> <body> <pre><code class="language-html"> <!DOCTYPE html> <html> <head> <title>Prism.js Demo</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/themes/prism.min.css" integrity="sha512-HHbPbE9m6zsRe6aZ+GmJf1WWlDTlVA3EUi4/2vmJQ5KAHHQNY+Qw4b7K9R77tLgn/K4MNjDKVhNyWxL3k25+uA==" crossorigin="anonymous" /> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/plugins/toolbar/prism-toolbar.min.css" integrity="sha512-sutdAPwBt5Nf/8L2y0aNmYpCE3Yuf8YyPjaF+CrMnGsSrS71VRXJaL0v+Hwij2a0gP8eS6lfb/73MKepDhynqg==" crossorigin="anonymous" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/prism.min.js" integrity="sha512-ZUzMV9CJxKTWz9m3CQGk8JqWeaJMt9p5U6t8AdEwi8XtL2IK9jRucMqlozJemAlmFw369fdM5gouBEPtxik+tw==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.24.1/plugins/autoloader/prism-autoloader.min.js" integrity="sha512-OpKiAlY3xKcepM9Bi696VcRZhdMbEY1fv5QecJVIA0MsyJi0yxK7U75fvvV/wiH/VWzlzTK0S2SI43R0tXG5tg==" crossorigin="anonymous"></script> </head> <body> <h1>Hello World</h1> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis mollis dolor in lectus molestie viverra. Sed vel mauris tellus. Aenean vel lacus vel justo feugiat sagittis vel a mi. Vivamus euismod efficitur magna non sagittis. Nam euismod, urna eget accumsan dignissim, velit lectus aliquet turpis, vitae pretium enim risus dignissim felis.</p> <script type="text/javascript"> console.log("Hello World"); </script> <style> h1 { color: red; } p { font-size: 16px; } </style> </body> </html> </code></pre> <script> Prism.highlightAll(); </script> </body> </html>这个示例包含了HTML、CSS和JavaScript代码，它们都被高亮显示了。注意到我们没有用类名来指定代码块的语言，而是采用了Prism.js Autoloader插件自动识别的功能。
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