你不能在文本区域中渲染标记。

但是，你可以通过小心地在文本区域后面放置一个div并在那里添加高亮标记来伪造它。

JavaScript负责同步内容和滚动位置。

var $container = $('.container'); var $backdrop = $('.backdrop'); var $highlights = $('.highlights'); var $textarea = $('textarea'); var $toggle = $('button'); var ua = window.navigator.userAgent.toLowerCase(); var isIE = !!ua.match(/msie|trident\/7|edge/); var isWinPhone = ua.indexOf('windows phone') !== -1; var isIOS = !isWinPhone && !!ua.match(/ipad|iphone|ipod/); function applyHighlights(text) { text = text .replace(/\n$/g, '\n\n') .replace(/[A-Z].*?\b/g, '<mark>$&</mark>'); if (isIE) { // IE wraps whitespace differently in a div vs textarea, this fixes it text = text.replace(/ /g, ' <wbr>'); } return text; } function handleInput() { var text = $textarea.val(); var highlightedText = applyHighlights(text); $highlights.html(highlightedText); } function handleScroll() { var scrollTop = $textarea.scrollTop(); $backdrop.scrollTop(scrollTop); var scrollLeft = $textarea.scrollLeft(); $backdrop.scrollLeft(scrollLeft); } function fixIOS() { $highlights.css({ 'padding-left': '+=3px', 'padding-right': '+=3px' }); } function bindEvents() { $textarea.on({ 'input': handleInput, 'scroll': handleScroll }); } if (isIOS) { fixIOS(); } bindEvents(); handleInput(); @import url(https://fonts.googleapis.com/css?family=Open+Sans); *, *::before, *::after { box-sizing: border-box; } body { margin: 30px; background-color: #fff; caret-color: #000; } .container, .backdrop, textarea { width: 460px; height: 180px; } .highlights, textarea { padding: 10px; font: 20px/28px 'Open Sans', sans-serif; letter-spacing: 1px; } .container { display: block; margin: 0 auto; transform: translateZ(0); -webkit-text-size-adjust: none; } .backdrop { position: absolute; z-index: 1; border: 2px solid #685972; background-color: #fff; overflow: auto; pointer-events: none; transition: transform 1s; } .highlights { white-space: pre-wrap; word-wrap: break-word; color: #000; } textarea { display: block; position: absolute; z-index: 2; margin: 0; border: 2px solid #74637f; border-radius: 0; color: transparent; background-color: transparent; overflow: auto; resize: none; transition: transform 1s; } mark { border-radius: 3px; color: red; background-color: transparent; } <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div class="container"> <div class="backdrop"> <div class="highlights"></div> </div> <textarea>All capitalized Words will be highlighted. Try Typing to see how it Works</textarea> </div>

原笔:https://codepen.io/lonekorean/pen/gaLEMR

以下是我对程序员的类似问题(在线代码编辑器)的回答:

首先，你可以看看这篇文章: Wikipedia -基于javascript的源代码编辑器的比较。

为了了解更多，这里有一些工具似乎适合你的要求:

EditArea ― Demo as FileEditor who is a Yii Extension ― (Apache Software License, BSD, LGPL) Here is EditArea, a free javascript editor for source code. It allow to write well formated source code with line numerotation, tab support, search & replace (with regexp) and live syntax highlighting (customizable). CodePress ― Demo of Joomla! CodePress Plugin ― (LGPL) ― It doesn't work in Chrome and it looks like development has ceased. CodePress is web-based source code editor with syntax highlighting written in JavaScript that colors text in real time while it's being typed in the browser. CodeMirror ― One of the many demo ― (MIT-style license + optional commercial support) CodeMirror is a JavaScript library that can be used to create a relatively pleasant editor interface for code-like content ― computer programs, HTML markup, and similar. If a mode has been written for the language you are editing, the code will be coloured, and the editor will optionally help you with indentation Ace Ajax.org Cloud9 Editor ― Demo ― (Mozilla tri-license (MPL/GPL/LGPL)) Ace is a standalone code editor written in JavaScript. Our goal is to create a web based code editor that matches and extends the features, usability and performance of existing native editors such as TextMate, Vim or Eclipse. It can be easily embedded in any web page and JavaScript application. Ace is developed as the primary editor for Cloud9 IDE and the successor of the Mozilla Skywriter (Bespin) Project.

我推荐使用EditArea进行语法高亮文本区域的实时编辑。

总之，以下是我们可以选择的:

Highlight.js Prism.js & Microlight.js 谷歌prettyprint Pygments.org Hilite.me Microlight.js 否则，你可以尝试一个轻量级的定制- https://css-tricks.com/creating-an-editable-textarea-that-supports-syntax-highlighted-code/

为了节省您的时间和精力，最好在这些范围内进一步调查。

为什么要将它们表示为文本区域?这是我最喜欢的:

http://alexgorbatchev.com/wiki/SyntaxHighlighter

但如果你使用的是CMS，可能有更好的插件。例如，wordpress有一个进化的版本:

http://www.viper007bond.com/wordpress-plugins/syntaxhighlighter/

你可以突出显示<textarea>中的文本，使用一个<div>小心地放在它后面。

检查突出文本在文本区域。