JavaScript实现简单的Markdown语法解析器

</!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8">
    <script src="https://cdn.staticfile.org/jquery/3.6.1/jquery.min.js"></script>
    <style>
        *{
            padding: 0;
            margin: 0;
            font-family: system-ui,-apple-system,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Hiragino Sans GB,Microsoft YaHei UI,Microsoft YaHei,Arial,sans-serif;
        }
        #app{
            width: 810px;
            height: 400px;
            margin: 30px auto 0;
            padding: 20px 20px;
            background: #00965e;
        }
        #app .md-editor{
            width: 400px;
            height: 400px;
            float: left;
        }
        #app .md-content{
            width: 100%;
            height: 400px;
            outline: none;
            resize: none;
            padding: 10px 10px;
            font-size: 17px;
            border: none;
            background: #eee;
        }
        #app .md-html{
            width: 400px;
            height: 400px;
            float: right;
            background: #eee;
        }
        #app code{
            color: #666;
            padding: 2px 5px;
            background: #fff;
            border-radius: 5px;
            font-size: 14px;
        }
    </style>
</head>
<body>

<h3 style="text-align: center;margin-top: 100px;">JavaScript实现一个简单的MarkDown语法解析器</h3>
<div id="app">
    
    <div class="md-editor">
        <form>
            <textarea name="md-content" class="md-content" placeholder="在这里使用markdown语法编写"></textarea>
        </form>
    </div>
    <div class="md-html">这里会实时显示markdown语法的解析结果</div>
</div>

<script type="text/javascript">

// 解析markdown语法为html
function markdownToHTML(markdownContent) {

  // 处理标题
  markdownContent = markdownContent.replace(/^#\s(.*)$/gm, '<h1>$1</h1>');
  markdownContent = markdownContent.replace(/^##\s(.*)$/gm, '<h2>$1</h2>');
  markdownContent = markdownContent.replace(/^###\s(.*)$/gm, '<h3>$1</h3>');
  markdownContent = markdownContent.replace(/^####\s(.*)$/gm, '<h4>$1</h4>');
  markdownContent = markdownContent.replace(/^#####\s(.*)$/gm, '<h5>$1</h5>');
  markdownContent = markdownContent.replace(/^######\s(.*)$/gm, '<h6>$1</h6>');

  // 处理加粗、斜体、删除线
  markdownContent = markdownContent.replace(/\*\*(.*)\*\*/gm, '<strong>$1</strong>');
  markdownContent = markdownContent.replace(/__(.*)__/gm, '<strong>$1</strong>');
  markdownContent = markdownContent.replace(/\*(.*)\*/gm, '<em>$1</em>');
  markdownContent = markdownContent.replace(/_(.*)_/gm, '<em>$1</em>');
  markdownContent = markdownContent.replace(/~~(.*)~~/gm, '<del>$1</del>');

  // 处理链接和图片
  markdownContent = markdownContent.replace(/\[(.*?)\]\((.*?)\)/gm, '<a href="$2" rel="external nofollow" >$1</a>');
  markdownContent = markdownContent.replace(/!\[(.*?)\]\((.*?)\)/gm, '<img src="$2" alt="$1">');

  // 处理行内代码和代码块
  markdownContent = markdownContent.replace(/`(.*?)`/gm, '<code>$1</code>');
  markdownContent = markdownContent.replace(/```([\s\S]*?)```/gm, '<pre>$1</pre>');

  // 处理换行
  markdownContent = markdownContent.replace(/\n/g, "<br>");

  return markdownContent;
}

// 实时解析markdown语法
$("#app .md-editor .md-content").bind("input propertychange",function(event){

    let md_content = $('#app .md-editor .md-content').val();
    $('#app .md-html').html(markdownToHTML(md_content));
});


</script>
</body>
</html>