代码如下：
html
<div style="display:flex;gap:20px;height:100vh;">
  <textarea id="editor" style="width:50%;padding:1rem;font-size:14px;"></textarea>
  <div id="preview" class="vp-doc" style="width:50%;overflow:auto;padding:1rem;"></div>
</div>

<script type="module">
import MarkdownIt from "https://esm.sh/markdown-it@14";
import mkContainer from "https://esm.sh/markdown-it-container";
import mkTask from "https://esm.sh/markdown-it-task-lists";
import mkAnchor from "https://esm.sh/markdown-it-anchor";
import mkAttrs from "https://esm.sh/markdown-it-attrs";
import { getHighlighter } from "https://esm.sh/shiki@1.22.0";

// 系统主题
const prefersDark = window.matchMedia("(prefers-color-scheme: dark)");
const getTheme = () => prefersDark.matches ? "vitesse-dark" : "vitesse-light";

// Shiki 高亮
const highlighter = await getHighlighter({
  themes: ["vitesse-dark","vitesse-light"],
  langs: ["js","ts","bash","json","html","css","markdown","yaml"]
});

// 解析 ``` 后元信息，例如 {2,4-5} ln
function parseMeta(meta=""){
  const res = {highlight:[], lineNumbers:false};
  const range = meta.match(/{([^}]+)}/);
  if(range){
    const parts = range[1].split(",");
    for(const p of parts){
      if(p.includes("-")){
        const [a,b] = p.split("-").map(Number);
        for(let i=a;i<=b;i++) res.highlight.push(i);
      } else { const n=Number(p); if(!isNaN(n)) res.highlight.push(n); }
    }
  }
  if(/\b(ln|line-numbers)\b/i.test(meta)) res.lineNumbers = true;
  return res;
}

// 将 [!NOTE]、[!TIP] 等行首标记转成 div.custom-block
function markdownCustomBlock(md){
  const map = {
    NOTE: "tip",
    TIP: "tip",
    IMPORTANT: "important",
    WARNING: "warning",
    CAUTION: "caution"
  };
  md.core.ruler.push("custom_block", state => {
    const tokens = state.tokens;
    for(let i=0;i<tokens.length;i++){
      if(tokens[i].type==="paragraph_open"){
        const contentToken = tokens[i+1];
        if(contentToken && contentToken.type==="inline"){
          const match = contentToken.content.match(/^\[!(NOTE|TIP|IMPORTANT|WARNING|CAUTION)\]\s*(.*)/);
          if(match){
            const type = map[match[1]];
            const text = match[2];
            tokens[i].type = "html_block";
            tokens[i].content = `<div class="custom-block ${type}">`;
            contentToken.type = "html_block";
            contentToken.content = text;
            const closeToken = tokens[i+2];
            if(closeToken && closeToken.type==="paragraph_close") closeToken.type="html_block", closeToken.content="</div>";
          }
        }
      }
    }
  });
}

const md = new MarkdownIt({
  html:true, linkify:true, typographer:true,
  highlight:(code,lang,meta)=>{
    const {highlight,lineNumbers}=parseMeta(meta);
    const lineOptions = highlight.map(line=>({line,classes:["highlighted"]}));
    try{
      let html = highlighter.codeToHtml(code,{lang:lang||"text",theme:getTheme(),lineOptions});
      if(lineNumbers) html = html.replace('<pre class="shiki"','<pre class="shiki has-line-numbers"');
      return html;
    }catch{
      return `<pre><code>${md.utils.escapeHtml(code)}</code></pre>`;
    }
  }
})
.use(mkTask,{enabled:true})
.use(mkAttrs)
.use(mkAnchor,{permalink:mkAnchor.permalink.ariaHidden({})})
.use(markdownCustomBlock);

// 可选 :::tip / :::warning 容器
md.use(mkContainer,"tip",{render:(tokens,idx)=>tokens[idx].nesting===1?'<div class="custom-block tip">':'</div>'});
md.use(mkContainer,"warning",{render:(tokens,idx)=>tokens[idx].nesting===1?'<div class="custom-block warning">':'</div>'});

const editor=document.getElementById("editor");
const preview=document.getElementById("preview");

function render(){ preview.innerHTML = md.render(editor.value); }

prefersDark.addEventListener("change", render);
editor.addEventListener("input", render);

editor.value=`# VitePress 风格 + Shiki 高亮 Demo

[!NOTE] 强调用户在快速浏览文档时也不应忽略的重要信息
[!TIP] 有助于用户顺利达成目标的建议性信息
[!IMPORTANT] 对用户达成目标至关重要的信息
[!WARNING] 存在风险，需要立即关注的内容
[!CAUTION] 行为可能带来的负面影响

:::tip
这是一个 tip 容器
:::

:::warning
这是一个 warning 容器
:::

- [ ] 待办
- [x] 已完成

## 代码示例（行高亮 + 行号）
\`\`\`js {2,4} ln
function greet(name) {
  console.log("Hello,", name);
}
greet("Shiki");
\`\`\`

## YAML 示例
\`\`\`yaml
title: hello
items:
  - a
  - b
\`\`\`
`;

render();
</script>

<!-- VitePress CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/vars.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/base.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/fonts.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/icons.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/utils.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/components/custom-block.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/components/vp-code.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/components/vp-doc.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vitepress@1.6.4/dist/client/theme-default/styles/components/vp-table.css">

<!-- 优化配色：代码块 + custom-block -->
<style>
/* 代码块 */
.vp-doc pre.shiki{
  border-radius:12px; overflow:auto; padding:1rem;
  font-size:14px; line-height:1.5; margin:1em 0;
  box-shadow:0 2px 6px rgba(0,0,0,0.05);
   background-color: #f5f5f5 !important; /* 浅灰背景 */
  color: #1e1e2e !important;
}
@media (prefers-color-scheme: dark){
  .vp-doc pre.shiki{ background-color:#2e2e3e; color:#f0f0f0; }
}
.vp-doc pre.shiki code{ counter-reset:line; }
.vp-doc pre.shiki .line{
  display:block; min-height:1.25rem; counter-increment:line; padding-left:0.5em;
}
.vp-doc pre.shiki.has-line-numbers .line::before{
  content:counter(line); display:inline-block; width:2.5em; margin-right:1em; text-align:right; opacity:.5; user-select:none;
}
.vp-doc pre.shiki .line.highlighted{
  background: rgba(255,245,157,0.2);
  margin:0 calc(-1rem); padding:0 1rem;
}

/* custom-block 背景色 */
.custom-block.tip{ background-color:#e0f7ff; color:#055160; }
.custom-block.warning{ background-color:#fff4e5; color:#663c00; }
.custom-block.important{ background-color:#fff0f0; color:#660000; }
.custom-block.caution{ background-color:#fff8e0; color:#665500; }

/* 深色模式 custom-block */
@media (prefers-color-scheme: dark){
  .custom-block.tip{ background-color:#004c66; color:#b0eaff; }
  .custom-block.warning{ background-color:#664400; color:#ffe5b0; }
  .custom-block.important{ background-color:#660000; color:#ffb0b0; }
  .custom-block.caution{ background-color:#665500; color:#fff4b0; }
}
</style>
渲染单页和页面css问题迟早需要解决，但是目前还需要进一步改善。
效果图：
使用vitepress风格+markdownit渲染页面 可以实时修改预览

使用vitepress风格+markdownit渲染页面可以实时修改预览
