优化公式渲染，添加mermaid图渲染支持

public/index.html

@@ -54,6 +54,7 @@
   <script src="%PUBLIC_URL%js/alex/moment.js"></script>
   <script src="https://gw.alipayobjects.com/os/lib/alipay/alex/2.0.19/bundle/alex.all.global.min.js"></script>
   <script src="https://res.wx.qq.com/open/js/jweixin-1.6.0.js"></script>
+  <script src="%PUBLIC_URL%js/editormd/mermaid.min.js"></script>
   <%= htmlWebpackPlugin.tags.bodyTags %>
   <script>
     var _hmt = _hmt || [];

public/js/editormd/editormd.min.js

@@ -1921,7 +1921,7 @@
                     } catch (error) {
                       renderString = `<p style="color:#cc0000" title="${ error.message }">${ token.raw }`
                     }
-                    return renderString
+                    return `<p class='editormd-tex'>${renderString}</p>`
                 }
             };
             
@@ -3487,6 +3487,9 @@
             else if (lang === "math" || lang === "latex" || lang === "katex") {
                 return "<p class=\"" + editormd.classNames.tex + "\">" + code + "</p>";
             }
+            else if (code.match(/^sequenceDiagram/) || code.match(/^graph/)) {
+                return '<pre class="mermaid">' + code + '</pre>';
+            }
             else {
 
                 return marked.Renderer.prototype.code.apply(this, arguments);

src/common/marked.js

@@ -145,6 +145,8 @@ renderer.code = function (code, infostring, escaped) {
 
   if (['latex', 'katex', 'math'].indexOf(lang) >= 0) {
     return `<p class='editormd-tex'>${code}</p>`
+  } else if (code.match(/^sequenceDiagram/) || code.match(/^graph/) || lang === 'mermaid') {
+    return '<pre class="mermaid">' + code + '</pre>';
   } else {
     return `<pre class="prettyprint linenums"><code class="language-${infostring}">${escaped ? code : escape(code, true)}</code></pre>\n`
   }
@@ -228,8 +230,9 @@ const kateX = {
   renderer(token) {
     let renderString = ''
     try {
-      renderString = renderToString(token.text, { 
+      renderString = renderToString(token.text || '', { 
         displayMode: token.displayMode,
+        throwOnError: false,
         macros: { 
             "\\mbox": "\\text{#1}",
             "\\textrm": "\\text{#1}",
@@ -240,7 +243,7 @@ const kateX = {
     } catch (error) {
       renderString = `<p style="color:#cc0000" title="${ error.message }">${ token.raw }`
     }
-    return renderString
+    return `<p class='editormd-tex'>${renderString}</p>`
   }
 };
 

src/common/mermaid.js

@@ -0,0 +1,34 @@
+let mermaidPromise = null;
+
+export function loadMermaid() {
+  if (mermaidPromise) {
+    return mermaidPromise; // 防止重复加载
+  }
+
+  // 如果已经存在
+  if (typeof window !== 'undefined' && window.mermaid) {
+    return Promise.resolve(window.mermaid);
+  }
+
+  mermaidPromise = new Promise((resolve, reject) => {
+    const script = document.createElement('script');
+    script.src = `${process.env.PUBLIC_URL}/js/editormd/mermaid.min.js`;
+    script.async = true;
+
+    script.onload = () => {
+      if (window.mermaid) {
+        resolve(window.mermaid);
+      } else {
+        reject(new Error('Mermaid failed to load'));
+      }
+    };
+
+    script.onerror = () => {
+      reject(new Error('Failed to load Mermaid script'));
+    };
+
+    document.head.appendChild(script);
+  });
+
+  return mermaidPromise;
+}

src/components/render-html.jsx

@@ -9,6 +9,7 @@ import axios from 'axios';
 import imgError from '../images/img-error.png'
 
 import { renderToString } from 'katex'
+import { loadMermaid } from '../common/mermaid';
 
 const preRegex = /<pre[^>]*>/g;
 const strRegexSub = /:([a-zA-Z_]+):/g;
@@ -37,6 +38,35 @@ export default ({
     }
   },[owner,projectsId])
 
+useEffect(() => {
+  if (!html || !el.current) return;
+
+  const hasMermaid = html.includes('<pre class="mermaid">');
+  if (!hasMermaid) return;
+
+  loadMermaid()
+    .then((mermaid) => {
+      // 初始化配置
+      if (!window.mermaidInitialized) {
+        mermaid.initialize({
+          startOnLoad: false, // 关闭自动加载
+          theme: 'default',
+        });
+        window.mermaidInitialized = true;
+      }
+
+      try {
+        // 调用 init 渲染当前容器内的 .mermaid 元素
+        mermaid.init(undefined, el.current.querySelectorAll('.mermaid'));
+      } catch (e) {
+        console.error('Mermaid render error:', e);
+      }
+    })
+    .catch(err => {
+      console.error('Failed to load Mermaid:', err);
+    });
+}, [html]);
+
   function getIssueList(){
     let matchQuote = str.match(quoteRegex);
     let array = [];
@@ -100,8 +130,8 @@ export default ({
       }
     }
     rs = rs.replace(/(__special_katext_id_\d+__)/g, (_match, capture) => {
-      const { type, expression } = math_expressions[capture];      
-      return renderToString(_unescape(expression) || '', { displayMode: true, throwOnError: false,macros: { 
+      const { type, expression } = math_expressions[capture];   
+      return renderToString(_unescape(expression) || '', { displayMode: type === 'block', throwOnError: false,macros: { 
         "\\mbox": "\\text{#1}",
         "\\textrm": "\\text{#1}",
         "\\textnormal": "\\text{#1}",