From 2164ac34cde5eec229a3c16380d0eeebac636fca Mon Sep 17 00:00:00 2001
From: liangliangyy <liangliangyy@gmail.com>
Date: Sun, 28 Sep 2025 17:57:59 +0800
Subject: [PATCH] fix js

---
 blog/static/blog/js/mathjax-loader.js | 142 ++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 blog/static/blog/js/mathjax-loader.js

diff --git a/blog/static/blog/js/mathjax-loader.js b/blog/static/blog/js/mathjax-loader.js
new file mode 100644
index 00000000..c922fc7f
--- /dev/null
+++ b/blog/static/blog/js/mathjax-loader.js
@@ -0,0 +1,142 @@
+/**
+ * MathJax 智能加载器
+ * 检测页面是否包含数学公式，如果有则动态加载和配置MathJax
+ */
+(function() {
+    'use strict';
+    
+    /**
+     * 检测页面是否包含数学公式
+     * @returns {boolean} 是否包含数学公式
+     */
+    function hasMathFormulas() {
+        const content = document.body.textContent || document.body.innerText || '';
+        // 检测常见的数学公式语法
+        return /\$.*?\$|\$\$.*?\$\$|\\begin\{.*?\}|\\end\{.*?\}|\\[a-zA-Z]+\{/.test(content);
+    }
+    
+    /**
+     * 配置MathJax
+     */
+    function configureMathJax() {
+        window.MathJax = {
+            tex: {
+                // 行内公式和块级公式分隔符
+                inlineMath: [['$', '$']],
+                displayMath: [['$$', '$$']],
+                // 处理转义字符和LaTeX环境
+                processEscapes: true,
+                processEnvironments: true,
+                // 自动换行
+                tags: 'ams'
+            },
+            options: {
+                // 跳过这些HTML标签，避免处理代码块等
+                skipHtmlTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code', 'a'],
+                // CSS类控制
+                ignoreHtmlClass: 'tex2jax_ignore',
+                processHtmlClass: 'tex2jax_process'
+            },
+            // 启动配置
+            startup: {
+                ready() {
+                    console.log('MathJax配置完成，开始初始化...');
+                    MathJax.startup.defaultReady();
+                    
+                    // 处理特定区域的数学公式
+                    const contentEl = document.getElementById('content');
+                    const commentsEl = document.getElementById('comments');
+                    
+                    const promises = [];
+                    if (contentEl) {
+                        promises.push(MathJax.typesetPromise([contentEl]));
+                    }
+                    if (commentsEl) {
+                        promises.push(MathJax.typesetPromise([commentsEl]));
+                    }
+                    
+                    // 等待所有渲染完成
+                    Promise.all(promises).then(() => {
+                        console.log('MathJax渲染完成');
+                        // 触发自定义事件，通知其他脚本MathJax已就绪
+                        document.dispatchEvent(new CustomEvent('mathjaxReady'));
+                    }).catch(error => {
+                        console.error('MathJax渲染失败:', error);
+                    });
+                }
+            },
+            // 输出配置
+            chtml: {
+                scale: 1,
+                minScale: 0.5,
+                matchFontHeight: false,
+                displayAlign: 'center',
+                displayIndent: '0'
+            }
+        };
+    }
+    
+    /**
+     * 加载MathJax库
+     */
+    function loadMathJax() {
+        console.log('检测到数学公式，开始加载MathJax...');
+        
+        const script = document.createElement('script');
+        script.src = 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js';
+        script.async = true;
+        script.defer = true;
+        
+        script.onload = function() {
+            console.log('MathJax库加载成功');
+        };
+        
+        script.onerror = function() {
+            console.error('MathJax库加载失败，尝试备用CDN...');
+            // 备用CDN
+            const fallbackScript = document.createElement('script');
+            fallbackScript.src = 'https://polyfill.io/v3/polyfill.min.js?features=es6';
+            fallbackScript.onload = function() {
+                const mathJaxScript = document.createElement('script');
+                mathJaxScript.src = 'https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML';
+                mathJaxScript.async = true;
+                document.head.appendChild(mathJaxScript);
+            };
+            document.head.appendChild(fallbackScript);
+        };
+        
+        document.head.appendChild(script);
+    }
+    
+    /**
+     * 初始化函数
+     */
+    function init() {
+        // 等待DOM完全加载
+        if (document.readyState === 'loading') {
+            document.addEventListener('DOMContentLoaded', init);
+            return;
+        }
+        
+        // 检测是否需要加载MathJax
+        if (hasMathFormulas()) {
+            // 先配置，再加载
+            configureMathJax();
+            loadMathJax();
+        } else {
+            console.log('未检测到数学公式，跳过MathJax加载');
+        }
+    }
+    
+    // 提供重新渲染的全局方法，供动态内容使用
+    window.rerenderMathJax = function(element) {
+        if (window.MathJax && window.MathJax.typesetPromise) {
+            const target = element || document.body;
+            return window.MathJax.typesetPromise([target]);
+        }
+        return Promise.resolve();
+    };
+    
+    // 启动初始化
+    init();
+})();