perf(about): 优化页面初始化和渲染性能

- 使用requestIdleCallback优化初始数据获取时机
- 降级方案使用延迟setTimeout避免阻塞主线程
- 引入requestAnimationFrame优化DOM更新避免强制重排
- 为3D球体添加防抖尺寸计算和批量样式更新
- 监听窗口resize事件动态调整3D球体布局
- 添加主题/语言变更的日志记录便于调试

js/about.js

@@ -220,8 +220,15 @@ class DataManager {
     }
 
     init() {
-        setTimeout(() => this.fetchGithub(), 0);
+        // 使用requestIdleCallback或setTimeout优化初始化调用
-        setTimeout(() => this.fetchBlog(), 0);
+        if ('requestIdleCallback' in window) {
+            requestIdleCallback(() => this.fetchGithub(), { timeout: 1000 });
+            requestIdleCallback(() => this.fetchBlog(), { timeout: 1000 });
+        } else {
+            // 降级到setTimeout，但稍后执行以避免阻塞
+            setTimeout(() => this.fetchGithub(), 50);
+            setTimeout(() => this.fetchBlog(), 100);
+        }
     }
 
     // 创建带超时的fetch函数
@@ -336,10 +343,16 @@ class DataManager {
                 <div class="repo-desc">${escapeHtml(dShort)}</div>
             </div>`;
         });
+        
+        // 使用requestAnimationFrame避免强制重排
+        requestAnimationFrame(() => {
             const pc = $('#projects-container');
             pc.removeClass('fade-in');
+            requestAnimationFrame(() => {
                 pc.html(html);
                 pc.addClass('fade-in');
+            });
+        });
     }
 
     // 从RSS获取博客文章
@@ -447,10 +460,16 @@ class DataManager {
                 <div class="b-cat">${escapeHtml(cat)}</div>
             </div>`;
         });
+        
+        // 使用requestAnimationFrame避免强制重排
+        requestAnimationFrame(() => {
             const bc = $('#blog-container');
             bc.removeClass('fade-in');
+            requestAnimationFrame(() => {
                 bc.html(html);
                 bc.addClass('fade-in');
+            });
+        });
     }
 }
 
@@ -585,6 +604,7 @@ class UIManager {
         const themeObserver = new MutationObserver(() => {
             const newTheme = document.documentElement.getAttribute('data-theme');
             const newLang = document.documentElement.getAttribute('data-lang');
+            console.log('Theme/Language changed:', newTheme, newLang);
             // 延迟执行
             setTimeout(() => {
                 // 重新加载整个评论组件
@@ -738,7 +758,28 @@ class UIManager {
         } else {
             // PC: 3D Sphere
             container.classList.remove('mobile-scroll');
-            container.__animToken = Date.now();
+            
+            // 使用防抖优化尺寸计算
+            let resizeTimeout;
+            const updateContainerSize = () => {
+                if (resizeTimeout) {
+                    clearTimeout(resizeTimeout);
+                }
+                resizeTimeout = setTimeout(() => {
+                    init3DSphere();
+                }, 100);
+            };
+            
+            // 初始化3D球体
+            const init3DSphere = () => {
+                // 清除之前的动画
+                if (container.__animToken) {
+                    cancelAnimationFrame(container.__animToken);
+                }
+                
+                // 清空容器
+                container.innerHTML = '';
+                
                 const tags = [];
                 
                 techStack.forEach((item, index) => {
@@ -752,13 +793,13 @@ class UIManager {
                     tags.push({el, x: 0, y: 0, z: 0});
                 });
                 
-            // 动态半径，避免容器溢出
+                // 动态半径，避免容器溢出，使用防抖优化
                 let radius = Math.max(160, Math.min(container.offsetWidth, container.offsetHeight) / 2 - 24);
                 const dtr = Math.PI / 180;
                 let lasta = 1, lastb = 1;
                 let active = false, mouseX = 0, mouseY = 0;
                 
-            // Init positions
+                // 初始化位置
                 tags.forEach((tag, i) => {
                     let phi = Math.acos(-1 + (2 * i + 1) / tags.length);
                     let theta = Math.sqrt(tags.length * Math.PI) * phi;
@@ -792,6 +833,9 @@ class UIManager {
                     let sa = Math.sin(a * dtr), ca = Math.cos(a * dtr);
                     let sb = Math.sin(b * dtr), cb = Math.cos(b * dtr);
                     
+                    // 批量更新样式以减少重排
+                    const fragment = document.createDocumentFragment();
+                    
                     tags.forEach(tag => {
                         let rx1 = tag.x, ry1 = tag.y * ca - tag.z * sa, rz1 = tag.y * sa + tag.z * ca;
                         let ry2 = ry1, rz2 = rx1 * -sb + rz1 * cb;
@@ -807,9 +851,18 @@ class UIManager {
                         let top = tag.y + container.offsetHeight / 2 - tag.el.offsetHeight / 2;
                         tag.el.style.transform = `translate(${left}px, ${top}px) scale(${scale})`;
                     });
-                requestAnimationFrame(update);
+                    
+                    container.__animToken = requestAnimationFrame(update);
                 };
-            update();
+                
+                container.__animToken = requestAnimationFrame(update);
+            };
+            
+            // 初始化3D球体
+            init3DSphere();
+            
+            // 监听窗口大小变化
+            window.addEventListener('resize', updateContainerSize);
         }
     }