#962 全局 ErrorBoundary 隔离组件渲染错误

main.tsx 加 ErrorBoundary 包裹 App,任何组件抛错都会显示在页面上而不是让 root 空白. 基于 #961 诊断:React 18 mount 正常,问题在 App.tsx 组件树.

frontend/src/components/ErrorBoundary.tsx

@@ -0,0 +1,104 @@
+import React from 'react';
+
+interface State {
+  hasError: boolean;
+  error: Error | null;
+  errorInfo: React.ErrorInfo | null;
+}
+
+/**
+ * #962: 全局 ErrorBoundary — 隔离任何组件渲染错误
+ * - 防止单个组件抛错导致整个 React 树崩溃(root 空白)
+ * - 显示错误信息便于诊断
+ * - 提供 reset 按钮,方便恢复
+ */
+export default class ErrorBoundary extends React.Component<{ children: React.ReactNode }, State> {
+  constructor(props: { children: React.ReactNode }) {
+    super(props);
+    this.state = { hasError: false, error: null, errorInfo: null };
+  }
+
+  static getDerivedStateFromError(error: Error): Partial<State> {
+    return { hasError: true, error };
+  }
+
+  componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
+    console.error('[qihu-error-boundary]', error, errorInfo);
+    this.setState({ errorInfo });
+  }
+
+  reset = () => {
+    this.setState({ hasError: false, error: null, errorInfo: null });
+    // Hard reload to clear any bad state
+    if (typeof window !== 'undefined') {
+      window.location.href = window.location.pathname + window.location.search;
+    }
+  };
+
+  render() {
+    if (this.state.hasError && this.state.error) {
+      const { error, errorInfo } = this.state;
+      return (
+        <div style={{
+          padding: '32px',
+          margin: '32px auto',
+          maxWidth: '800px',
+          fontFamily: 'monospace',
+          background: '#fef2f2',
+          border: '2px solid #dc2626',
+          borderRadius: '8px',
+          color: '#1a1a1a',
+        }}>
+          <h1 style={{ color: '#dc2626', marginTop: 0 }}>❌ React 组件渲染错误</h1>
+          <p style={{ color: '#666', marginBottom: '16px' }}>
+            ErrorBoundary 捕获了渲染错误,防止整个应用崩溃。
+          </p>
+          <h3>错误信息</h3>
+          <pre style={{
+            background: '#fff',
+            padding: '12px',
+            borderRadius: '4px',
+            overflow: 'auto',
+            fontSize: '13px',
+            border: '1px solid #fca5a5',
+          }}>
+            {error.name}: {error.message}
+          </pre>
+          {errorInfo && errorInfo.componentStack && (
+            <>
+              <h3>组件堆栈</h3>
+              <pre style={{
+                background: '#fff',
+                padding: '12px',
+                borderRadius: '4px',
+                overflow: 'auto',
+                fontSize: '11px',
+                border: '1px solid #fca5a5',
+                maxHeight: '300px',
+              }}>
+                {errorInfo.componentStack}
+              </pre>
+            </>
+          )}
+          <button
+            onClick={this.reset}
+            style={{
+              marginTop: '16px',
+              padding: '10px 24px',
+              background: '#5B5FED',
+              color: '#fff',
+              border: 'none',
+              borderRadius: '6px',
+              cursor: 'pointer',
+              fontSize: '14px',
+            }}
+          >
+            🔄 重置页面
+          </button>
+        </div>
+      );
+    }
+    return this.props.children;
+  }
+}
+

frontend/src/main.tsx

@@ -2,34 +2,26 @@ import React from 'react';
 import ReactDOM from 'react-dom/client';
 import { BrowserRouter } from 'react-router-dom';
 import App from './App';
+import ErrorBoundary from './components/ErrorBoundary';
 import './styles/global.css';
 
-// #961: 全局错误处理 + 防止 hydration mismatch
 window.addEventListener('error', (e) => {
-  const root = document.getElementById('root');
-  if (root && e.error) {
   console.error('[qihu-global-error]', e.error);
-  }
 });
 window.addEventListener('unhandledrejection', (e) => {
   console.error('[qihu-unhandled-rejection]', e.reason);
 });
 
 const rootEl = document.getElementById('root')!;
-// 清空避免 hydration mismatch
 rootEl.innerHTML = '';
 
-try {
-  ReactDOM.createRoot(rootEl).render(
+ReactDOM.createRoot(rootEl).render(
   <React.StrictMode>
+    <ErrorBoundary>
       <BrowserRouter>
         <App />
       </BrowserRouter>
+    </ErrorBoundary>
   </React.StrictMode>
-  );
-} catch (err) {
-  console.error('[qihu-mount-error]', err);
-  rootEl.innerHTML = '<pre style="padding:20px;color:#dc2626;font-family:monospace">React mount failed: ' + String(err) + '</pre>';
-}
-
+);