React 中的错误边界：在应用程序中优雅地处理错误

<code class="javascript">import React, { Component } from 'react';

class ErrorBoundary extends Component {
  constructor(props) {
    super(props);
    this.state = { hasError: false, errorInfo: null };
  }

  static getDerivedStateFromError(error) {
    // 更新状态以显示备用 UI
    return { hasError: true };
  }

  componentDidCatch(error, errorInfo) {
    // 将错误详情记录到外部服务
    console.error('Error caught by Error Boundary:', error, errorInfo);
  }

  render() {
    if (this.state.hasError) {
      // 发生错误时，渲染备用 UI
      return <h1>Something went wrong. Please try again later.</h1>;
    }

    return this.props.children; // 没有错误则正常渲染子组件
  }
}

export default ErrorBoundary;</code>

<code class="javascript">import React from 'react';
import ErrorBoundary from './ErrorBoundary';

const ChildComponent = () => {
  // 模拟错误
  throw new Error('Simulated error!');
  return <div>Child Component</div>;
};

const App = () => {
  return (
    <ErrorBoundary>
      <ChildComponent />
    </ErrorBoundary>
  );
};

export default App;</code>

<code class="javascript">import React, { useState } from 'react';

const ButtonWithError = () => {
  const [hasError, setHasError] = useState(false);

  const handleClick = () => {
    try {
      // 模拟错误
      throw new Error('Something went wrong!');
    } catch (error) {
      setHasError(true);
      console.error(error);
    }
  };

  if (hasError) {
    return <h1>There was an error with the button action!</h1>;
  }

  return <button onClick={handleClick}>Click Me</button>;
};

export default ButtonWithError;</code>