jsx呈现循环错误:未定义元素

const items = []; // 确保数组已定义且不为空

return (
  <div>
    {items.map((item, index) => (
      <div key={index}>{item}</div>
    ))}
  </div>
);

const data = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 }
]; // 确保对象属性已定义

return (
  <div>
    {data.map((person, index) => (
      <div key={index}>
        <p>{person.name}</p>
        <p>{person.age}</p>
      </div>
    ))}
  </div>
);

const items = []; // 确保数组已定义且不为空

return (
  <div>
    {items.map((item, index) => (
      <div key={index}>{item || '默认值'}</div>
    ))}
  </div>
);

import React from 'react';

const ProductList = ({ products }) => {
  return (
    <div>
      {products.map((product, index) => (
        <div key={index}>
          <h3>{product.name}</h3>
          <p>{product.description}</p>
          <p>Price: ${product.price}</p>
        </div>
      ))}
    </div>
  );
};

export default ProductList;