我是 React 新手，当我尝试从 React 应用程序的一个名为“products.js”的文件中的对象数组中获取一些“产品”时，我需要一些帮助。

问题是 我能够 在主屏幕的数组中绘制产品。但是，当我尝试在我的详细产品页面（这是一个我可以查看单个产品详细信息的页面）“ProductDetails.js”上绘制这些产品时，我收到了错误（无论我尝试获取 product.name 还是 product.price 或其他内容）：

TypeError: Cannot read properties of undefined (reading 'name')

为了让您了解我在说什么，我将与您分享我的代码中的一些片段，以便让您了解上下文。我将从确切的错误消息开始，并以我的项目依赖项的概览结束。

错误消息

TypeError: Cannot read properties of undefined (reading 'name')
ProductDetails
C:/Users/jjimennz/OneDrive/Desktop/eCommerce MERN Stack/Sprint1/frontend/src/views/ProductDetails.js:19

 16 | const ProductDetails = ({ match }) => {
  17 |   const product = products.find((p) => p._id === match.params.id);
  18 | 
> 19 |   return <div>{product.name}</div>;
  20 | };
  21 | 
  22 | export default ProductDetails;

这是我遇到麻烦的视图，不仅是“product.name”，我还遇到过“product.price”，“product.image”等问题……这是详细信息产品屏幕，该视图应该在自己的页面上显示每个单独的产品及其详细信息，我称之为“ProductDetails.js”

import React from "react";
import products from "../products";

const ProductDetails = ({ match }) => {
  const product = products.find((p) => p._id === match.params.id);

  return <div>{product.name}</div>;
};

export default ProductDetails;

这是包含我想在上面的产品详细信息屏幕上绘制的产品的数组文件。此文件名为“products.js”：

const products = [
  {
    _id: 1,
    name: "Nemeziz 19.4",
    image:
      "https://assets.adidas.com/images/w_600,f_auto,q_auto/75987ad2e31644d59d24ab3000fce766_9366/Botines_Nemeziz_19.4_Pasto_Sintetico_Verde_FV3317_41_detail.jpg",
    description: "Breve descripcion de los zapatos",
    brand: "Adidas",
    category: "Zapatos",
    price: 89.99,
    countInStock: 20,
    rating: 4.5,
    numReviews: 14,
  },
  {
    _id: 2,
    name: "Adidas Ace",
    image: "https://www.sports-ws.com/img/item/F163AD0/F163AD0654.jpg",
    description: "Breve descripcion de los zapatos",
    brand: "Adidas",
    category: "Zapatos",
    price: 149.99,
    countInStock: 8,
    rating: 4.5,
    numReviews: 15,
  },
];

export default products

这是主屏幕的视图，我在上面显示数组中的所有产品，这个视图工作正常，并在屏幕上绘制数组中的每个产品。这个文件名为“HomeScreen.js”

import React from "react";
import { Row, Col } from "react-bootstrap";
import Product from "../components/Product";
import products from "../products";

const HomeScreen = () => {
  return (
    <>
      <h1>Latest Products</h1>
      <Row>
        {products.map((product) => (
          <Col key={product._id} sm={12} md={6} lg={4} xl={3}>
            <Product product={product} />
          </Col>
        ))}
      </Row>
    </>
  );
};

export default HomeScreen;

这是产品组件，它基本上在上面的主屏幕视图上绘制数组中的每个产品。这个作为上面的主屏幕也工作正常，它为我提供了产品的名称、价格和图像。我确实将此组件称为“Product.js” *

import React from "react";
import { Link } from "react-router-dom";
import { Card } from "react-bootstrap";
import Rating from "./Rating";

const Product = ({ product }) => {
  return (
    <Card className="my-3 p-3 rounded">
      <Link to={`/product/${product._id}`}>
        <Card.Img src={product.image} variant="top" />
      </Link>
      <Card.Body>
        <Link to={`/product/${product._id}`}>
          <Card.Title as="div">
            <strong>{product.name}</strong>
          </Card.Title>
        </Link>

        <Card.Text as="div">
          <Rating
            value={product.rating}
            text={`${product.numReviews} reviews`}
          />
        </Card.Text>
        <Card.Text as="h3">${product.price}</Card.Text>
      </Card.Body>
    </Card>
  );
};

export default Product;

“App.js”文件，因此您可以更好地了解我的项目中发生了什么

import React from "react";
import { BrowserRouter as Router, Route } from "react-router-dom";
import { Container } from "react-bootstrap";
import Header from "./components/Header";
import Footer from "./components/Footer";
import HomeScreen from "./views/HomeScreen";
import ProductDetails from "./views/ProductDetails";

function App() {
  return (
    <Router>
      <Header />
      <main className="py-3">
        <Container>
          <Route path="/" component={HomeScreen} exact />
          <Route path="/product/:id" component={ProductDetails} />
        </Container>
      </main>
      <Footer />
    </Router>
  );
}

export default App;

这是我的“package.json”文件，其中包含项目中的依赖项，以防万一它有助于帮助我解决这个问题

{
  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.14.1",
    "@testing-library/react": "^11.2.7",
    "@testing-library/user-event": "^12.8.3",
    "react": "^17.0.2",
    "react-bootstrap": "^2.0.0",
    "react-dom": "^17.0.2",
    "react-router-bootstrap": "^0.25.0",
    "react-router-dom": "^5.3.0",
    "react-scripts": "4.0.3",
    "web-vitals": "^1.1.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

这里有产品详细信息视图上错误消息的屏幕截图

这里有页面的屏幕截图适用于主屏幕