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Python 零基础100天—Day70 前后端交互

  • 2026-08-18 23:11:43
Python 零基础100天—Day70 前后端交互

前后端交互 — 全栈闭环

🕐 预计用时:2-3 小时 | 🎯 目标:用 fetch 调用 Django API,实现前后端数据交互


📖 今日目录

  1. 前后端分离架构
  2. JSON API 回顾
  3. fetch GET 请求
  4. fetch POST 请求
  5. fetch PUT/DELETE
  6. 加载状态与错误处理
  7. 认证与 Token
  8. 实战:商品列表页
  9. 今日练习
  10. 今日小结

1. 前后端分离架构

# 传统模式(Django 模板渲染):
# 浏览器 → Django(路由+视图+模板)→ 完整 HTML → 浏览器
# 每次操作都刷新整个页面

# 前后端分离模式:
# 前端:HTML/CSS/JS(独立运行,可能在另一台服务器)
# 后端:Django REST API(只返回 JSON 数据)
# 浏览器 → 前端页面 → fetch 请求 API → JSON 数据 → JS 动态更新页面
# 不刷新页面,体验更好
特性
模板渲染
前后端分离
页面刷新
每次请求刷新
无刷新(SPA)
前后端耦合
强耦合(同一项目)
完全解耦
前端技术
Django Template
React/Vue/原生 JS
后端职责
路由 + 模板 + API
只提供 API
适合场景
传统网站、后台管理
移动端、SPA、多端共享

2. JSON API 回顾

# 后端(Django REST Framework)
# GET    /api/posts/       → 文章列表 JSON
# POST   /api/posts/       → 创建文章
# GET    /api/posts/1/     → 文章详情 JSON
# PUT    /api/posts/1/     → 更新文章
# DELETE /api/posts/1/     → 删除文章

# 响应格式示例
{
    "count": 42,
    "next": "http://example.com/api/posts/?page=2",
    "previous": null,
    "results": [
        {
            "id": 1,
            "title": "Python 学习笔记",
            "content": "...",
            "author_name": "Alice",
            "created_at": "2026-05-12T13:00:00Z"
        }
    ]
}

3. fetch GET 请求

// 基础 GET 请求
fetch('/api/posts/')
    .then(response => {
        if (!response.ok) {
            throw new Error(`HTTP ${response.status}`);
        }
        return response.json();
    })
    .then(data => {
        console.log(data.results);  // 文章数组
    })
    .catch(error => {
        console.error('请求失败:', error);
    });

// async/await 写法(推荐)
async function loadPosts() {
    try {
        let response = await fetch('/api/posts/');
        if (!response.ok) throw new Error(`HTTP ${response.status}`);
        let data = await response.json();
        return data.results;
    } catch (error) {
        console.error('加载失败:', error);
        return [];
    }
}

// 带查询参数
async function searchPosts(keyword) {
    let response = await fetch(`/api/posts/?search=${encodeURIComponent(keyword)}`);
    let data = await response.json();
    return data.results;
}

// 带分页
async function loadPage(page) {
    let response = await fetch(`/api/posts/?page=${page}`);
    let data = await response.json();
    return data;
}

4. fetch POST 请求

// 创建文章
async function createPost(title, content) {
    let response = await fetch('/api/posts/', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'X-CSRFToken': getCookie('csrftoken'),  // Django CSRF
        },
        body: JSON.stringify({
            title: title,
            content: content,
        }),
    });

    if (response.status === 201) {
        let data = await response.json();
        console.log('创建成功:', data);
        return data;
    } else {
        let errors = await response.json();
        console.error('创建失败:', errors);
        return null;
    }
}

// 获取 CSRF Token(Django 需要)
function getCookie(name) {
    let value = document.cookie.match('(^|;)\\s*' + name + '\\s*=\\s*([^;]+)');
    return value ? value.pop() : '';
}

💡 Django CSRF 处理:

Django 的 POST 请求默认需要 CSRF token。两种解决方案:

1. 前后端同域:从 Cookie 读取 csrftoken,放在请求头 X-CSRFToken
2. 前后端跨域:用 Token 认证(DRF 的 TokenAuthentication),不需要 CSRF


5. fetch PUT/DELETE

// 更新文章
async function updatePost(id, data) {
    let response = await fetch(`/api/posts/${id}/`, {
        method: 'PUT',
        headers: {
            'Content-Type': 'application/json',
            'X-CSRFToken': getCookie('csrftoken'),
        },
        body: JSON.stringify(data),
    });
    return await response.json();
}

// 删除文章
async function deletePost(id) {
    let response = await fetch(`/api/posts/${id}/`, {
        method: 'DELETE',
        headers: {
            'X-CSRFToken': getCookie('csrftoken'),
        },
    });
    return response.status === 204;  // 204 = 删除成功,无返回体
}

6. 加载状态与错误处理

// 完整的加载流程
async function loadPosts() {
    let container = document.querySelector('
#posts');

    // 1. 显示加载中
    container.innerHTML = '<div class="loading">加载中...</div>';

    try {
        // 2. 发起请求
        let response = await fetch('/api/posts/');

        // 3. 检查状态码
        if (response.status === 404) {
            container.innerHTML = '<p>暂无文章</p>';
            return;
        }
        if (response.status === 403) {
            container.innerHTML = '<p>请先登录</p>';
            return;
        }
        if (!response.ok) {
            throw new Error(`服务器错误:${response.status}`);
        }

        // 4. 解析 JSON
        let data = await response.json();

        // 5. 渲染数据
        if (data.results.length === 0) {
            container.innerHTML = '<p>暂无文章</p>';
            return;
        }

        container.innerHTML = data.results.map(post => `
            <div class="post-card">
                <h3><a href="/posts/${post.id}/">${post.title}</a></h3>
                <p>${post.author_name} · ${new Date(post.created_at).toLocaleDateString()}</p>
            </div>
        `).join('');

    } catch (error) {
        // 6. 错误处理
        container.innerHTML = `
            <div class="error">
                <p>⚠️ 加载失败:${error.message}</p>
                <button onclick="loadPosts()">重试</button>
            </div>
        `;
    }
}
// 封装通用的 API 请求函数
async function apiRequest(url, options = {}) {
    const defaults = {
        headers: {
            'Content-Type': 'application/json',
            'X-CSRFToken': getCookie('csrftoken'),
        },
    };

    const config = {
        ...defaults,
        ...options,
        headers: { ...defaults.headers, ...options.headers },
    };

    try {
        let response = await fetch(url, config);

        if (response.status === 401) {
            window.location.href = '/login/';
            return null;
        }

        if (!response.ok) {
            let error = await response.json().catch(() => ({}));
            throw new Error(error.detail || `请求失败:${response.status}`);
        }

        if (response.status === 204) return true;  // DELETE 成功

        return await response.json();
    } catch (error) {
        showToast(error.message, 'error');
        throw error;
    }
}

// 使用
let posts = await apiRequest('/api/posts/');
await apiRequest('/api/posts/', {
    method: 'POST',
    body: JSON.stringify({ title: 'Hello', content: '...' }),
});
await apiRequest('/api/posts/1/', { method: 'DELETE' });

7. 认证与 Token

// Token 认证流程
// 1. 用户登录 → 后端返回 Token
// 2. 前端存储 Token(localStorage 或 Cookie)
// 3. 后续请求带 Token

// 登录获取 Token
async function login(username, password) {
    let response = await fetch('/api-token-auth/', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ username, password }),
    });

    if (response.ok) {
        let data = await response.json();
        localStorage.setItem('token', data.token);  // 存储 Token
        return data.token;
    }
    return null;
}

// 带 Token 的请求
async function authFetch(url, options = {}) {
    let token = localStorage.getItem('token');
    return fetch(url, {
        ...options,
        headers: {
            'Content-Type': 'application/json',
            'Authorization': `Token ${token}`,
            ...options.headers,
        },
    });
}

// 使用
let data = await authFetch('/api/posts/').then(r => r.json());

8. 实战:商品列表页

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>商品列表</title>
    <style>
        .products { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
        .card { border: 1px solid #eee; border-radius: 8px; padding: 16px; }
        .card img { width: 100%; border-radius: 4px; }
        .price { color: #e74c3c; font-size: 20px; font-weight: bold; }
        .loading { text-align: center; padding: 40px; color: #888; }
        .error { text-align: center; padding: 40px; color: red; }
        .search-bar { margin: 20px 0; }
        .search-bar input { padding: 10px; width: 300px; }
        .search-bar button { padding: 10px 20px; }
        .pagination { margin: 20px 0; text-align: center; }
        .pagination button { margin: 0 5px; padding: 8px 16px; }
    </style>
</head>
<body>
    <h1>🛒 商品列表</h1>

    <div class="search-bar">
        <input type="text" id="searchInput" placeholder="搜索商品...">
        <button onclick="search()">搜索</button>
    </div>

    <div id="products" class="products">
        <div class="loading">加载中...</div>
    </div>

    <div id="pagination" class="pagination"></div>

    <script>
        let currentPage = 1;

        async function loadProducts(page = 1, search = '') {
            let container = document.querySelector('#products');
            container.innerHTML = '<div class="loading">加载中...</div>';

            try {
                let url = `/api/products/?page=${page}`;
                if (search) url += `&search=${encodeURIComponent(search)}`;

                let response = await fetch(url);
                let data = await response.json();

                if (data.results.length === 0) {
                    container.innerHTML = '<p>暂无商品</p>';
                    return;
                }

                container.innerHTML = data.results.map(product => `
                    <div class="card">
                        <img src="${product.image || '/static/images/default.png'}" alt="${product.name}">
                        <h3>${product.name}</h3>
                        <p class="price">¥${product.price}</p>
                        <p>已售 ${product.sales}</p>
                        <button onclick="addToCart(${product.id})">加入购物车</button>
                    </div>
                `).join('');

                // 分页
                renderPagination(data.count, page);
                currentPage = page;

            } catch (error) {
                container.innerHTML = `
                    <div class="error">
                        ⚠️ 加载失败
                        <button onclick="loadProducts(${page})">重试</button>
                    </div>
                `;
            }
        }

        function renderPagination(total, current) {
            let pages = Math.ceil(total / 12);
            let html = '';
            if (current > 1) html += `<button onclick="loadProducts(${current-1})">上一页</button>`;
            for (let i = 1; i <= pages; i++) {
                html += `<button onclick="loadProducts(${i})" ${i === current ? 'disabled' : ''}>${i}</button>`;
            }
            if (current < pages) html += `<button onclick="loadProducts(${current+1})">下一页</button>`;
            document.querySelector('#pagination').innerHTML = html;
        }

        function search() {
            let keyword = document.querySelector('#searchInput').value;
            loadProducts(1, keyword);
        }

        async function addToCart(productId) {
            let response = await fetch(`/api/cart/add/`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'X-CSRFToken': getCookie('csrftoken'),
                },
                body: JSON.stringify({ product_id: productId, quantity: 1 }),
            });
            if (response.ok) {
                alert('已加入购物车!');
            } else {
                alert('添加失败');
            }
        }

        function getCookie(name) {
            let v = document.cookie.match('(^|;)\\s*' + name + '\\s*=\\s*([^;]+)');
            return v ? v.pop() : '';
        }

        // 页面加载完成后执行
        document.addEventListener('DOMContentLoaded', () => loadProducts());
    </script>
</body>
</html>

9. 今日练习

🏋️ 练习 1:文章 CRUD 前端

# 创建一个完整的文章管理页面:
# - 文章列表(fetch 加载)
# - 创建文章(表单 + fetch POST)
# - 编辑文章(表单预填充 + fetch PUT)
# - 删除文章(确认 + fetch DELETE)
# - 每个操作都有加载状态和错误提示

🏋️ 练习 2:购物车页面

# 用 JS 实现购物车页面:
# - 从 Session API 加载购物车数据
# - 修改数量(实时更新)
# - 删除商品
# - 实时计算总价
# - 结算按钮

🏋️ 练习 3:搜索与筛选

# 实现实时搜索:
# - 输入框输入时实时搜索(防抖 debounce 300ms)
# - 分类下拉筛选
# - 排序选择
# - 搜索结果高亮关键词

10. 今日小结

知识点
核心内容
前后端分离
前端只渲染 UI,后端只提供 JSON API
fetch GET
fetch(url).then(r => r.json())
fetch POST
fetch(url, {method:'POST', body:JSON.stringify(data)})
CSRF
从 Cookie 读 csrftoken,放在 X-CSRFToken 头
Token 认证
登录获取 Token → localStorage 存储 → 请求带 Authorization 头
加载状态
加载中 → 数据渲染 → 错误处理 → 重试
API 封装
统一的 apiRequest 函数,处理认证、错误、重试

🎉 前端基础阶段完结!

Day 67-70 你掌握了前端三件套:
✅ HTML(骨架)· CSS(样式)· JavaScript(交互)
✅ 前后端分离 · fetch API · Token 认证

接下来进入数据科学阶段(Day 71-78)—— NumPy、Pandas、Matplotlib。Python 在数据分析领域的威力即将展现!

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  1. CONNECT:[ UseTime:0.001067s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001540s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000582s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000494s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001054s ]
  6. SELECT * FROM `set` [ RunTime:0.000781s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001243s ]
  8. SELECT * FROM `article` WHERE `id` = 508859 LIMIT 1 [ RunTime:0.001045s ]
  9. UPDATE `article` SET `lasttime` = 1787337269 WHERE `id` = 508859 [ RunTime:0.038410s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.006947s ]
  11. SELECT * FROM `article` WHERE `id` < 508859 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001310s ]
  12. SELECT * FROM `article` WHERE `id` > 508859 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001053s ]
  13. SELECT * FROM `article` WHERE `id` < 508859 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001995s ]
  14. SELECT * FROM `article` WHERE `id` < 508859 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002161s ]
  15. SELECT * FROM `article` WHERE `id` < 508859 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001896s ]
0.227087s