点赞js代码

<button id="likeButton">点赞</button>
<span id="likeCount">0</span>

document.getElementById('likeButton').addEventListener('click', function() {
    // 发送AJAX请求到服务器
    fetch('/api/like', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ postId: 1 }) // 假设点赞的是ID为1的帖子
    })
    .then(response => response.json())
    .then(data => {
        if (data.success) {
            // 更新点赞数
            document.getElementById('likeCount').textContent = data.likeCount;
        } else {
            alert('点赞失败，请重试！');
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('点赞失败，请检查网络连接！');
    });
});

const express = require('express');
const app = express();
app.use(express.json());

let likeCount = 0;

app.post('/api/like', (req, res) => {
    const { postId } = req.body;
    // 这里可以添加验证postId的逻辑
    likeCount += 1;
    res.json({ success: true, likeCount });
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});