JS分页查询代码

async function fetchData(currentPage = 1, pageSize = 10) {
    try {
        const response = await fetch(`/api/data?currentPage=${currentPage}&pageSize=${pageSize}`);
        const data = await response.json();
        return data;
    } catch (error) {
        console.error('Error fetching data:', error);
        return [];
    }
}

// 使用示例
fetchData(1, 10).then(data => {
    console.log('Fetched data:', data);
    // 在这里处理数据，如渲染到页面上
});

const express = require('express');
const app = express();

// 假设我们有一个大数据集
const largeDataSet = [...]; // ...填充大量数据

app.get('/api/data', (req, res) => {
    const currentPage = parseInt(req.query.currentPage) || 1;
    const pageSize = parseInt(req.query.pageSize) || 10;

    const startIndex = (currentPage - 1) * pageSize;
    const endIndex = startIndex + pageSize;

    const paginatedData = largeDataSet.slice(startIndex, endIndex);

    res.json(paginatedData);
});

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