js调用支付宝api接口

function payWithAlipay() {
    // 构造请求参数
    const params = {
        out_trade_no: '123456789', // 商户订单号
        total_amount: '0.01',       // 订单总金额
        subject: 'Test Payment',     // 订单标题
        product_code: 'QUICK_WAP_WAY' // 销售产品码
    };

    // 发送请求到后端服务器
    fetch('/api/create_order', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify(params)
    })
    .then(response => response.json())
    .then(data => {
        if (data.code === 0) {
            // 跳转到支付宝支付页面
            window.location.href = data.pay_url;
        } else {
            alert('创建订单失败，请重试');
        }
    })
    .catch(error => {
        console.error('Error:', error);
    });
}

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

app.use(express.json());

app.post('/api/create_order', async (req, res) => {
    const { out_trade_no, total_amount, subject, product_code } = req.body;

    try {
        // 调用支付宝接口创建订单
        const response = await axios.post('https://openapi.alipay.com/gateway.do', {
            app_id: 'your_app_id',
            method: 'alipay.trade.wap.pay',
            charset: 'utf-8',
            sign_type: 'RSA2',
            timestamp: new Date().toISOString(),
            version: '1.0',
            notify_url: 'https://yourdomain.com/api/notify',
            return_url: 'https://yourdomain.com/pay/success',
            biz_content: JSON.stringify({
                out_trade_no,
                total_amount,
                subject,
                product_code
            })
        }, {
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded'
            }
        });

        // 返回支付页面URL给前端
        res.json({ code: 0, pay_url: response.data.alipay_trade_wap_pay_response.pay_url });
    } catch (error) {
        console.error('Error:', error);
        res.status(500).json({ code: -1, message: '创建订单失败' });
    }
});

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