js 取后 台值

// 发送GET请求获取后台数据
fetch('https://api.example.com/data', {
    method: 'GET',
    headers: {
        'Content-Type': 'application/json'
    }
})
.then(response => {
    if (!response.ok) {
        throw new Error('Network response was not ok');
    }
    return response.json();
})
.then(data => {
    console.log('Success:', data);
})
.catch(error => {
    console.error('There was a problem with the fetch operation:', error);
});

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

app.use((req, res, next) => {
    res.header('Access-Control-Allow-Origin', '*'); // 允许所有源访问
    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
    next();
});

// 其他路由和中间件