js读取网页json数据

// 假设我们要获取的 JSON 数据位于 'data.json' 文件中
fetch('data.json')
  .then(response => {
    // 检查请求是否成功
    if (!response.ok) {
      throw new Error('Network response was not ok');
    }
    // 解析响应体为 JSON
    return response.json();
  })
  .then(data => {
    // 在这里处理 JSON 数据
    console.log(data);
  })
  .catch(error => {
    // 处理可能出现的错误
    console.error('There has been a problem with your fetch operation:', error);
  });

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

app.get('/data', (req, res) => {
  res.header('Access-Control-Allow-Origin', '*'); // 允许所有域
  res.json({ message: 'This is data from the server.' });
});

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

function handleResponse(data) {
  console.log(data);
}

const script = document.createElement('script');
script.src = 'http://example.com/data?callback=handleResponse';
document.body.appendChild(script);

app.get('/data', (req, res) => {
  const callback = req.query.callback;
  const data = { message: 'This is data from the server.' };
  res.send(`${callback}(${JSON.stringify(data)})`);
});