跨域请求

const express = require("express");
const app = express();
const port = 3000;
app.get("/", (req, res) => {
  // 允许跨域请求
  res.setHeader("Access-Control-Allow-Origin", "*");
  const json = { name: "沐颖汐", age: 18 };
  res.send(JSON.stringify(json));
});
app.listen(port, () => {
  console.log(`Example 运行在 ${port} 端口上`);
});