使用 koa-bodyparser 中间件解析POST请求参数

app.js

const koa = require("koa");
const app = new koa();
const bodyParser = require("koa-bodyparser");
app.use(bodyParser());

app.use(async ctx => {
  if (ctx.url === "/" && ctx.method === "GET") {
    ctx.type = "html";
    let html = `
    <h1>登录</h1>
    <form action="/" method="post">
      <p>用户名</p>
      <input type="text" name="username" /><br>
      <p>密码</p>
      <input type="text" name="password" /><br>
      <button type="submit">submit</button>
    </form>
    `;
    ctx.body = html;
  } else if (ctx.url === "/" && ctx.method === "POST") {
    let postData = ctx.request.body;
    ctx.body = postData;
  }
});
app.listen(3000, () => {
  console.log("server is running at http://localhost:3000");
});