package.json

{
  "name": "myweb",
  "version": "1.0.0",
  "description": "",
  "main": "",
  "scripts": {
    "start": "ts-node index.ts"
  },
  "author": "nero",
  "license": "ISC",
  "devDependencies": {
    "@types/koa": "^2.11.3",
    "@types/node": "^14.0.12",
    "koa": "^2.12.0",
    "ts-node": "^8.10.2",
    "typescript": "^3.9.5"
  }
}

index.ts

import * as Koa from "koa";

const app = new Koa();

app.use(async ctx => {
    ctx.body = 'Hello World';
});

//設置監聽端口
app.listen(3000, () => {
    console.log("服務器開啟 127.0.0.1:3000");
});

總結

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