koa环境配置

安装并运行

Step 1: Create a new project

To create a new Koa project, open a terminal window and run the following command:

mkdir my-koa-app
cd my-koa-app
npm init -y

Step 2: Install Koa

Next, install Koa as a dependency for your project by running the following command:

npm install koa

Step 3: Create a basic Koa application

Now, create a new file named app.js in the root of your project directory and add the following code:

const Koa = require('koa');
const app = new Koa();
 
app.use(async ctx => {
  ctx.body = 'Hello, Koa!';
});
 
app.listen(3000);
console.log('Server running on http://localhost:3000');

Step 4: Run the application

To start your Koa application, run the following command in the terminal:

node app.js

You should see a message indicating that the server is running on http://localhost:3000. Open your web browser and navigate to this URL to see your Koa application in action.