Module 02 · Asynchronous I/O with callback programming异步 I/O 与回调编程
Hands-on Lab - Async Callback Programming动手实验：异步回调编程
Objective for Exercise: By the end of this lab, you will be able to understand asynchronous callbacks and be able to write the code in a Node.js application.
目标：锻炼 到这个实验室结束时，你将能够理解异步回调，并能够在 Node.js 应用程序中编写代码。
Prerequisites Before you start, be sure that you meet these prerequisites:
先决条件 在开始之前，请确保您满足以下先决条件：
- Basic knowledge of JavaScript.