Node.js 无服务器简介
了解无服务器计算及其优势，以及如何在 AWS Lambda 等平台上部署 Node.js 函数
Node.js 无服务器简介 是 CoddyKit 上的免费 Node.js Backend Development Bootcamp 课时。 这是第 1 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Node.js Backend Development Bootcamp 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Node.js Backend Development Bootcamp 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
What is Serverless Computing?
Welcome to the world of Serverless Computing! This isn't about running code without servers; it's about not managing them yourself.
In a serverless architecture, a cloud provider (like AWS, Azure, or Google Cloud) handles all the server management, scaling, and infrastructure for you. You just focus on writing your code.
Function as a Service (FaaS)
The core of serverless is often Function as a Service (FaaS). You deploy individual functions, not entire applications.
- Event-Driven: Functions run only when triggered by an event (e.g., an HTTP request, a file upload, a database change).
- Stateless: Each execution is independent; functions don't maintain state between invocations.
- Ephemeral: Functions only exist while they are executing, then they shut down.
Why Go Serverless? Key Benefits
Serverless offers compelling advantages for many applications:
- Reduced Operational Overhead: No servers to provision, patch, or scale.
- Automatic Scalability: Your functions automatically scale up or down based on demand.
- Cost Efficiency: You only pay for the compute time your code actually runs, often measured in milliseconds.
- Faster Development: Focus on business logic, not infrastructure.
Node.js: A Perfect Serverless Fit
Node.js is incredibly popular for serverless functions, and for good reason!
Its event-driven, non-blocking I/O model aligns perfectly with the ephemeral, event-driven nature of serverless functions. Node.js functions also tend to have very fast 'cold start' times, meaning they're ready to execute quickly.
Introducing AWS Lambda
AWS Lambda is Amazon Web Services' leading FaaS offering and one of the most widely used serverless platforms.
Lambda allows you to run code without provisioning or managing servers. You upload your code, and Lambda takes care of everything required to run and scale it with high availability.
Anatomy of a Lambda Function
A Node.js Lambda function typically exports a single handler function. This function receives two main arguments:
event: An object containing data about the trigger event.context: An object providing runtime information about the invocation, function, and execution environment.
The function can be async or return a Promise for asynchronous operations.
Your First Lambda Function
Let's look at a simple "Hello World" Lambda function in Node.js. This function responds with a greeting.
Notice the statusCode and body which are common for HTTP responses via Lambda.
exports.handler = async (event) => {
const response = {
statusCode: 200,
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ message: 'Hello from CoddyKit Lambda!' }),
};
return response;
};Understanding the Event Object
The event object is crucial as it contains all the input data for your function. Its structure varies based on the trigger.
If triggered by an API Gateway, it might include:
httpMethod(e.g., 'GET', 'POST')path(e.g., '/hello')queryStringParametersbody(for POST requests)
Common Lambda Triggers
Lambda functions can be invoked by a wide array of AWS services. Here are some common triggers:
- API Gateway: For building RESTful APIs.
- S3 (Simple Storage Service): When objects are created or deleted in a bucket.
- DynamoDB Streams: When items in a DynamoDB table are modified.
- SNS (Simple Notification Service): For notifications and fan-out messaging.
- CloudWatch Events/EventBridge: For scheduled tasks or reacting to AWS service events.
Serverless Concept Check
Test your understanding of serverless computing!
Recap: Intro to Serverless
Great job! You've taken your first steps into serverless computing.
- We defined serverless as focusing on code, not server management.
- Learned about FaaS (Function as a Service) as its core concept.
- Explored benefits like cost efficiency and automatic scalability.
- Understood why Node.js is a great fit for serverless.
- Got an introduction to AWS Lambda and its basic function structure.
Next, we'll dive into GraphQL API design principles!
常见问题解答
「Node.js 无服务器简介」课时是免费的吗？
是的 — 「Node.js 无服务器简介」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Node.js Backend Development Bootcamp 课程的其余内容，请升级到 CoddyKit PRO。 Node.js Backend Development Bootcamp 课程共包含 4 节课。
「Node.js 无服务器简介」这节课中我会学到什么？
了解无服务器计算及其优势，以及如何在 AWS Lambda 等平台上部署 Node.js 函数 你通过在浏览器中直接运行的动手代码来练习 Node.js Backend Development Bootcamp，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Node.js Backend Development Bootcamp 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Node.js Backend Development Bootcamp 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 1 节课，共 4 节。
「Node.js 无服务器简介」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Node.js Backend Development Bootcamp 课中编写并运行代码吗？
能。每节 Node.js Backend Development Bootcamp 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。