自定义域名与环境
使用您自己的名称和安全设置
自定义域名与环境 是 CoddyKit 上的免费 Vibe Coding 课时。 这是第 3 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 Vibe Coding 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Vibe Coding 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。
Make It Yours
Your app is live at my-app.vercel.app — great start! But to look professional, you want your own name, like myapp.com.
You also need a safe place to store secret settings (like API keys) without putting them in your code. That's what environments are for.
This lesson covers both: custom domains and environment variables — two finishing touches that make your app feel real.
What Is a Domain?
A domain is the human-friendly name people type to reach your app, like google.com or myapp.com.
The free .vercel.app or .netlify.app address works perfectly — but a custom domain:
- Looks more trustworthy and professional.
- Is easier to remember and share.
- Makes your project feel like a real product.
You buy a domain once (often $10–15/year) from a registrar like Namecheap, GoDaddy, or directly through Vercel.
Connecting Your Domain
Once you own a domain, connecting it is just a few clicks:
- In Vercel or Netlify, open your project's Domains settings.
- Type your domain (e.g.
myapp.com) and add it. - The host shows you DNS records to set at your registrar.
- Save those records, wait a few minutes, and your domain goes live.
If buying through Vercel itself, this is even simpler — it's all connected automatically.
DNS Without the Headache
DNS (Domain Name System) is like the internet's phone book — it maps your domain name to your app's host. It can look intimidating, but you rarely touch it directly.
The host tells you exactly which records to add. If anything looks confusing, paste it to AI and let it translate the steps into plain actions.
I bought myapp.com on Namecheap and deployed my app on Vercel.
Vercel told me to add these DNS records:
Type: A Name: @ Value: 76.76.21.21
Type: CNAME Name: www Value: cname.vercel-dns.com
Explain in beginner terms what these records do, and give me click-by-click steps to add them in Namecheap.HTTPS Comes Free
You may have noticed the padlock icon in your browser's address bar. That's HTTPS — it encrypts traffic so data is safe.
In the past, setting this up was painful. Today, Vercel and Netlify add HTTPS automatically to every domain, including custom ones, for free.
You don't configure anything. Your myapp.com will get the secure padlock on its own. One less thing to worry about.
What Are Environments?
An environment is a context your app runs in, with its own settings. Most apps have two:
- Development: on your laptop, while you build and test.
- Production: the live version real users see.
Why separate them? You might use a test database while building and the real one in production. Keeping them apart means experiments never break the live app.
Environment Variables
An environment variable is a named setting your app reads at runtime — instead of hard-coding a value, you store it outside the code.
Common examples: API keys, database URLs, feature flags. In JavaScript, you read them like this:
// Reading an environment variable in JavaScript
// (process.env holds your environment settings)
const apiUrl = process.env.API_URL || "https://api.example.com";
const isProd = process.env.NODE_ENV === "production";
console.log("Calling API at:", apiUrl);
console.log("Running in production?", isProd);Why Keys Don't Belong in Code
Imagine pasting your secret API key right into your code, then pushing it to GitHub. Now anyone who sees your repo has your key — they could run up huge bills or steal data.
Environment variables solve this. The secret lives in your host's settings, never in the code. Your repo stays safe to share.
- Bad:
const key = "sk-live-abc123..."in your code. - Good:
const key = process.env.API_KEYwith the value stored on the host.
Setting Variables on Your Host
Both Vercel and Netlify have a simple panel for this:
- Open your project's Settings → Environment Variables.
- Add a name (like
API_KEY) and its value. - Choose which environment it applies to (production, preview, development).
- Save — then redeploy so the app picks it up.
Now your code reads process.env.API_KEY and the host fills in the real secret at runtime. Safe and clean.
Let AI Set It All Up
Domains and environment variables are exactly the kind of setup where AI shines. Describe your situation and let it produce a checklist tailored to you.
My app is deployed on Vercel. I want to finish setting it up properly.
Help me with two things, step by step:
1. Connect my custom domain "myapp.com" (I bought it on GoDaddy).
2. Move my OpenAI API key out of my code and into a Vercel environment variable, then read it safely in my JavaScript.
Give me a clear, numbered checklist for a beginner.Keep a .env File Locally
While building on your laptop, you store the same variables in a special file called .env. It sits in your project but is never pushed to GitHub.
A .env file looks like this:
API_KEY=sk-test-12345API_URL=https://api.example.com
Crucially, you add .env to a file called .gitignore so Git skips it. Ask AI: "Add a .env file and make sure Git ignores it." The local file feeds development; the host's panel feeds production.
Quick Check
Domains and secrets — two pro touches. Let's confirm the key idea.
Recap: Polished and Secure
Your app now feels like a real product:
- A custom domain replaces the default link — just add it and set DNS records.
- HTTPS (the secure padlock) is added free and automatically.
- Environments separate development from production.
- Environment variables keep secrets out of your code — set them on the host and in a git-ignored
.envlocally. - AI can generate a tailored setup checklist for all of it.
Next: shipping updates to your live app safely, without breaking things.
常见问题解答
「自定义域名与环境」课时是免费的吗？
是的 — 「自定义域名与环境」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 Vibe Coding 课程的其余内容，请升级到 CoddyKit PRO。 Vibe Coding 课程共包含 4 节课。
「自定义域名与环境」这节课中我会学到什么？
使用您自己的名称和安全设置 你通过在浏览器中直接运行的动手代码来练习 Vibe Coding，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 Vibe Coding 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Vibe Coding 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 3 节课，共 4 节。
「自定义域名与环境」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 Vibe Coding 课中编写并运行代码吗？
能。每节 Vibe Coding 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。