如何编写一个 Cloudflare Worker

使用 Wrangler CLI 工具来编写和部署 Cloudflare Worker 是非常轻松的一件事。

当然这里有更详细的官方文档，如果你想了解更多，可以访问 Cloudflare Worker 文档

大致流程

1. 安装 Wrangler CLI
2. 创建一个 Worker
3. 编写你的 worker 代码
4. 测试你的 worker 代码
5. 推送和部署你的 worker 代码

安装 Wrangler CLI

npm

npm install -g @cloudflare/wrangler

yarn

yarn global add @cloudflare/wrangler

pnpm

pnpm add -g @cloudflare/wrangler

创建一个 Worker

wrangler generate [(必)你的项目名称] [(选)模板仓库地址]

例如：

wrangler generate my-worker https://github.com/cloudflare/worker-template
cd my-worker

注意

示例输出

当你看到以下类似的示例输出时，说明你已经成功创建了一个 Worker 项目

> wrangler generate my-worker

 ⛅️ wrangler 3.94.0
-------------------

Using npm as package manager.
✨ Created my-worker\wrangler.toml

# 你想使用git来管理这个worker吗？(Y/n)
? Would you like to use git to manage this Worker? » (Y/n)
✨ Initialized git repository at my-worker

# 没有找到package.json文件，你想创建一个吗？(Y/n)
? No package.json found. Would you like to create one? » (Y/n)
✨ Created my-worker\package.json

# 你想使用TypeScript吗？(Y/n)
? Would you like to use TypeScript? » (Y/n)

# 你想让我们创建一个示例文件吗？(Y/n)
? Would you like to create a Worker at my-worker\src\index.ts? » - Use arrow-keys. Return to submit.
    None
>   Fetch handler
    Scheduled handler
✨ Created my-worker\src\index.js

# 你想让我们创建第一个测试文件吗？(Y/n)
? Would you like us to write your first test? » (Y/n)
# 你想使用哪个测试框架？(Choose one)
? Which test runner would you like to use? » - Use arrow-keys. Return to submit.
    Vitest
>   Jest
✨ Installed jest into devDependencies

To start developing your Worker, run `cd my-worker && npm start`
To start testing your Worker, run `npm test`
To publish your Worker to the Internet, run `npm run deploy`

Write your worker code

Open src/index.js and start writing your worker code.

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
  const url = new URL(request.url)
  const path = url.pathname

  if (path === '/') {
    return new Response('Hello, world!', {