counter 示例源码

这些文件来自仓库的 examples/counter，可结合对应中文文档阅读和运行。

wrangler.jsonc

{
  "name": "counter",
  "main": "index.js",
  "compatibility_date": "2026-01-01",
  "durable_objects": {
    "bindings": [{ "name": "COUNTER", "class_name": "Counter" }]
  },
  "migrations": [{ "tag": "v1", "new_sqlite_classes": ["Counter"] }]
}

index.js

export class Counter {
  constructor(state, env) {
    this.state = state;
  }
  async fetch(request) {
    let n = (await this.state.storage.get("n")) ?? 0;
    n++;
    await this.state.storage.put("n", n);
    return Response.json({ n, url: request.url });
  }
}
export default {
  async fetch(request, env) {
    const name = new URL(request.url).searchParams.get("name") ?? "default";
    const id = env.COUNTER.idFromName(name);
    return env.COUNTER.get(id).fetch(request);
  },
};