laf/docs/guide/function/websocket.md

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---
title: 云函数处理 WebSocket 长连接
---
# {{ $frontmatter.title }}
## 特殊函数名 __websocket__
如果需要使用 WebSocket 需要创建一个云函数并且命名为 `__websocket__`,这个云函数并不会运行之后销毁,会一直存在,专为 WebSocket 存在的云函数!
以下是云函数中处理 WebSocket 示例:
```ts
export async function main(ctx: FunctionContext) {
if (ctx.method === "WebSocket:connection") {
ctx.socket.send('hi connection succeed')
}
if (ctx.method === 'WebSocket:message') {
const { data } = ctx.params;
console.log(data.toString());
ctx.socket.send("I have received your message");
}
}
```
更多用法请参考: https://github.com/websockets/ws
## 客户端 WebSocket 连接
```ts
const wss = new WebSocket("wss://your-own-appid.laf.run/__websocket__");
wss.onopen = (socket) => {
console.log("connected");
wss.send("hi");
};
wss.onmessage = (res) => {
console.log("收到了新的信息......");
console.log(res.data);
};
wss.onclose = () => {
console.log("closed");
};
```