什么Express websocket事件存在？

Question

我想知道什么是websocket事件到目前为止我只使用了这个ws.on('message')事件,但是我想使用在建立和关闭连接时触发的事件.我尝试添加ws.on('connection'),但没有被触发.

我的代码:

app.ws('/', function (ws, req) {
    ws.on('message', function (textChunk) {
            //do stuff
        }
    });
});

我需要一些客户端编程来执行此操作吗？

我尝试添加它,但是当我从客户端连接时它没有触发.

ws.on('request', function () {
  console.log("request");
});

Answer 1

提供的功能app.ws是在打开新的websocket时执行的功能.所以以这种方式使用它:

app.ws('/', function (ws, req) {

    console.log("New connection has opened!");

    ws.on('close', function() {
        console.log('The connection was closed!');
    });

    ws.on('message', function (message) {
        console.log('Message received: '+message);
    });
});

Answer 2

查看源代码后,express-ws您可以执行以下操作.

var express = require('express');
var app = express();
var expressWs = require('express-ws')(app);

// get the WebsocketServer instance with getWss()
// https://github.com/HenningM/express-ws/blob/5b5cf93bb378a0e6dbe6ab33313bb442b0c25868/index.js#L72-L74
expressWs.getWss().on('connection', function(ws) {
  console.log('connection open');
});

// ... express middleware

// ... websocket middle ware
app.ws('/', function(ws, req) {
  ws.on('message', function(msg) {
    console.log(msg);
  });
});

app.listen(3000);

旧的回应

有以下内容:

close
error
message
open

https://developer.mozilla.org/en-US/docs/Web/API/WebSocket#Attributes