socket.emit() 与 socket.send() [英] socket.emit() vs. socket.send()

问题描述

这两者有什么区别?

我注意到如果我在工作程序中从 socket.emit 更改为 socket.send ，服务器无法接收消息，虽然我不明白为什么.

I noticed that if I changed from socket.emit to socket.send in a working program, the server failed to receive the message, although I don't understand why.

我还注意到，在我的程序中，如果我从socket.emit 改为socket.send，服务器会收到一条消息，但它似乎收到了多次.当我使用 console.log() 查看服务器收到的内容时，它显示的内容与我使用 socket.emit 时不同.

I also noticed that in my program if I changed from socket.emit to socket.send, the server receives a message, but it seems to receive it multiple times. When I use console.log() to see what the server received, it shows something different from when I use socket.emit.

为什么会有这种行为?你怎么知道什么时候使用socket.emit 或socket.send?

Why this behavior? How do you know when to use socket.emit or socket.send?

推荐答案

使用 socket.emit 你可以注册这样的自定义事件:

With socket.emit you can register custom event like that:

服务器:

var io = require('socket.io').listen(80);

io.sockets.on('connection', function (socket) {
  socket.emit('news', { hello: 'world' });
  socket.on('my other event', function (data) {
    console.log(data);
  });
});

客户:

var socket = io.connect('http://localhost');
socket.on('news', function (data) {
  console.log(data);
  socket.emit('my other event', { my: 'data' });
});

Socket.send 做同样的事情，但你不是注册到新闻"而是注册消息:

Socket.send does the same, but you don't register to 'news' but to message:

服务器:

var io = require('socket.io').listen(80);

io.sockets.on('connection', function (socket) {
  socket.send('hi');
});

客户:

var socket = io.connect('http://localhost');
socket.on('message', function (message) {
  console.log(message);
});

这篇关于socket.emit() 与 socket.send()的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！