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  • [Node.js]30. Level 6: Listen 'Question' from client, and then Answer the Question

    Clients can also answer each other questions, so let's build that feature by first listening for the'answer' event on the client, which will send us both the question and answer, which we want to broadcast out to the rest of the connected clients.

    var express = require('express');
    var app = express.createServer();
    var socket = require('socket.io');
    var io = socket.listen(app);
    
    io.sockets.on('connection', function(client) {
      console.log("Client connected...");
    
      // listen for answers here
    
      client.on('question', function(question) {
        client.get('question_asked', function(err, asked) {
          if(!asked) {
            client.set('question_asked', true);
            client.broadcast.emit('question', question);
          }
        });
    //can pass two or more params in callback function client.on(
    'answer', function(question,answer) { client.broadcast.emit('answer',question, answer); }); }); });

    Now on the client, listen for the 'answer' event and call the answerQuestion function, passing in both the question and the answer that was broadcasted from the server.

    <script src="/socket.io/socket.io.js" />
    
    <script>
      var server = io.connect('http://localhost:8080');
    
      server.on('question', function(question) {
        insertQuestion(question);
      });
    
    server.on('answer', function(question, answer){
        answerQuestion(question, answer);
    });
        
      //Don't worry about these methods, just assume 
      //they insert the correct html into the DOM
      // var insertQuestion = function(question) {
      // }
    
      // var answerQuestion = function(question, answer) {
      // }
    </script>
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  • 原文地址:https://www.cnblogs.com/Answer1215/p/3881423.html
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