Question

我是node.js＆amp;的新成员。 socket.io和我试图用我的简单项目从数据库中获取数据。

我的index.html是socket.io与简单的ajax请求实时聊天的工作示例

<!doctype html>
<html>
  <head>
    <title>Socket.IO chat</title>
    <style>
      * { margin: 0; padding: 0; box-sizing: border-box; }
      body { font: 13px Helvetica, Arial; }
      form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
      form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
      form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
      #messages { list-style-type: none; margin: 0; padding: 0; }
      #messages li { padding: 5px 10px; }
      #messages li:nth-child(odd) { background: #eee; }
    </style>
  </head>
  <body>
    <ul id="messages"></ul>
    <form action="">
      <input id="m" autocomplete="off" /><button>Send</button>
    </form>
    <script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
    <script src="http://code.jquery.com/jquery-1.11.1.js"></script>
    <script>
      var socket = io();
      $('form').submit(function(){
        socket.emit('chat message', $('#m').val());
        $('#m').val('');
        return false;
      });
      socket.on('chat message', function(msg){
        $('#messages').append($('<li>').text(msg));
      });

     $.ajax({
      url: '/socket.io/ajax.php?EIO=3&transport=polling&t=1432217406964-0',
        type: 'GET',
        dataType: 'json',
        timeout: 10000,
        error: function (x,e) {
            if (x.status == 0 && e == 'timeout') {
                console.log('Timeout.');
            } else if (x.status == 404) {
                console.log('Error 404.');
            } else if (x.status == 500) {
                console.log('Interal Rrror.');
            } else if (e == 'parsererror') {
                console.log('Failed Request.');
            } else {
                console.log('Unknown error.' + x.responseText);
            }
        },
        success: function (data) {
           console.log(data);
        }
    });
    </script>
  </body>
</html>

我的ajax.php

<?php
    $data = "123aa";
    echo json_encode($data);
?>

最后，但并非最不重要的是，index.js

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);



app.get('/', function(req, res){
  res.sendFile(__dirname + '/index.html');
});

io.on('connection', function(socket){
  socket.on('chat message', function(msg){

    io.emit('chat message', msg);
  });
});

http.listen(3000, function(){
  console.log('listening on *:3000');
});

他们工作正常，但我无法找到为什么我无法访问我的ajax.php并从中获取数据

XHR finished loading: GET "http://localhost:3000/socket.io/?EIO=3&transport=polling&t=1441116957690-0".16.Request.create @ socket.io-1.2.0.js:2Request @ socket.io-1.2.0.js:216.XHR.request @ socket.io-1.2.0.js:216.XHR.doPoll @ socket.io-1.2.0.js:217.Polling.poll @ socket.io-1.2.0.js:217.Polling.doOpen @ socket.io-1.2.0.js:213.Transport.open @ socket.io-1.2.0.js:112.Socket.open @ socket.io-1.2.0.js:1Socket @ socket.io-1.2.0.js:1Socket @ socket.io-1.2.0.js:13.Manager.open.Manager.connect @ socket.io-1.2.0.js:1Manager @ socket.io-1.2.0.js:1Manager @ socket.io-1.2.0.js:1lookup @ socket.io-1.2.0.js:1(anonymous function) @ (index):24
jquery-1.11.1.js:9631 XHR finished loading: GET "http://localhost:3000/socket.io/ajax.php?EIO=3&transport=polling&t=1432217406964-0".jQuery.ajaxTransport.send @ jquery-1.11.1.js:9631jQuery.extend.ajax @ jquery-1.11.1.js:9176(anonymous function) @ (index):34
(index):47 Failed Request.
socket.io-1.2.0.js:2 XHR finished loading: GET "http://localhost:3000/socket.io/?EIO=3&transport=polling&t=1441116957755-1&sid=kPUxnMKOvT2kdHmLAAAO".16.Request.create @ socket.io-1.2.0.js:2Request @ socket.io-1.2.0.js:216.XHR.request @ socket.io-1.2.0.js:216.XHR.doPoll @ socket.io-1.2.0.js:217.Polling.poll @ socket.io-1.2.0.js:217.Polling.onData @ socket.io-1.2.0.js:2(anonymous function) @ socket.io-1.2.0.js:28.Emitter.emit @ socket.io-1.2.0.js:116.Request.onData @ socket.io-1.2.0.js:216.Request.onLoad @ socket.io-1.2.0.js:216.Request.create.xhr.onreadystatechange @ socket.io-1.2.0.js:2
socket.io-1.2.0.js:2 XHR finished loading: GET "http://localhost:3000/socket.io/?EIO=3&transport=polling&t=1441116957858-2&sid=kPUxnMKOvT2kdHmLAAAO".

1 - 我试图从&t=1432217406964-0删除url，或者甚至找出我应该放在这里的内容，但我发现了什么。所以我不知道这是不对的

url: '/socket.io/ajax.php?EIO=3&transport=polling&t=1432217406964-0',

2 - 这是我的文件树

- chat-example-master/  
------ index.html  
------ index.js  
------ ajax.php

3 - 我的package.json

{
  "name": "socket-chat-example",
  "version": "0.0.1",
  "description": "my first socket.io app",
  "dependencies": {
    "express": "4.10.2",
    "socket.io": "1.2.0"
  }
}

那么，我可以使用Ajax从我的数据库中获取数据，以及如何做到这一点？（另外，如果有人可以在URL中解释什么对＆amp; l = xxxxxxxx-0起作用，那就太棒了）

PS：我使用Node.js v0.12.2和Socket.io v1.3.6
PS2：抱歉我的英语很糟糕 PS3：我认为我试图让一些事情变得不可能或者缺少一些非常愚蠢的东西

Answer 1

我懂了！

这个简单的项目帮助我更多地了解了socket.io中node.js的工作原理以及我可以从数据库中获取数据（在这种情况下，没有Ajax http://www.gianlucaguarini.com/blog/push-notification-server-streaming-on-a-mysql-database/

由于

我无法使用socket.io和node.js从数据库中获取数据

1 个答案: