Javascript 全局变量和 Socket.io
Javascript 中是否有类似于 PHP 全局变量的“全局变量”函数可以应用于本示例？
var app = require('http').createServer(handler),
io = require('socket.io').listen(app),
fs = require('fs'),
querystring = require('querystring');
app.listen(8000);
var content = '';
function handler(req, res) {
io.sockets.on('connection', function (socket) {
if(req.method == 'POST') {
var fullBody = '';
req.on('data', function(chunk) {
fullBody += chunk.toString();
});
req.on('end', function() {
var decodedBody = querystring.parse(fullBody);
console.log(decodedBody);
socket.emit('user-aaa5c8bbffe4db9', fullBody);
});
}
});
fs.readFile(__dirname + '/index.html',
function(err, data) {
if(err) {
res.writeHead(500);
return res.end('Error loading index.html');
}
res.writeHead(200);
res.end(data);
});
}
我编写了一个 PHP 应用程序，但我想通过 socket.io 收到通知，但我还不想为 Node.js 重写该应用程序，所以我设置了一个 Node 服务器，PHP 将向该服务器发送 POST，然后服务器将通过 Socket.io 发送通知。我已经使用基本脚本测试了服务器，它们确实有效。我还尝试在 IF 语句内移动“io.sockets.on('connection', function (socket) {”：
req.on('end', function() {
var decodedBody = querystring.parse(fullBody);
console.log(decodedBody);
io.sockets.on('connection', function (socket) {
socket.emit('user-aaa5c8bbffe4db9', fullBody);
});
});
但这并没有产生“即时”结果，通知会在页面后传入客户端刷新
客户端很简单：
socket.on('user-<?php echo $_SESSION['user_display_id']; ?>', function (data) {
alert(data);
$('#events').html(data);
});
任何帮助将不胜感激。
Is there any "globals" function in Javascript which is similar to PHP globals that would apply in this example?
var app = require('http').createServer(handler),
io = require('socket.io').listen(app),
fs = require('fs'),
querystring = require('querystring');
app.listen(8000);
var content = '';
function handler(req, res) {
io.sockets.on('connection', function (socket) {
if(req.method == 'POST') {
var fullBody = '';
req.on('data', function(chunk) {
fullBody += chunk.toString();
});
req.on('end', function() {
var decodedBody = querystring.parse(fullBody);
console.log(decodedBody);
socket.emit('user-aaa5c8bbffe4db9', fullBody);
});
}
});
fs.readFile(__dirname + '/index.html',
function(err, data) {
if(err) {
res.writeHead(500);
return res.end('Error loading index.html');
}
res.writeHead(200);
res.end(data);
});
}
I wrote a PHP app but I want to have notifications through socket.io but I don't want to rewrite the app for Node.js (yet) so I setup a Node server which the PHP will send a POST to and then the server will send the notification via Socket.io. I've tested the server with basic scripts and they do work. I've also tried moving the "io.sockets.on('connection', function (socket) {" inside the IF statement:
req.on('end', function() {
var decodedBody = querystring.parse(fullBody);
console.log(decodedBody);
io.sockets.on('connection', function (socket) {
socket.emit('user-aaa5c8bbffe4db9', fullBody);
});
});
But that did not produce "instant" results, the notifications would come in to the client after a page refresh.
Client is a simple:
socket.on('user-<?php echo $_SESSION['user_display_id']; ?>', function (data) {
alert(data);
$('#events').html(data);
});
Any help would be greatly appreciated
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评论（2）
回答你的第一个问题。不，JavaScript 中没有
global。定义该函数的范围内的所有变量都将在该函数中可用。http://javascriptweblog.wordpress.com/2010/10/25/理解-javascript-闭包/
To answer your first question. No there is no
globalin JavaScript. All the variables that are in scope where the function is defined will be available in that function.http://javascriptweblog.wordpress.com/2010/10/25/understanding-javascript-closures/
在node.js中有对象global。
您可以为其属性分配一些值，并且它们可以在任何地方访问，但我认为这不是最佳实践。
In node.js there's the object global.
You can assign to its property some values and they will be accesible everywhere, but I think it is not best practice.