我是nodeJs的新手，我找不到我的问题的解决方案。我有一个登录界面我不想在2个用户连接后显示警告。我的问题是警报始终显示第二个用户的联系。 如何在第二个用户登录后显示： 这是我的client.js代码：
var socket = io.connect('http://localhost:5050');
$('#loginform').submit(function(event){
event.preventDefault();
socket.emit('login' , {
username : $('#username').val(),
mail : $('#mail').val()
})
});
socket.on('loged' , function(){
$('#login').fadeOut();
});
socket.on('newuser' , function(user){
$('#users').append('<img src="' + user.avatar + '">');
})
我的代码server.js
var http = require('http');
var fs = require('fs');
var md5 = require('MD5');
var alert=require('alert-node');
var server = http.createServer(function(req, res) {
fs.readFile('./index.html', 'utf-8', function(error, content) {
res.writeHead(200, {"Content-Type": "text/html"});
res.end(content);
});
});
var io = require('socket.io').listen(server);
var users = {};
var i=0;
io.sockets.on('connection', function (socket,user) {
var me;
console.log('new user is connected');
for (k in users) {
socket.emit('newuser' , users[k]);
}
socket.on('login' , function(user){
me=user;
me.id=user.mail.replace('@','-').replace('.','-');
me.avatar = 'https://gravatar.com/avatar/' + md5(user.mail) + '?s=50';
socket.emit('loged');
users[me.id] = me;
io.sockets.emit('newuser', me);
});
});
server.listen(5050);
答案 0 :(得分：0)
我没有看到有关您的代码的任何提醒，因此我假设以下内容，您可以通过// Check if file was uploaded without errors
if(isset($_FILES["school_logo"]) && $_FILES["school_logo"]["error"] == 0) {
// allowed image types
$allowed = array(
"jpg" => "image/jpg",
"pjpg" => "image/pjpeg",
"jpeg" => "image/jpeg",
"gif" => "image/gif",
"png" => "image/png"
);
// some (incoming) file properties
$filename = $_FILES["school_logo"]["name"];
$filetype = $_FILES["school_logo"]["type"];
$filesize = $_FILES["school_logo"]["size"];
// Verify file extension (here we are comparing the file extension to the keys of $allowed array)
$ext = pathinfo($filename, PATHINFO_EXTENSION);
if(!array_key_exists($ext, $allowed)) {
echo "Error: Please select a valid file format.<br/>";
}
// Verify file size - 5MB maximum (5MB is example, you can set anything)
$maxsize = 5 * 1024 * 1024;
if($filesize > $maxsize) {
echo "Error: File size is larger than the allowed limit.<br/>";
}
// Verify MYME type of the file (here we are comparing the file MYME type to the $allowed array values)
if(in_array($filetype, $allowed)) {
$db_coulm_val = "";
$directory = "../uploads/schools_logos/";
$logo_name = $_FILES['school_logo']['name'];
$twmporayr_logo_name = $_FILES['school_logo']['tmp_name'];
$complete_directory_name = $directory.time().$_FILES['school_logo']['name'];
// Check whether file exists before uploading it
if(file_exists("../uploads/schools_logos/" . $_FILES["school_logo"]["name"])) {
echo $_FILES["school_logo"]["name"] . " already exists.<br/>";
} else {
move_uploaded_file($twmporayr_logo_name, $complete_directory_name);
$db_coulm_val = " s_logo = '" . $logo_name . "', ";
}
} else {
echo "Error: There was a problem uploading your file. Please try again.<br/>";
}
} else {
echo "Error: " . $_FILES["school_logo"]["error"] . "<br/>";
}
或已断开连接i++查看已连接的用户数量，但您不会在代码中的任何地方使用它，在这种情况下，我使用i--来存储用户。请注意，如果您在Node.js脚本中使用Map，只需使用alert-node，如果您在浏览器中添加console.log，那么它将使用alert。
const http = require('http');
const fs = require('fs');
const md5 = require('MD5');
const alert=require('alert-node');
var server = http.createServer(function(req, res) {
fs.readFile('./index.html', 'utf-8', function(error, content) {
res.writeHead(200, {"Content-Type": "text/html"});
res.end(content);
});
});
var io = require('socket.io').listen(server);
var users = new Map();
io.sockets.on('connection', function (socket,user) {
console.log('new user is connected');
for (k in users) {
socket.emit('newuser' , users[k]);
}
socket.on('login' , function(user){
let me = user;
me.id=user.mail.replace('@','-').replace('.','-');
me.avatar = 'https://gravatar.com/avatar/' + md5(me.mail) + '?s=50';
users.set(me.id,me)
io.sockets.emit('newuser', me);
socket.emit('loged');
if(users.size === 2){
// notify that they are two users connected?
}
});
});
server.listen(5050);
就个人而言，我会创建一个扩展EventEmitter的类，并使用它更容易维护等等。