我正在设置一个非常基本的节点应用程序,计划是任何人都可以访问该站点并按下一个字母,这将增加一个计数器。然后每个人都可以看到随着世界各地的人们在增加它,这个计数器在上升。它工作得很好,除了我一开始设置它的方式,然后节点服务器每秒联系每个客户端 20 次,这是非常浪费的。
因此,为了避免这种情况,我添加了一个条件,即计数器必须增加才能让节点服务器发送消息。但是当我这样做时,消息从未真正发送给所有客户端,它们如何发送给客户端是一些令人困惑的,显然是随机的顺序。
这是我的第一个节点应用程序,我仍然掌握它的窍门,有人能指出我正确的方向吗?问题可能出在 increment_time 函数中。
服务器部分:
var http=require('http');
var io=require('socket.io');
var fs=require('fs');
var sockFile=fs.readFileSync('text');
server=http.createServer();
//2. get request, via port, http://localhost:8000
server.on('request', function(req, res){
console.log('request received');
res.writeHead(200, {'content-type':'text/html'});
res.end(sockFile);
});
//have server and socket listen to port 8000.
server.listen(8000);
var socket=io.listen(server);
//the lower the number the less chatty the debug becomes.
socket.set('log level', 1);
//initiate the counter.
counter=0;
counterp=0;
//3. on client connect.
//http://<address>/apps/press_k
socket.on('connection', function(socket){
console.log("Client connected.");
//increment counter on clients command.
socket.on('s_increment_counter',function(data){
counter++;
console.log('New counter:'+counter);
});
//send the counter to all clients if it has increased.
increment_time_continuously();
function increment_time(){
//this is the condition that is to limit how often node sends to the clients,
//but setting it on means the counter will be delivered in some erratic way
//to the clients.
//if(counter===counterp) {return;}
//send current counter to all clients.
console.log("passed the equals, now broadcast.");
//this part is clearly only sending to one of them.
socket.emit('c_display_counter', counter);
//client.broadcast.emit('c_display_counter', counter)
//client.send('Welcome client');
counterp=counter;
}
function increment_time_continuously(){setInterval(increment_time,50);}
});
相关客户端部分:
//client_to_server:
//-tell server to increment counter.
function s_increment_counter(){
socket.emit('s_increment_counter',{counter:0});
}
//server_to_client:
//-when server tells to display counter, display counter.
socket.on('c_display_counter',function(counter){
//counter=data["counter"];
k_counter_text.attr({"text":counter});
});