var wsc2={ 
        url : 'ws://127.0.0.1:9999',        
        ws:null,
		is_onlien:false,
		timer_ping:null,
		timer_close:null,
		interval_ping:10000,
		interval_close:5000,
        init:function(){
			var self=this;
			self.ws= new WebSocket(self.url);
			
			self.ws.onopen = function(evt) { 
			  console.log("Connection open ..."); 
			   
			  self.is_onlien=true;
			  self.ws.send("client connect success");
			  
			  start_heartbeat();
			};
			
			self.ws.onmessage = function(evt) {
			  if(evt.data=="ping"){
				 self.send("pong");
				 console.log("on ping");
			  }
			  else if(evt.data=="pong"){
				  console.log("on pong");
			  }
			  else{
				console.log( "Received Message: " + evt.data);  
			  }	
				
				clearTimeout(self.timer_close);
				clearTimeout(self.timer_ping);
				start_heartbeat();
			};
			
			self.ws.onclose = function(evt) {
			  console.log("Connection closed.");
			}; 
			
			self.ws.onerror=function(evt){
				console.log(evt);
			};

			function start_heartbeat(){
				self.timer_ping=setTimeout(function(){
					self.send("ping");
					
					self.timer_close=setTimeout(function(){
						self.ws.close();
						self.is_onlien=false;
						on_offline();
					},self.interval_close);
				},self.interval_ping);
			};
			
			function on_offline(){
				
			}
		},
		send:function(data){
			this.ws.send(data);
		},			
 }