function Wss(config){
    	this.events={};
    	this.ws = new WebSocket(`${config.host}`);
    	this.addEvents();
    	return this;
    }

    Wss.prototype.addEvents=function(){
    	var context=this;
    	this.ws.onmessage=function(e){
    		var data=JSON.parse(e.data)||{};
    		var type=data.type;
    		var payload=data.payload;
    		if (context.events[type]) {
                context.events[type].map((event) => {
                    event.cb(payload);
                    return this;
                });
            }
    	}
    }

    Wss.prototype.on=function(type,fn){
    	if(!this.events[type]){
    		this.events[type]=[{
    			cb:fn
    		}];
    	}else{
    		this.events[type].push({
    			cb:fn
    		});
    	}
    }

    Wss.prototype.send=function(type,payload){
    	var data=JSON.stringify({
    		type:type,
    		payload:payload
    	});
    	this.ws.send(data);
    }

    var ws=new Wss({host:'ws://192.168.6.49:8080'});
    ws.on('people',function(payload){
    	console.log('监听到人数发生了变化',payload);
    })