js监听模式模拟事件监听

    function Handle(){
        this.events={};
        this.addEventListener=function(type,fn){
            //添加订阅
            if(!this.events[type]){
                this.events[type]=[];
            }
            this.events[type].push(fn);
        };
        this.click=function(){
            //模拟click方法
            this.publish("click");
        };
        this.publish=function(type){
            for(var index in this.events[type])
            {
                this.events[type][index].call(this);
            }
        };
        this.removeEventListener=function(type,fn){
            if(arguments.length==1){
                throw new Error("该方法必须存在两个参数！");
                return;
            }
            //删除订阅
            var fnlist=this.events[type];
            var funindex=fnlist.findIndex(function(item){
                return item.name===fn;
            });
            fnlist.splice(funindex,1);
        }
    }
    var myEvent=new Handle();
    myEvent.addEventListener("click",function(){
        console.log("函数1");
    });
    myEvent.addEventListener("click",method);
    function method(){
        console.log("函数2");
    }
    myEvent.removeEventListener("click",method);
    myEvent.click();