dom二级事件绑定

function  fn(ele,type,hander){
    if(ele.addEventListener){
         ele.addEventListener(type,hander,false);
    }else{
         if(!ele['onEvent'+type]){
              ele['onEvent'+type]=[];
         }
         var events=ele['onEvent'+type];
         if(events&&events.length){
             for(var i=0;i<events.length;i++){
                   if(events[i].events=hander){
                        return;
                   }
             }
         }
         function Fn(e){
             hander.call(ele,e);
         }
        ele.attachEvent('on'+type,Fn);
        Fn.events=hander;
        events.push[Fn];
    }
}
移除时要保证三者一致  1、事件行为2、处理函数 3、阶段