通用的事件监听函数

/*绑定事件与取消绑定*/
var handleHash ={};
var bind =(function(){
  if(window.addEventListener){
    return function(e1,type,fn,capture){
      e1.addEventListener(type,function() {
        fn();
        handleHash[type]=handleHash[type] ||[];
        handleHash[type].push(arguments.callee);
      },capture);
    };
  }else if(window.attachEvent){
    return function(e1,type,fn,capture) {
      e1.attachEvent("on"+type,function(){
        fn();
        handleHash[type]=handleHash[type] ||[];
        handleHash[type].push(arguments.callee);
      })
      
    }
  }
})();
var unbind =(fuction(){
  if(window.addEventListener){
    return funtion(e1,type){
      if(handleHash[type]){
        var i=0,len = handleHash[type].length;
        for(i;i<len;i+=1){
          e1.removeEventListener(type,handleHash[type][i]);
        }
      };
    };
  }else if(window.attachEvent){
    return function(e1,type){
      if(handleHash[type]){
        var i=0,len = handleHash[type].length;
        for(i;i<len;i+=1){
          e1.detachEvent("on"+type,handleHash[type][i]);
        }
      }
    }
  }
})();