code: function(el, type, func) {
        if (el.removeEventListener){ 
          el.removeEventListener(type, func, false);
        } else if (el.detachEvent){
          el.detachEvent('on' + type, func);
        } else {
          delete el['on' + type];
        }
      }
docs: [remove event to some element, dom0, dom1, supports fuck ie]
  
  @param el {Object}       -- element.
  @param type {String}     -- event type, such as 'click', 'mouseover'.
  @param func {Function}   -- function.