JavaScript绑定事件监听函数的通用方法

 function addEvent( obj, type, fn ) {
  if ( obj.attachEvent ) {
   obj['e'+type+fn] = fn;
   obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
   obj.attachEvent( 'on'+type, obj[type+fn] );
  } else
   obj.addEventListener( type, fn, false );
 }
 function removeEvent( obj, type, fn ) {
  if ( obj.detachEvent ) {
   obj.detachEvent( 'on'+type, obj[type+fn] );
   obj[type+fn] = null;
  } else
   obj.removeEventListener( type, fn, false );
 }

function addEvent(element, type, handler) {
 if (!handler.$$guid) handler.$$guid = addEvent.guid++;
 if (!element.events) element.events = {};
  var handlers = element.events[type];
 if (!handlers) {
  handlers = element.events[type] = {};
  if (element["on" + type]) {
   handlers[0] = element["on" + type];
  }
 }
 handlers[handler.$$guid] = handler;
 element["on" + type] = handleEvent;
}

addEvent.guid = 1;
 
function removeEvent(element, type, handler) {
 if (element.events && element.events[type]) {
  delete element.events[type][handler.$$guid];
 }
}
function handleEvent(event) {
 var returnValue = true;
 event = event || fixEvent(window.event);
 var handlers = this.events[event.type];
 for (var i in handlers) {
  this.$$handleEvent = handlers[i];
  if (this.$$handleEvent(event) === false) {
   returnValue = false;
  }
 }
 return returnValue;
};
 
function fixEvent(event) {
 event.preventDefault = fixEvent.preventDefault;
 event.stopPropagation = fixEvent.stopPropagation;
 return event;
};
fixEvent.preventDefault = function() {
 this.returnValue = false;
};
fixEvent.stopPropagation = function() {
 this.cancelBubble = true;
}; 

 Array.prototype.indexOf = function( obj ){
 var result = -1 , length = this.length , i=length - 1;
 for ( ; i>=0 ; i-- ) {
  if ( this[i] == obj ) {
   result = i;
   break;
  }
 }
 return result;
}
Array.prototype.contains = function( obj ) {
 return ( this.indexOf( obj ) >=0 )
}
Array.prototype.append = function( obj , nodup ) {
 if ( !(nodup && this.contains( obj )) ) {
  this[this.length] = obj;
 }
}
Array.prototype.remove = function( obj ) {
 var index = this.indexOf( obj );
 if ( !index ) return ;
 return this.splice( index , 1);
};
function addEvent(element , type , fun){
 if (!element.events) element.events = {};   
 var handlers = element.events[type];
 if (!handlers) {
  handlers = element.events[type] = [];
  if(element['on' + type]) {  
   handlers[0] = element['on' + type];
  }
 }
 handlers.append( fun , true)
 element['on' + type] = handleEvent;
}
function removeEvent(element , type , fun) {
 if (element.events && element.events[type]) {
  element.events[type].remove(fun); 
 }
}
function handleEvent(event) {
 var returnValue = true , i=0;
 event = event || fixEvent(window.event);
 var handlers = this.events[event.type] , length = handlers.length;
 for ( ; i < length ; i++) {
  if ( handlers[i].call( this , event) === false ){
   returnValue = false;
  }
 }
 return returnValue;
}
function fixEvent(event) {
 event.preventDefault = fixEvent.preventDefault;
 event.stopPropagation = fixEvent.stopPropagation;
 return event;
}
fixEvent.preventDefault = function() {
 this.returnValue = false;
};
fixEvent.stopPropagation = function() {
 this.cancelBubble = true;
};