JavaScript实现为指定对象添加多个事件处理程序的方法

/* Start of the multihandle Object...*/function MultiHandle(owner){ var my_handlers = new Array(); var my_owner = owner; this.append = function(handler){  my_handlers[my_handlers.length] = handler; } this.fire = function(evt){  var i;  for(i = 0; i < my_handlers.length; i++){   my_owner.tempspace = my_handlers[i];   my_owner.tempspace(evt);  } }}/* End of the multihandle object*//* start of the object add event handler script */ /*This bit goes where you'd normally write...... object.onmouseup = [event handler]...... where [event handler] is an existing function ...... that handles an event, or even an... anonymous function.*/if(typeof(MultiHandle) != "undefined"){ var mup_handler = object.mh_onmouseup; if(!mup_handler){  mup_handler = new MultiHandle(object);  object.mh_onmouseup = mup_handler;  object.onmouseup = function(evt){  this.mh_onmouseup.fire(evt);  }; } mup_handler.append([event handler]);}else{ object.onmouseup = [event handler];}