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这是YUI的源码及相关示例。里面有很多很炫的Javascript效果。

    * "clearContent" - Removes all of the content from the menu, including the 
      menu items, group titles, header and footer.


* Added three new configuration attributes to YAHOO.widget.Menu:

    * "submenuhidedelay" - Number indicating the time (in milliseconds) that 
      should expire before a submenu is hidden when the user mouses out of a 
      menu item heading in the direction of a submenu. The value must be 
      greater than or equal to the value specified for the "showdelay" 
      configuration property.

    * "maxheight" - Defines the maximum height (in pixels) for a menu before 
      the contents of the body are scrolled. 

    * "classname" - CSS class to be applied to the menu's root <div> element. 
      The specified class(es) are appended in addition to the default class as 
      specified by the menu's CSS_CLASS_NAME constant.


* Added new constants to YAHOO.widget.MenuItem:

    * COLLAPSED_SUBMENU_INDICATOR_TEXT - String representing the text for the 
      <em> element used for the submenu arrow indicator.

    * EXPANDED_SUBMENU_INDICATOR_TEXT - String representing the text for the 
      submenu arrow indicator element (<em>) when the submenu is visible.

    * DISABLED_SUBMENU_INDICATOR_ALT_TEXT - String representing the text for 
      the submenu arrow indicator element (<em>) when the menu item is disabled.

    * CHECKED_TEXT - String representing the text to be used for the checked 
      indicator element (<em>).

    * DISABLED_CHECKED_TEXT - String representing the text to be used for the 
      checked indicator element (<em>) when the menu item is disabled.


* Added two new configuration attributes to YAHOO.widget.MenuItem:

    * "onclick" - Object literal representing the code to be executed when the 
      button is clicked. Format:

        {
            fn: Function, // The handler to call when the event fires.
            obj: Object, // An object to pass back to the handler.
            scope: Object // The object to use for the scope of the handler.
        }
    
    * "classname" - CSS class to be applied to the menu item's root <li> 
      element. The specified class(es) are appended in addition to the default 
      class as specified by the menu item's CSS_CLASS_NAME constant.


* Added an "id" property to YAHOO.widget.MenuItem that represents the id of
  the menu item's root <li> node.  Although not a configuration attribute, this
  property should be set via the object literal of configuration attributes 
  passed as the second argument to the constructor.  If no value is 
  specified, then one will be generated using the "generateId" method of the 
  Dom utility (YAHOO.widget.Dom).

* Added a "trigger context menu event" 
  (YAHOO.widget.ContextMenu.triggerContextMenuEvent) that fires when the DOM 
  "contextmenu" event ("mousedown" for Opera) is fired by one of the elemeents
  defined as a YAHOO.widget.ContextMenu instance's trigger.

* Added a "cancel" method to YAHOO.widget.ContextMenu that can be used to 
  cancel the display of a YAHOO.widget.ContextMen instance.  This method 
  should be called within the scope of a "context menu" event handler for 
  one of the context menu's triggers 
  (YAHOO.widget.ContextMenu.triggerContextMenuEvent).


Fixed the following bugs:
-------------------------

* Users can now move diagonally from a menu item to its corresponding submenu 
  without the submenu hiding immediately.

* "destroy" method of YAHOO.widget.Menu now unsubscribes from the "text resize"  
  event (YAHOO.widget.Module.textResizeEvent).

* Browser progress bar no longer flashes when hovering over checked menu items 
  or menu items with submenus.

* Menu item submenu indicator image no longer jumps to the next line in 
  quirks mode.

* Mouse events no longer fire in Firefox if a YAHOO.widget.Menu instance is 
  moved by script into a stationary mouse pointer.

* Modified "toString" method of YAHOO.widget.ContextMenuItem to return the 
  correct class name, as it was reporting as YAHOO.widget.MenuBarItem.


Changes:
--------

* Default value for the "showdelay" configuration attribute is now 250

* Modified code so that all Menu images are added via CSS background images.  
  As a result, the following constants and properties have been deprecated:

    * YAHOO.widget.MenuItem.SUBMENU_INDICATOR_IMAGE_PATH
    * YAHOO.widget.MenuItem.SELECTED_SUBMENU_INDICATOR_IMAGE_PATH
    * YAHOO.widget.MenuItem.DISABLED_SUBMENU_INDICATOR_IMAGE_PATH
    * YAHOO.widget.MenuItem.COLLAPSED_SUBMENU_INDICATOR_ALT_TEXT
    * YAHOO.widget.MenuItem.EXPANDED_SUBMENU_INDICATOR_ALT_TEXT
    * YAHOO.widget.MenuItem.DISABLED_SUBMENU_INDICATOR_ALT_TEXT
    * YAHOO.widget.MenuItem.CHECKED_IMAGE_PATH
    * YAHOO.widget.MenuItem.SELECTED_CHECKED_IMAGE_PATH
    * YAHOO.widget.MenuItem.DISABLED_CHECKED_IMAGE_PATH
    * YAHOO.widget.MenuItem.CHECKED_IMAGE_ALT_TEXT
    * YAHOO.widget.MenuItem.DISABLED_CHECKED_IMAGE_ALT_TEXT
    * YAHOO.widget.MenuItem.IMG_ROOT
    * YAHOO.widget.MenuItem.IMG_ROOT_SSL
    * YAHOO.widget.MenuItem.imageRoot
    * YAHOO.widget.MenuItem.isSecure



*** version 0.12.2 ***

* No changes



*** version 0.12.1 ***

Fixed the following bugs:
-------------------------

* Placed the call to the DOM "focus" method used by the MenuItem class inside 
  a zero-second timeout to resolve a race condition between menu positioning 
  and focusing of a menu item that resulted in the browser viewport 
  scrolling unnecessarily.

* Switched to JSMin for JavaScript compression to resolve issues with the 
  minified version.  

* Disabled menu item instances will no longer display a submenu if the item is 
  clicked or moused over. 

* Can no longer select more than one item in a menu if using the keyboard and 
  mouse simultaneously.

* Calling the "destory" method on a menu will now unregister all of the menu's 
  submenus from the MenuManager.  



*** version 0.12 ***

Added the following features:
-----------------------------

* Added the YAHOO.widget.MenuManager singleton class.

* Added two new methods to YAHOO.widget.Menu:

    * "addItems" - Adds an array of items to a menu.

    * "getRoot" - Returns the root menu in a menu hierarchy.

* Added two new events to YAHOO.widget.Menu:

    * "itemAddedEvent" - Fires when an item is added to a menu.

    * "itemRemovedEvent" - Fires when an item is removed from a menu.

* Added two new properties to YAHOO.widget.Menu:

    * "itemData" - Array of items to be added to the menu.

    * "lazyLoad" - Boolean indicating if the menu's "lazy load" feature 
      is enabled.

* Added new configuration properties to YAHOO.widget.Menu:

    * "hidedelay" - Hides the menu after the specified number of milliseconds.  

    * "showdelay" - Shows the menu after the specified number of milliseconds.  

    * "container" - The containing element the menu should be rendered into.  

    * "clicktohide" - Boolean indicating if the menu will automatically be 
      hidden if the user clicks outside of it.

    * "autosubmenudisplay" - Boolean indicating if submenus are automatically 
      made visible when the user mouses over the menu's items.

* Added a "toString" method to YAHOO.widget.MenuItem, YAHOO.widget.MenuBarItem 
  and YAHOO.widget.ContextMenuItem that returns the class name followed by the 
  value of the item's "text" configuration property.


Fixed the following bugs:
-------------------------

* Setting a YAHOO.widget.ContextMenu instance's "trigger" configuration 
  property will remove all previous triggers before setting up the new ones.

* "destroy" method of YAHOO.widget.ContextMenu cleans up all DOM event handlers.

* Clicking on a menu item with a submenu no longer hides/collapses the 
  entire menu.

* Clicking an item's submenu indicator image no longer collapses the 
  entire menu.
  
  
Changes:
--------

* Deprecated the YAHOO.widget.MenuModule and YAHOO.widget.MenuModuleItem 
  classes.  The Base classes are now YAHOO.widget.Menu and 
  YAHOO.widget.MenuItem.

* "addItem" and "insertItem" methods of YAHOO.widget.Menu now accept an 
  object literal representing YAHOO.widget.MenuItem configuration properties.

* "clearActiveItem" now takes an argument: flag indicating if the Menu 
  instance's active item should be blurred.

* Switched the default value of the "visible" configuration property for 
  YAHOO.widget.Menu to "false."

* Switched the default value of the "constraintoviewport" configuration 
  property for YAHOO.widget.Menu to "true."

* Overloaded the "submenu" configuration property for YAHOO.widget.MenuItem
  so that it now can accept any of the following:

    * YAHOO.widget.Menu instance
    * Object literal representation of a menu
    * Element id
    * Element reference

* "hide" and "show" methods of statically positioned menus now toggle the their
  element's "display" style property between "block" and "none."



*** version 0.10.0 ***

* Initial release

* Known issues:

      * Some Firefox extensions disable the ability for JavaScript to prevent  
        the display of the browser's default context menu.  These extensions
        can cause the YUI ContextMenu to stop working.  If you encounter this 
        problem, you can reset the context menu preference in Firefox back to 
        the default by making sure the "Disable or replace context menus" 
        preference is checked:

            Mac Firefox 1.0: 
            -------------------
            Preferences > Web Features > 
                Advanced... > Disable or replace context menus

            Mac Firefox 1.5
            -------------------
            Preferences > Context > 
                Advanced... > Disable or replace context menus

            Windows Firefox 1.0
            -------------------
            Tools > Options > Web Features > 
                Advanced... > Disable or replace context menus

            Windows Firefox 1.5
            -------------------
            Tools > Options > Context > 
                Advanced... > Disable or replace context menus



*** version 0.11.3 ***

Added the following features:
-----------------------------

* Added a "target" configuration property to the MenuModuleItem object that
  allows the user to specify the target of an item's anchor element.  Items 
  that make use of the "target" configuration property will require the user 
  to click exactly on the item's anchor element to navigate to the specified 
  URL.

* Items without a "url" property set will automatically hide their parent 
  menu instance(s) when clicked.


Fixed the following bugs:
-------------------------

* Items in a submenu should now navigate to their specified URL when clicked.

* Removed MenuBar's use of "overflow:hidden."  This fixes an issue in Firefox
  1.5 in which submenus of a Menubar instance cannot overlay other absolutely 
  positioned elements on the page.

* Submenus of a Menubar instance will now automatically have their iframe shim
  enabled in IE<7.

* Statically positioned Menubar and Menu instances will now render with the 
  correct position and dimensions in Safari.

* MenuModuleItem's "focus" method now checks to make sure that an item's 
  "display" style property is not "none" before trying to set focus to its
  anchor element.
  
* A ContextMenu instance will now hide all other ContextMenu instances before
  displaying itself.

* Removed the dead space in front of an item's submenu indicator image in IE.  
  This space was causing an item's submenu to flicker when the user hovered 
  over it.


Changes:
--------

* Moved the DOM event handlers for every menu from the root DIV node of each 
  instance to the document object.  This change reduces the number of DOM event 
  handlers used by Menu to eight, improving the cleanup time required by the 
  Event utility.

                

*** version 0.11.0 ***

Added the following features:
-----------------------------
* Overloaded the "addItem" and "insertItem" methods of MenuModule to accept a 
  string or a MenuModuleItem instance

* Added the ability to define a MenuItem instance as being "checked"


Fixed the following bugs:
-------------------------
* Changing the path for the submenu indicator image of one MenuModuleItem 
  subclass will no longer affect other subclasses

* MenuItem instances built from existing markup without anchor tags will no 
  longer trigger a JavaScript error when clicked

* Modified the implementation of the "imageRoot" property for the 
  MenuModuleItem class so that it is set to a secure/non-secure path when the
  object is instantiated

* Menu instances now resize in response to changes to the browser's font size

* Modified the propagation of the MenuModule class's "submenualignment" 
  configuration property so that it only applies to instances of the same type

* Adjusted the specificity of the style rule that controls the position of a 
  MenuItem instance's submenu indicator image to prevent it from wrapping in IE

* Specified a width and height for submenu indicator images in the Menu 
  stylesheet to ensure that Menu instances are always rendered at the correct 
  width

* Clicking a MenuItem instance will no longer trigger two HTTP GET requests

* Users can now control or shift-click on MenuItem links


Changes:
--------
* In the Menu stylesheet (menu.css), switched from using "first" class to
  "first-of-type" class

* Changed case of MenuModuleItem class's "subMenuIndicator" property 
  to "submenuIndicator"