Release : jQuery 1.2.2

Julien Lecomte’s Blog » Gzip Your Minified JavaScript Files - 用 YUI compressor + Gzip 才是正途，用 Packer 做出來的 file size 雖然比較小，不過 Gzip 之後 YUI compressor 才是贏家，Packer 還要另外負擔 unpack 的 overhead ， 作者提供了一個 PHP version 的 Gzip。

The conclusion is clear: for optimal performance, gzip your JavaScript code, and stay away from “advanced” JavaScript compression schemes that look attractive on paper, but end up degrading the performance of your site.

Release:jQuery 1.2.2 - jQuery JavaScript Library

.ready() Overhaul
* Internet Explorer document ready drastically improved. We use a new technique inspired by Diego Perini. It allows us to not have to do a document.write() anymore, which is really fantastic.
* All browsers now wait for CSS to be ready, in addition to just the DOM. In reality, it's not just a vanilla document ready anymore - but we found that users, overwhelmingly, needed to wait for document styling to be active (such as knowing if an element is visible, or what its height is). Specifically we've added improvements to Safari and Opera to make this possible.
* $(document).bind("ready", fn); - You can now watch for the document ready event via the traditional .bind() function. Of course, .ready() still works as you would expect it to.

.bind("mouseenter") / .bind("mouseleave")
The functionality that was the core of the .hover() function has been split out into two new cross-browser events: mouseenter and mouseleave. These are different from mouseover and mouseout as those events will fire as you move in and out of child elements (which is generally not desired). For example, the following are both valid and work perfectly in jQuery 1.2.2:

$("li").hover(function(){
  $(this).addClass("hover");
}, function(){
  $(this).removeClass("hover");
});

$("li").bind("mouseenter", function(){
  $(this).addClass("hover");
}).bind("mouseleave", function(){
  $(this).removeClass("hover");
});

// Checks if an event happened on an element within another element
// Used in jQuery.event.special.mouseenter and mouseleave handlers
var withinElement = function(event, elem) {
 // Check if mouse(over|out) are still within the same parent element
 var parent = event.relatedTarget;
 // Traverse up the tree
 while ( parent && parent != elem ) try { parent = parent.parentNode; } catch(error) { parent = elem; }
 // Return true if we actually just moused on to a sub-element
 return parent == elem;
};

mouseenter: {
 setup: function() {
  if ( jQuery.browser.msie ) return false;
  jQuery(this).bind("mouseover", jQuery.event.special.mouseenter.handler);
  return true;
 },

 teardown: function() {
  if ( jQuery.browser.msie ) return false;
  jQuery(this).unbind("mouseover", jQuery.event.special.mouseenter.handler);
  return true;
 },
 
 handler: function(event) {
  // If we actually just moused on to a sub-element, ignore it
  if ( withinElement(event, this) ) return true;
  // Execute the right handlers by setting the event type to mouseenter
  arguments[0].type = "mouseenter";
  return jQuery.event.handle.apply(this, arguments);
 }
}