AjaxRain has many examples of perfect integration of AJAX, CSS, DHTML or Javascript. Some demos are really worth taking a look at, even if you are not a web designer (developer).
Ajax Daddy has collected a large number of beautiful Web2.0 tools. One of the functions used is that before you apply an Ajax/Javascript instance to your website, you can see the effect demonstration on it.
MiniAJAX is a new website that collects a few DHTML and AJAX scripts. Its code snippet style is very practical.
A portal-like AJAX resource site, including Ajax sample collection, blogs, forums and tutorials, etc.
DHTML Goodies is a website that collects a large number of DHTML, Ajax scripts, demos and tutorials. Scripts range from navigation menus, windows, calendars to image collections.
Collects a large number of Javascript tutorials and scripting resources. Of course, there are also DHTML, CSS and web design tutorials and a designer help forum.
A JavaScript and CSS resource website that I often visit. Even if you are a beginner, you can find detailed guidance on DHTML, Javascript, and client-side scripts.
You can find a large number of swimming AJAX and DHTML scripts and tutorials from the DHTML Site. The scripts cover page effects, tool skills, drag-and-drop calendars, window effects and photo gallery effects.
This website has collected quite a lot of great examples and tutorials of javascript and ajax. There are also many Javascript frameworks such as jQuery, Scriptaculous, and mootools.