According to the "jQuery UI Chinese Reference Manual", jQuery UI is a set of user interface interactions, special effects, widgets and themes built on the jQuery JavaScript library. Whether you're creating a highly interactive web application or just adding a date picker to a form control, jQuery UI is a perfect choice. jQuery UI contains many widgets that maintain state, so it is slightly different from the typical jQuery plug-in usage pattern.
"jQuery UI Chinese Reference Manual" will teach you to learn jQuery UI knowledge from basic to advanced. The manual contains a large number of jQuery UI online examples. You are welcome to click to run the examples to view them.