jQuery UI API - Easings

Easing functions specify the animation at different points of the traveling speed. jQuery core with two easings: one is linear , the entire animation travels at a constant speed; the other is the swing (jQuery core default easing), the traveling speed slower than the beginning and end of the movie in the middle of the animation. jQuery UI provides some additional easing functions, ranging from swing changes in behavior to the custom effects, such as bouncing.

Some easings will produce a negative in the animation. Depending on the attribute of animation, the actual value may be zero. For example, you can left taken as negative, but not the height or opacity is taken as negative.

Want a better understanding of how to influence easing a movie, you need to spend more time to study the equation Fig. See jQuery UI listed below in the graph of all available animation.