$element.velocity(propertyMap [, duration] [, easing] [, complete])

duration: in milliseconds[e.g. 1000] or "slow","normal","fast".

easing: "ease","ease-in","ease-out","ease-in-out".

queue: false to run immediately.

begin&complete:func()

progress: func()

            $element.velocity({
            opacity: 0
            }, {
            progress: function(elements(元素), percentComplete, timeRemaining, timeStart) {
            console.log((percentComplete * 100) + "%");
            console.log(timeRemaining + "ms remaining!");
            }
            });
        

mobileHA: true/false, deafault:true

loop: nor true[infinite]

delay: milliseconds

display&visibility same to CSS [empty to remove the property altogether]"auto"