} else {
return start+alter+0.5*extent*Math.pow(2,-10*(progress-=1)) * Math.sin( (progress*dur-s)*(2*Math.PI)/cycle);
}
}
},
Back:{
easeIn: function (start,alter,curTime,dur,s){
if (typeof s == "undefined") {s = 1.70158;}
return start+alter*(curTime/=dur)*curTime*((s+1)*curTime - s);
},
easeOut: function (start,alter,curTime,dur,s) {
if (typeof s == "undefined") {s = 1.70158;}
return start+alter*((curTime=curTime/dur-1)*curTime*((s+1)*curTime + s) + 1);
},
easeInOut: function (start,alter,curTime,dur,s){
if (typeof s == "undefined") {s = 1.70158;}
if ((curTime/=dur/2) < 1) {
return start+alter/2*(Math.pow(curTime,2)*(((s*=(1.525))+1)*curTime- s));
}
return start+alter/2*((curTime-=2)*curTime*(((s*=(1.525))+1)*curTime+ s)+2);
}
},
Bounce:{
easeIn: function(start,alter,curTime,dur){
return start+alter-Tween.Bounce.easeOut(0,alter,dur-curTime,dur);
},
easeOut: function(start,alter,curTime,dur){
if ((curTime/=dur) < (1/2.75)) {
return alter*(7.5625*Math.pow(curTime,2))+start;
} else if (curTime < (2/2.75)) {
return alter*(7.5625*(curTime-=(1.5/2.75))*curTime + .75)+start;
} else if (curTime< (2.5/2.75)) {
return alter*(7.5625*(curTime-=(2.25/2.75))*curTime + .9375)+start;
} else {
return alter*(7.5625*(curTime-=(2.625/2.75))*curTime + .984375)+start;
}
},
easeInOut: function (start,alter,curTime,dur){
if (curTime< dur/2) {
return Tween.Bounce.easeIn(0,alter,curTime*2,dur) *0.5+start;
} else {
return Tween.Bounce.easeOut(0,alter,curTime*2-dur,dur) *0.5 + alter*0.5 +start;
}
},
easeOutBounce: function (b, c, t, d) {
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
} else {
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
}
}
},
//start,alter,curTime,dur
easeOutBounce: function (b, c, t, d) {
if ((t/=d) < (1/2.75)) {
return c*(7.5625*t*t) + b;
} else if (t < (2/2.75)) {
return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
} else {
return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
}
}
};
jQuery(function($){
//两种动画方式对比，在w3c浏览器中是一致的，在IE中有差异（即使用同算法）
$("#start").click(function(){
//自定义动画函数
animate(Fid("song"), {opacity:0.3, left:400}, 2000, Tween.easeOutBounce);
//jq动画效果
$("#jian").animate( {opacity:0.3, left:400}, 2000, 'easeOutBounce')
})
/*
参数说明
o:要动画的对象
