//t当前时间 b初始值 c变化量 d持续时间
linear: function(t,b,c,d){//匀速
returnc*t/d+b;
},
easeIn: function(t,b,c,d){//加速曲线
returnc*(t/=d)*t+b;
},
easeOut: function(t,b,c,d){//减速曲线
return -c*(t/=d)*(t-2)+b;
},
easeBoth: function(t,b,c,d){//加速减速曲线
if((t/=d/2)<1) {
returnc/2*t*t+b;
}
return -c/2*((--t)*(t-2)-1)+b;
},
easeInStrong: function(t,b,c,d){//加加速曲线
returnc*(t/=d)*t*t*t+b;
},
easeOutStrong: function(t,b,c,d){//减减速曲线
return -c*((t=t/d-1)*t*t*t-1)+b;
},
easeBothStrong: function(t,b,c,d){//加加速减减速曲线
if((t/=d/2)<1) {
returnc/2*t*t*t*t+b;
}
return -c/2*((t-=2)*t*t*t-2)+b;
},
elasticIn: function(t,b,c,d,a,p){//正弦衰减曲线（弹动渐入）
if(t===0) {
returnb;
}
if( (t/=d)==1) {
returnb+c;
}
if(!p) {
p=d*0.3;
}
if(!a||a
a=c;
vars=p/4;
}else{
vars=p/(2*Math.PI)*Math.asin(c/a);
}
return -(a*Math.pow(2,10*(t-=1))*Math.sin( (t*d-s)*(2*Math.PI)/p))+b;
},
elasticOut: function(t,b,c,d,a,p){//正弦增强曲线（弹动渐出）
if(t===0) {
returnb;
}
if( (t/=d)==1) {
returnb+c;
}
if(!p) {
p=d*0.3;
}
if(!a||a
a=c;
vars=p/4;
}else{
vars=p/(2*Math.PI)*Math.asin(c/a);
}
returna*Math.pow(2,-10*t)*Math.sin( (t*d-s)*(2*Math.PI)/p)+c+b;
},
elasticBoth: function(t,b,c,d,a,p){
if(t===0) {
returnb;
}
if( (t/=d/2)==2) {
returnb+c;
}
if(!p) {
p=d*(0.3*1.5);
}
if(!a||a
a=c;
vars=p/4;
}
else{
vars=p/(2*Math.PI)*Math.asin(c/a);
}
if(t<1) {
return -0.5*(a*Math.pow(2,10*(t-=1))*
Math.sin( (t*d-s)*(2*Math.PI)/p))+b;
}
returna*Math.pow(2,-10*(t-=1))*
Math.sin( (t*d-s)*(2*Math.PI)/p)*0.5+c+b;
},
backIn: function(t,b,c,d,s){//回退加速（回退渐入）
if(typeofs=='undefined') {
s=1.70158;
}
returnc*(t/=d)*t*((s+1)*t-s)+b;
},
backOut: function(t,b,c,d,s){
if(typeofs=='undefined') {
s=3.70158;//回缩的距离
}
returnc*((t=t/d-1)*t*((s+1)*t+s)+1)+b;
},
backBoth: function(t,b,c,d,s){
if(typeofs=='undefined') {
s=1.70158;
}
if((t/=d/2)<1) {
returnc/2*(t*t*(((s*=(1.525))+1)*t-s))+b;
}
returnc/2*((t-=2)*t*(((s*=(1.525))+1)*t+s)+2)+b;
},
bounceIn: function(t,b,c,d){//弹球减振（弹球渐出）
returnc-Tween['bounceOut'](d-t,0,c,d)+b;
},
bounceOut: function(t,b,c,d){
if((t/=d)<(1/2.75)) {
returnc*(7.5625*t*t)+b;
}else if(t<(2/2.75)) {
returnc*(7.5625*(t-=(1.5/2.75))*t+0.75)+b;
}else if(t<(2.5/2.75)) {
returnc*(7.5625*(t-=(2.25/2.75))*t+0.9375)+b;
}
returnc*(7.5625*(t-=(2.625/2.75))*t+0.984375)+b;
},
bounceBoth: function(t,b,c,d){
if(t
returnTween['bounceIn'](t*2,0,c,d)*0.5+b;
}
returnTween['bounceOut'](t*2-d,0,c,d)*0.5+c*0.5+b;
}
