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      JavaScript twenn动画数学计算

      var moveType = {
          /*直线运动*///当前时间*变化量/持续时间+初始值
          line: function(t,b,c,d){ return c*t/d + b; },
      
          /*减速中最长用的是4、6、7*/
          jiansu1: {//二次方的缓动(t^2);
              starIn: function(t,b,c,d){
                  return c*(t/=d)*t + b;
              },
              starOut: function(t,b,c,d){
                  return -c *(t/=d)*(t-2) + b;
              },
              starInOut: function(t,b,c,d){
                  if ((t/=d/2) < 1) return c/2*t*t + b;
                  return -c/2 * ((--t)*(t-2) - 1) + b;
              }
          },
          jiansu2: {//三次方的缓动(t^3)
              starIn: function(t,b,c,d){
                  return c*(t/=d)*t*t + b;
              },
              starOut: function(t,b,c,d){
                  return c*((t=t/d-1)*t*t + 1) + b;
              },
              starInOut: function(t,b,c,d){
                  if ((t/=d/2) < 1) return c/2*t*t*t + b;
                  return c/2*((t-=2)*t*t + 2) + b;
              }
          },
          jiansu3: {//四次方的缓动(t^4);
              starIn: function(t,b,c,d){
                  return c*(t/=d)*t*t*t + b;
              },
              starOut: function(t,b,c,d){
                  return -c * ((t=t/d-1)*t*t*t - 1) + b;
              },
              starInOut: function(t,b,c,d){
                  if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
                  return -c/2 * ((t-=2)*t*t*t - 2) + b;
              }
          },
          jiansu4: {//5次方的缓动(t^5);
              starIn: function(t,b,c,d){
                  return c*(t/=d)*t*t*t*t + b;
              },
              starOut: function(t,b,c,d){
                  return c*((t=t/d-1)*t*t*t*t + 1) + b;
              },
              starInOut: function(t,b,c,d){
                  if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
                  return c/2*((t-=2)*t*t*t*t + 2) + b;
              }
          },
          jiansu5: {//正弦曲线的缓动(sin(t))
              starIn: function(t,b,c,d){
                  return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
              },
              starOut: function(t,b,c,d){
                  return c * Math.sin(t/d * (Math.PI/2)) + b;
              },
              starInOut: function(t,b,c,d){
                  return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
              }
          },
          jiansu6: {//指数曲线的缓动(2^t);
              starIn: function(t,b,c,d){
                  return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
              },
              starOut: function(t,b,c,d){
                  return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
              },
              starInOut: function(t,b,c,d){
                  if (t==0) return b;
                  if (t==d) return b+c;
                  if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
                  return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
              }
          },
          jiansu7: {//圆形曲线的缓动(sqrt(1-t^2));
              starIn: function(t,b,c,d){
                  return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
              },
              starOut: function(t,b,c,d){
                  return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
              },
              starInOut: function(t,b,c,d){
                  if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
                  return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
              }
          },
          /*大摆动的效果,非常绚丽;比xiaobai好*/
          dabai: {//指数衰减的正弦曲线缓动;
              starIn: function(t,b,c,d,a,p){
                  if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
                  if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
                  else var s = 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;
              },
              starOut: function(t,b,c,d,a,p){
                  if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
                  if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
                  else var s = p/(2*Math.PI) * Math.asin (c/a);
                  return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
              },
              starInOut: function(t,b,c,d,a,p){
                  if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);
                  if (!a || a < Math.abs(c)) { a=c; var s=p/4; }
                  else var s = p/(2*Math.PI) * Math.asin (c/a);
                  if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
                  return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
              }
          },
          xiaobai: {//超过范围的三次方缓动((s+1)*t^3 - s*t^2);
              starIn: function(t,b,c,d,s){
                  if (s == undefined) s = 1.70158;
                  return c*(t/=d)*t*((s+1)*t - s) + b;
              },
              starOut: function(t,b,c,d,s){
                  if (s == undefined) s = 1.70158;
                  return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
              },
              starInOut: function(t,b,c,d,s){
                  if (s == undefined) s = 1.70158;
                  if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
                  return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
              }
          },
          fantan: {//指数衰减的反弹缓动。
              starIn: function(t,b,c,d){
                  return c - moveType.fantan.starOut(d-t, 0, c, d) + b;
              },
              starOut: function(t,b,c,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;
                  }
              },
              starInOut: function(t,b,c,d){
                  if (t < d/2) return moveType.fantan.starIn(t*2, 0, c, d) * .5 + b;
                  else return moveType.fantan.starOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
              }
          }
      };
      
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