//动画形式公式
var Tween = {
linéaire : fonction (t, b, c, d){
return c*t/d + b;
},
easyIn : fonction(t, b, c, d){
return c*(t/=d)*t + b;
},
easyOut : fonction(t, b, c, d ){
return -c *(t/=d)*(t-2) + b;
},
easyBoth : function(t, b, c, d){
if ( (t/=d/2) < 1) {
retourner c/2*t*t + b;
}
retourner -c/2 * ((--t)*(t- 2) - 1) + b;
},
easyInStrong : function(t, b, c, d){
return c*(t/=d)*t*t*t + b;
},
easyOutStrong : function(t, b, c, d){
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easyBothStrong : 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;
},
elasticIn : fonction (t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
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;
},
elasticOut : function(t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d ) == 1 ) {
return b+c;
}
if (!p) {
p=d*0.3;
}
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;
},
elasticBoth : function(t, b, c, d, a, p){
if (t === 0) {
return b;
}
if ( (t /= d/2) == 2 ) {
return b+c;
}
if (!p) {
p = d*(0.3 *1.5);
}
if ( !a || a < Math.abs(c) ) {
a = c;
var s = p/4;
}
autre {
var s = 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;
}
return a*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){
if (typeof s = = 'indéfini') {
s = 1.70158;
}
return c*(t/=d)*t*((s+1)*t - s) + b;
} ,
backOut : function(t, b, c, d, s){
if (typeof s == 'indéfini') {
s = 2,70158 ; //回缩的距离
}
return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
} ,
backBoth : function(t, b, c, d, s){
if (typeof s == 'indéfini') {
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;
},
rebondIn : function(t, b, c, d){
return c - Tween['bounceOut'](d-t, 0, c, d) + b;
},
rebond: 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 + 0.75) + b;
} else if (t < (2.5/2.75)) {
return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;
}
return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;
},
rebondLes deux : function(t, b, c, d){
if ( t < d/2) {
return Tween['bounceIn'](t*2, 0, c, d) * 0.5 + b;
}
return Tween['bounceOut'](t *2-d, 0, c, d) * 0,5 + c*0,5 + b;
}
}
// 获取或者设置样式
fonction css(el,attr,val){
if(arguments.length == 2){
if(el.currentStyle){
val = el.currentStyle[attr];
} else {
val = getComputedStyle(el) [attr];
}
return parseFloat(val);
} else {
if(attr == "opacity"){
el.style.opacity = val;
el.style.filter = "alpha(opacity= "+val*100+")";
} else if(attr == "zIndex"){
el.style[attr] = Math.round( val)( init){
clearInterval(init.el.timer);
var t = 0;
var b = {};
var c = {};
var d = init.time/20;
for( var s in init.target){
b[s] = css(init.el,s);
c[s] = init.target[s] - b[s];
}
init.el.timer = setInterval(function(){
t++;
if(t > d){
clearInterval(init.el.timer);
init.callBack&&init.callBack();
} else {
for(var s dans init.target){
var val = Tween[init.type](t,b[s],c[s],d);
css(init.el,s,val);
}
}
},20);
}
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