JAVAScript(Tween动画)

var Tween = {

linear: function (t, b, c, d){

return c*t/d + b;

},

easeIn: function(t, b, c, d){

return c*(t/=d)*t + b;

},

easeOut: function(t, b, c, d){

return -c *(t/=d)*(t-2) + b;

},

easeBoth: function(t, b, c, d){

if ((t/=d/2) < 1) {

return c/2*t*t + b;

}

return -c/2 * ((--t)*(t-2) - 1) + b;

},

easeInStrong: function(t, b, c, d){

return c*(t/=d)*t*t*t + b;

},

easeOutStrong: function(t, b, c, d){

return -c * ((t=t/d-1)*t*t*t - 1) + b;

},

easeBothStrong: 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: 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-=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;

}

else {

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 == 'undefined') {

s = 1.70158;

}

return c*(t/=d)*t*((s+1)*t - s) + b;

},

backOut: function(t, b, c, d, s){

if (typeof s == 'undefined') {

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 == '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;

},

bounceIn: function(t, b, c, d){

return c - Tween['bounceOut'](d-t, 0, c, d) + b;

},

bounceOut: 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;

},

bounceBoth: 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;

}

};

/* 当css的参数个数小于3,获取否则 设置 */

function css(el,attr,val) {

if(arguments.length < 3) {

var val  = 0;

if(el.currentStyle) {

val = el.currentStyle[attr];

} else {

val = getComputedStyle(el)[attr];

}

if(attr == "opacity") {

val*=100;

}

return parseFloat(val);

}

if(attr == "opacity") {

el.style.opacity = val/100;

el.style.filter = "alpha(opacity = "+val+")";

} else {

el.style[attr] = val + "px";

}

}

/*动画Tween效果*/

function mTween(el,target,time,type,callBack) {

clearInterval(el.timer);

var t = 0;

var b = {};

var c = {};

var d = time/20;

for(var s in target) {

b[s] = css(el,s);

c[s] = target[s] - b[s];

}

el.timer = setInterval(function(){

t++;

if(t>d) {

clearInterval(el.timer);

/*if(callBack) {

callBack()

}*/

callBack&&callBack(); //回调函数 动画执行完了以后,要执行的内容 ,类型 function

} else {

for(var s in target) {

var val = Tween[type](t,b[s],c[s],d);

css(el,s,val);

}

}

},20);

}

/*

t:执行至第几次

b:起始值

c:差值(目标点和起始值的差值)

d:执行总次数

return本次应该在的位置

linear匀速

easeIn加速

easeOut减速

easeBoth先加速后减速

easeInStrong二次方加速

easeOutStrong二次方减速

easeBothStrong二次方先加速后减速

elasticIn弹性在开始方向

elasticout弹性在结束方向

elasticBoth弹性开始和结束都有

backIn回弹在开始方向

backOut回弹在结束方向

backBoth回弹开始和结束都有

bounceIn碰撞在开始方向

bounceOut碰撞在结束方向

bounceBoth碰撞开始和结束都有

*/

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