算法用的是Tween类，需要研究的参考这篇文章:
http://www.cnblogs.com/cloudgamer/archive/2009/01/06/Tween.html
网页里常用的动画 放大缩小 位置移动 透明度改变
效果预览：http://jsfiddle.net/dtdxrk/WnACG/embedded/result/
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>原生Js封装的动画类</title>
<style type="text/css">
*{margin: 0;padding: 0}
input {padding: 5px 10px;} #content{margin:10px;width:100px;height:100px;border: 5px solid #666;text-align: center; opacity: 1; filter: alpha(opacity=100);}
#content h1{background-color: #666;color: #fff;text-align: center;margin:10px;} </style>
</head> <body>
<input type="button" value="渐隐" onclick="Animation.alpha(_CalF.$('#content'),0);" />
<input type="button" value="渐显" onclick="Animation.alpha(_CalF.$('#content'),100);" />
<input type="button" value="位置移动" onclick="Animation.move(_CalF.$('#content'),{x:1000,y:500},Tween.Cubic.easeIn);" />
<input type="button" value="位置移动2" onclick="Animation.move(_CalF.$('#content'),{x:100,y:100},Tween.Cubic.easeOuth);" />
<input type="button" value="变大" onclick="Animation.size(_CalF.$('#content'),{w:500,h:500},Tween.Cubic.easeIn);" />
<input type="button" value="缩小" onclick="Animation.size(_CalF.$('#content'),{w:100,h:100},Tween.Cubic.easeOuth);" />
<input type="button" value="综合动画" onclick="Animation.alpha(_CalF.$('#content'),0);Animation.move(_CalF.$('#content'),{x:1000,y:500},Tween.Cubic.easeIn);Animation.size(_CalF.$('#content'),{w:500,h:500},Tween.Cubic.easeOuth);" />
<input type="button" value="综合动画2" onclick="Animation.alpha(_CalF.$('#content'),100);Animation.move(_CalF.$('#content'),{x:200,y:200},Tween.Cubic.easeIn);Animation.size(_CalF.$('#content'),{w:200,h:200},Tween.Cubic.easeOuth);" />
<div id="content">
<h1>动画类</h1>
</div> <script type="text/javascript">
var _CalF = {
$ : function(object){//选择器
if(object === undefined ) return;
var getArr = function(name,tagName,attr){
var tagName = tagName || '*',
eles = document.getElementsByTagName(tagName),
clas = (typeof document.body.style.maxHeight === "undefined") ? "className" : "class";//ie6
attr = attr || clas,
Arr = [];
for(var i=0;i<eles.length;i++){
if(eles[i].getAttribute(attr)==name){
Arr.push(eles[i]);
}
}
return Arr;
}; if(object.indexOf('#') === 0){ //#id
return document.getElementById(object.substring(1));
}else if(object.indexOf('.') === 0){ //.class
return getArr(object.substring(1));
}else if(object.match(/=/g)){ //attr=name
return getArr(object.substring(object.search(/=/g)+1),null,object.substring(0,object.search(/=/g)));
}else if(object.match(/./g)){ //tagName.className
return getArr(object.split('.')[1],object.split('.')[0]);
}
},
getPosition : function(obj) { //获取元素在页面里的位置和宽高
var top = 0,
left = 0,
width = obj.offsetWidth,
height = obj.offsetHeight; while(obj.offsetParent){
top += obj.offsetTop;
left += obj.offsetLeft;
obj = obj.offsetParent;
} return {"top":top,"left":left,"width":width,"height":height};
}
}; /*
t:currentCount 当前执行第t次
b:initPos 初始值
c:targetPos - initPos 发生偏移的距离值
d:count 一共执行d次
效果：http://www.robertpenner.com/easing/easing_demo.html
*/ var Tween = {
Linear: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * t / d + b;
},
Quad: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * (t /= d) * t + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return -c * (t /= d) * (t - 2) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
if ((t /= d / 2) < 1) return c / 2 * t * t + b;
return -c / 2 * ((--t) * (t - 2) - 1) + b;
}
},
Cubic: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * (t /= d) * t * t + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * ((t = t / d - 1) * t * t + 1) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
return c / 2 * ((t -= 2) * t * t + 2) + b;
}
},
Quart: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * (t /= d) * t * t * t + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
}
},
Quint: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * (t /= d) * t * t * t * t + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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;
}
},
Sine: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * Math.sin(t / d * (Math.PI / 2)) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
}
},
Expo: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return (t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return (t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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;
}
},
Circ: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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;
}
},
Elastic: {
easeIn: function(initPos, targetPos, currentCount, count, a, p) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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;
},
easeOut: function(initPos, targetPos, currentCount, count, a, p) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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);
},
easeInOut: function(initPos, targetPos, currentCount, count, a, p) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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;
}
},
Back: {
easeIn: function(initPos, targetPos, currentCount, count, s) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
if (s == undefined) s = 1.70158;
return c * (t /= d) * t * ((s + 1) * t - s) + b;
},
easeOut: function(initPos, targetPos, currentCount, count, s) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
if (s == undefined) s = 1.70158;
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
},
easeInOut: function(initPos, targetPos, currentCount, count, s) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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;
}
},
Bounce: {
easeIn: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
return c - Tween.Bounce.easeOut(d - t, 0, c, d) + b;
},
easeOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
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;
}
},
easeInOut: function(initPos, targetPos, currentCount, count) {
var b = initPos, c = targetPos - initPos, t = currentCount, d = count;
if (t < d / 2) return Tween.Bounce.easeIn(t * 2, 0, c, d) * .5 + b;
else return Tween.Bounce.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
}
}
} var Animation = {
timer : 10,
alphaPlay : "",
alpha : function(obj,value,Func){ //透明度
var that = this,
num = 0,
F,
init = document.all ? obj.filters.alpha.opacity : window.getComputedStyle(obj, null).opacity * 100; //获取元素的透明度
clearInterval(that.alphaPlay);
if(value<0){
value=0;
}else if(value>100){
value=100
}else{
value=value;
} Func = Func || Tween.Linear; that.alphaPlay = setInterval(function(){
if(num>100){
clearInterval(that.alphaPlay);
}else{
num++;
F = Func(init,value,num,100);
if (document.all) {
obj.filters.alpha.opacity = F;
obj.style.zoom =1;
}else {
obj.style.opacity = F / 100;
}
}
},that.timer);
},
movePlay : "",
move :function(obj,pos,Func){ //移动
var that = this,
elPos = _CalF.getPosition(obj),
initPos = {x:elPos.left, y:elPos.top},
num = 0,
_tempX,_tempY; clearInterval(that.movePlay);
Func = Func || Tween.Linear;
obj.style.position = "absolute"; that.movePlay = setInterval(function(){
if(num>100){
clearInterval(that.movePlay);
}else{
num++;
_tempX = Func(initPos.x, pos.x, num, 100);
_tempY = Func(initPos.y, pos.y, num, 100);
obj.style.left = _tempX +"px";
obj.style.top = _tempY +"px";
}
},that.timer);
},
sizePlay : "",
size : function(obj,pos,Func){ //改变大小
var that = this,
initPos = {w:obj.offsetWidth, h:obj.offsetHeight},
num = 0,
_tempW,_tempH;
clearInterval(that.sizePlay);
Func = Func || Tween.Linear; that.sizePlay = setInterval(function(){
if(num>100){
clearInterval(that.sizePlay);
}else{
num++;
_tempW = Func(initPos.w, pos.w, num, 100);
_tempH = Func(initPos.h, pos.h, num, 100);
obj.style.width = _tempW +"px";
obj.style.height = _tempH +"px";
}
},that.timer);
}
} </script>
</body>
</html>