javascript 自定义动画函数
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<head>
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<title>自定义动画DEMO</title> <script src="http://files.cnblogs.com/siqi/jquery-1.4.4.js"></script> <script src="http://files.cnblogs.com/siqi/jquery.easing.1.3.js"></script>
<script> var Tween = {
Linear:function (start,alter,curTime,dur) {return start+curTime/dur*alter;},//最简单的线性变化,即匀速运动
Quad:{//二次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,2)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,2)-2*progress)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,2):-((--progress)*(progress-2) - 1))*alter/2+start;
}
},
Cubic:{//三次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,3)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,3)-Math.pow(progress,2)+1)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,3):((progress-=2)*Math.pow(progress,2) + 2))*alter/2+start;
}
},
Quart:{//四次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,4)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,4)-Math.pow(progress,3)-1)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,4):-((progress-=2)*Math.pow(progress,3) - 2))*alter/2+start;
}
},
Quint:{//五次方缓动
easeIn:function (start,alter,curTime,dur) {
return start+Math.pow(curTime/dur,5)*alter;
},
easeOut:function (start,alter,curTime,dur) {
var progress =curTime/dur;
return start-(Math.pow(progress,5)-Math.pow(progress,4)+1)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?Math.pow(progress,5):((progress-=2)*Math.pow(progress,4) +2))*alter/2+start;
}
},
Sine :{//正弦曲线缓动
easeIn:function (start,alter,curTime,dur) {
return start-(Math.cos(curTime/dur*Math.PI/2)-1)*alter;
},
easeOut:function (start,alter,curTime,dur) {
return start+Math.sin(curTime/dur*Math.PI/2)*alter;
},
easeInOut:function (start,alter,curTime,dur) {
return start-(Math.cos(curTime/dur*Math.PI/2)-1)*alter/2;
}
},
Expo: {//指数曲线缓动
easeIn:function (start,alter,curTime,dur) {
return curTime?(start+alter*Math.pow(2,10*(curTime/dur-1))):start;
},
easeOut:function (start,alter,curTime,dur) {
return (curTime==dur)?(start+alter):(start-(Math.pow(2,-10*curTime/dur)+1)*alter);
},
easeInOut:function (start,alter,curTime,dur) {
if (!curTime) {return start;}
if (curTime==dur) {return start+alter;}
var progress =curTime/dur*2;
if (progress < 1) {
return alter/2*Math.pow(2,10* (progress-1))+start;
} else {
return alter/2* (-Math.pow(2, -10*--progress) + 2) +start;
}
}
},
Circ :{//圆形曲线缓动
easeIn:function (start,alter,curTime,dur) {
return start-alter*Math.sqrt(-Math.pow(curTime/dur,2));
},
easeOut:function (start,alter,curTime,dur) {
return start+alter*Math.sqrt(1-Math.pow(curTime/dur-1));
},
easeInOut:function (start,alter,curTime,dur) {
var progress =curTime/dur*2;
return (progress<1?1-Math.sqrt(1-Math.pow(progress,2)):(Math.sqrt(1 - Math.pow(progress-2,2)) + 1))*alter/2+start;
}
},
Elastic: {//指数衰减的正弦曲线缓动
easeIn:function (start,alter,curTime,dur,extent,cycle) {
if (!curTime) {return start;}
if ((curTime==dur)==1) {return start+alter;}
if (!cycle) {cycle=dur*0.3;}
var s;
if (!extent || extent< Math.abs(alter)) {
extent=alter;
s = cycle/4;
} else {s=cycle/(Math.PI*2)*Math.asin(alter/extent);}
return start-extent*Math.pow(2,10*(curTime/dur-1)) * Math.sin((curTime-dur-s)*(2*Math.PI)/cycle);
},
easeOut:function (start,alter,curTime,dur,extent,cycle) {
if (!curTime) {return start;}
if (curTime==dur) {return start+alter;}
if (!cycle) {cycle=dur*0.3;}
var s;
if (!extent || extent< Math.abs(alter)) {
extent=alter;
s =cycle/4;
} else {s=cycle/(Math.PI*2)*Math.asin(alter/extent);}
return start+alter+extent*Math.pow(2,-curTime/dur*10)*Math.sin((curTime-s)*(2*Math.PI)/cycle);
},
easeInOut:function (start,alter,curTime,dur,extent,cycle) {
if (!curTime) {return start;}
if (curTime==dur) {return start+alter;}
if (!cycle) {cycle=dur*0.45;}
var s;
if (!extent || extent< Math.abs(alter)) {
extent=alter;
s =cycle/4;
} else {s=cycle/(Math.PI*2)*Math.asin(alter/extent);}
var progress = curTime/dur*2;
if (progress<1) {
return start-0.5*extent*Math.pow(2,10*(progress-=1))*Math.sin( (progress*dur-s)*(2*Math.PI)/cycle);
} else {
return start+alter+0.5*extent*Math.pow(2,-10*(progress-=1)) * Math.sin( (progress*dur-s)*(2*Math.PI)/cycle);
}
}
},
Back:{
easeIn: function (start,alter,curTime,dur,s){
if (typeof s == "undefined") {s = 1.70158;}
return start+alter*(curTime/=dur)*curTime*((s+1)*curTime - s);
},
easeOut: function (start,alter,curTime,dur,s) {
if (typeof s == "undefined") {s = 1.70158;}
return start+alter*((curTime=curTime/dur-1)*curTime*((s+1)*curTime + s) + 1);
},
easeInOut: function (start,alter,curTime,dur,s){
if (typeof s == "undefined") {s = 1.70158;}
if ((curTime/=dur/2) < 1) {
return start+alter/2*(Math.pow(curTime,2)*(((s*=(1.525))+1)*curTime- s));
}
return start+alter/2*((curTime-=2)*curTime*(((s*=(1.525))+1)*curTime+ s)+2);
}
},
Bounce:{
easeIn: function(start,alter,curTime,dur){
return start+alter-Tween.Bounce.easeOut(0,alter,dur-curTime,dur);
},
easeOut: function(start,alter,curTime,dur){
if ((curTime/=dur) < (1/2.75)) {
return alter*(7.5625*Math.pow(curTime,2))+start;
} else if (curTime < (2/2.75)) {
return alter*(7.5625*(curTime-=(1.5/2.75))*curTime + .75)+start;
} else if (curTime< (2.5/2.75)) {
return alter*(7.5625*(curTime-=(2.25/2.75))*curTime + .9375)+start;
} else {
return alter*(7.5625*(curTime-=(2.625/2.75))*curTime + .984375)+start;
}
},
easeInOut: function (start,alter,curTime,dur){
if (curTime< dur/2) {
return Tween.Bounce.easeIn(0,alter,curTime*2,dur) *0.5+start;
} else {
return Tween.Bounce.easeOut(0,alter,curTime*2-dur,dur) *0.5 + alter*0.5 +start;
}
}, easeOutBounce: function (b, c, t, 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;
}
}
},
//start,alter,curTime,dur
easeOutBounce: function (b, c, t, 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;
}
}
}; jQuery(function($){ //两种动画方式对比，在w3c浏览器中是一致的，在IE中有差异（即使用同算法）
$("#start").click(function(){ //自定义动画函数
animate(Fid("song"), {opacity:0.3, left:400}, 2000, Tween.easeOutBounce); //jq动画效果
$("#jian").animate( {opacity:0.3, left:400}, 2000, 'easeOutBounce') }) /*
参数说明
o:要动画的对象
end:元素最终的样式
dur:动画持续多长时
fx:效果插件
*/
function animate(o ,end, dur, fx) { var curTime=0;
var start = {};//元素的初始样式
var alter = {};//元素的增量样式 var t=setInterval(function () {
if (curTime>=dur) clearTimeout(t);
for (var i in end) { if(! (i in start))//注意加括号
{
//不能用 parseInt.有透明度时会出问题
start[i] = parseFloat(getStyle(o, i));
} if(! (i in alter))
{
alter[i] = end[i] - start[i];
} var val = fx(start[i],alter[i],curTime,dur); if(i == 'opacity')
{
/**
o.style.filter, o.style.opacity 火狐下都为空字符串
只能用 o.style.opacity 检测
注意：ietester下无法测试透明度
*/
if(typeof o.style.opacity == "undefined")
{
o.style.filter = "alpha(opacity="+val*100+")";
}else{ o.style[i] = val;
}
}else{
o.style[i] = val+'px';
}
}
curTime+=13; //jquery 中也为 13 },13);
} /**
获取元素样式
处理透明度、元素浮动样式的获取 ，结果带有单位
*/
function getStyle(elem, name) {
var nameValue = null;
if (document.defaultView) {
var style = document.defaultView.getComputedStyle(elem, null);
nameValue = name in style ? style[name] : style.getPropertyValue(name);
} else {
var style = elem.style,
curStyle = elem.currentStyle;
//透明度 from youa
if (name == "opacity") {
if (/alpha\(opacity=(.*)\)/i.test(curStyle.filter)) {
var opacity = parseFloat(RegExp.$1); return opacity ? opacity / 100 : 0;
}
return 1;
}
if (name == "float") {
name = "styleFloat";
}
var ret = curStyle[name] || curStyle[camelize(name)];
//单位转换 from jqury
if (!/^-?\d+(?:px)?$/i.test(ret) && /^\-?\d/.test(ret)) {
var left = style.left,
rtStyle = elem.runtimeStyle,
rsLeft = rtStyle.left; rtStyle.left = curStyle.left;
style.left = ret || 0;
ret = style.pixelLeft + "px"; style.left = left;
rtStyle.left = rsLeft;
} nameValue = ret;
} return nameValue === 'auto' ? '0px' : nameValue;
} function camelize(s) {//将CSS属性名转换成驼峰式
return s.replace(/-[a-z]/gi,function (c) {
return c.charAt(1).toUpperCase();
});
} function Fid(id)
{
return document.getElementById(id);
} }) </script>
</head>
<style> .main{ border:1px solid blue; height:350px;} .pos {position:absolute; left:0px;top:50px; border:5px solid red; background:green;width:100px; height:100px;} </style>
<body> <div class="main">
<div id="song" class="pos" style="display:block;">song</div>
<div id="jian" class="pos" style="top:200px;">jian</div>
</div> <button id="start">start</button> </body>
</html>
效果图：
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