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本文实例讲述了JavaScript实现的Tween算法及缓冲特效。分享给大家供大家参考，具体如下：
这里演示Tween 算法及缓冲特效的JavaScript代码，利用它可以做缓动、弹簧等很多动画效果，怎么利用flash的Tween类的算法，来做js的Tween算法，并利用它做一些简单的缓动效果呢，看懂了本代码你就明白了。
运行效果截图如下：
在线演示地址如下：
http://demo.jb51.net/js/2015/js-tween-run-style-codes/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Tween</title>
</head>
<body>
<div style="padding-left:50px;">
<div style="position:relative; border:1px solid #000000; width:550px; height:50px;">
<div id="idMove" style="width:50px; height:50px; background:#930; position:absolute;"></div>
</div>
<div style="position:relative;width:550px;height:200px; margin-top:50px;">
<div id="idChart" style="border:1px solid #000;height:200px;"> </div>
<div id="idLine" style="position:absolute;top:0;left:0;height:200px;width:1px;background:#000;"></div>
</div>
</div>
<div>
<p> Tween类型： <br />
<label>
<input name="vTween" type="radio" value="Linear" checked="checked" />
Linear </label>
<label>
<input name="vTween" type="radio" value="Quad" />
Quadratic </label>
<label>
<input name="vTween" type="radio" value="Cubic" />
Cubic </label>
<label>
<input name="vTween" type="radio" value="Quart" />
Quartic </label>
<label>
<input name="vTween" type="radio" value="Quint" />
Quintic </label>
<label>
<input name="vTween" type="radio" value="Sine" />
Sinusoidal </label>
<br />
<label>
<input name="vTween" type="radio" value="Expo" />
Exponential </label>
<label>
<input name="vTween" type="radio" value="Circ" />
Circular </label>
<label>
<input name="vTween" type="radio" value="Elastic" />
Elastic </label>
<label>
<input name="vTween" type="radio" value="Back" />
Back </label>
<label>
<input name="vTween" type="radio" value="Bounce" />
Bounce </label>
</p>
<p> ease类型： <br />
<label>
<input name="vEase" type="radio" value="easeIn" checked="checked" />
easeIn </label>
<label>
<input name="vEase" type="radio" value="easeOut" />
easeOut </label>
<label>
<input name="vEase" type="radio" value="easeInOut" />
easeInOut </label>
</p>
<input id="idSpeed" type="button" value="减慢速度" />
<input id="idRun" type="button" value=" Run " />
</div>
<script>
var Tween = {
Linear: function(t,b,c,d){ return c*t/d + b; },
Quad: {
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;
},
easeInOut: function(t,b,c,d){
if ((t/=d/2) < 1) return c/2*t*t + b;
return -c/2 * ((--t)*(t-2) - 1) + b;
}
},
Cubic: {
easeIn: function(t,b,c,d){
return c*(t/=d)*t*t + b;
},
easeOut: function(t,b,c,d){
return c*((t=t/d-1)*t*t + 1) + b;
},
easeInOut: 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;
}
},
Quart: {
easeIn: function(t,b,c,d){
return c*(t/=d)*t*t*t + b;
},
easeOut: function(t,b,c,d){
return -c * ((t=t/d-1)*t*t*t - 1) + b;
},
easeInOut: 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;
}
},
Quint: {
easeIn: function(t,b,c,d){
return c*(t/=d)*t*t*t*t + b;
},
easeOut: function(t,b,c,d){
return c*((t=t/d-1)*t*t*t*t + 1) + b;
},
easeInOut: 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;
}
},
Sine: {
easeIn: function(t,b,c,d){
return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
},
easeOut: function(t,b,c,d){
return c * Math.sin(t/d * (Math.PI/2)) + b;
},
easeInOut: function(t,b,c,d){
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
}
},
Expo: {
easeIn: function(t,b,c,d){
return (t==0) "string" == typeof id "idMove").style, oL = $("idLine").style, t=0, c=500, d=iDuration;
oM.left=oL.left="0px"; clearTimeout(Move._t);
function _run(){
if(t<d){
t++;
oM.left = Math.ceil(fun(t,0,c,d)) + "px";
oL.left = Math.ceil(Tween.Linear(t,0,iChart,d)) + "px";
Move._t = setTimeout(_run, 10);
}else{
oM.left = c + "px";
oL.left = iChart + "px";
}
}
_run();
}
function Chart(){
var a = [];
for (var i = 0; i < iChart; i++) {
a.push('<div style="background-color:#f60;font-size:0;width:3px;height:3px;position:absolute;left:' + (i-1) + 'px;top:' + (Math.ceil(fun(i,200,-200,iChart))) + 'px;"><\/div>');
}
$("idChart").innerHTML = a.join("");
}
var arrTween = document.getElementsByName("vTween");
var arrEase = document.getElementsByName("vEase");
Each(arrTween, function(o){ o.onclick = function(){ SetFun(); Chart(); } })
Each(arrEase, function(o){ o.onclick = function(){ SetFun(); Chart(); } })
function SetFun(){
var sTween, sEase;
Each(arrTween, function(o){ if(o.checked){ sTween = o.value; } })
Each(arrEase, function(o){ if(o.checked){ sEase = o.value; } })
fun = sTween == "Linear" "idRun").onclick = function(){ SetFun(); Chart(); Move(); }
$("idSpeed").onclick = function(){
if(iDuration == 100){
iDuration = 500; this.value = "加快速度";
}else{
iDuration = 100; this.value = "减慢速度";
}
}
</script>
</body>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。
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