JavaScript实现的Tween算法及缓冲特效实例代码

2019-11-20 11:21:06

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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.VeVB.COm/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) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b; }, easeOut: function(t,b,c,d){  return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b; }, easeInOut: function(t,b,c,d){  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(t,b,c,d){  return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b; }, easeOut: function(t,b,c,d){  return c * Math.sqrt(1 - (t=t/d-1)*t) + b; }, easeInOut: function(t,b,c,d){  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(t,b,c,d,a,p){  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(t,b,c,d,a,p){  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(t,b,c,d,a,p){  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(t,b,c,d,s){  if (s == undefined) s = 1.70158;  return c*(t/=d)*t*((s+1)*t - s) + b; }, easeOut: function(t,b,c,d,s){  if (s == undefined) s = 1.70158;  return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b; }, easeInOut: function(t,b,c,d,s){  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(t,b,c,d){  return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b; }, easeOut: 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 + .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(t,b,c,d){  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 $ = function (id) { return "string" == typeof id ? document.getElementById(id) : id;};var Each = function(list, fun){ for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }};var fun, iChart = 550, iDuration = 100;function Move(){ var oM = $("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>'); } $("idChart").innerHTML = a.join("");}var arrTween = document.getElementsByName("vTween");var arrEase = document.getElementsByName("vEase");Each(arrTween, function(o){ o.onclick = function(){ SetFun(); Chart(); } })Each(arrEase, function(o){ o.onclick = function(){ SetFun(); Chart(); } })function SetFun(){ var sTween, sEase; Each(arrTween, function(o){ if(o.checked){ sTween = o.value; } }) Each(arrEase, function(o){ if(o.checked){ sEase = o.value; } }) fun = sTween == "Linear" ? Tween.Linear : Tween[sTween][sEase];}$("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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