本文實例講述了JavaScript實現的Tween算法及緩沖特效。分享給大家供大家參考，具體如下：
這里演示Tween 算法及緩沖特效的JavaScript代碼，利用它可以做緩動、彈簧等很多動畫效果，怎么利用flash的Tween類的算法，來做js的Tween算法，并利用它做一些簡單的緩動效果呢，看懂了本代碼你就明白了。
運行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-tween-run-style-codes/
具體代碼如下：
<!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類型： <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類型： <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="減慢速度" /> <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 = "減慢速度"; }}</script></body></html>希望本文所述對大家JavaScript程序設計有所幫助。
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