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Algoritma tween dan kod contoh kesan penimbalan dilaksanakan dalam kemahiran JavaScript_javascript

WBOY
WBOYasal
2016-05-16 15:33:501149semak imbas

Contoh dalam artikel ini menerangkan algoritma Tween dan kesan penimbalan yang dilaksanakan dalam JavaScript. Kongsikan dengan semua orang untuk rujukan anda, butirannya adalah seperti berikut:

Berikut ialah demonstrasi algoritma Tween dan kod JavaScript untuk menimbal kesan khas Anda boleh menggunakannya untuk mencipta banyak kesan animasi seperti pelonggaran dan pegas Cara menggunakan algoritma Tween bagi membuat algoritma Tween bagi js dan gunakannya untuk melakukan beberapa perkara mudah Bagi kesan pelonggaran, anda akan memahaminya selepas membaca kod ini.

Tangkapan skrin kesan berjalan adalah seperti berikut:

Alamat demo dalam talian adalah seperti berikut:

http://demo.jb51.net/js/2015/js-tween-run-style-codes/

Kod khusus adalah seperti berikut: 

<!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) &#63; b : c * Math.pow(2, 10 * (t/d - 1)) + b;
 },
 easeOut: function(t,b,c,d){
  return (t==d) &#63; 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 &#63; 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" &#63; 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>

Saya harap artikel ini akan membantu semua orang dalam pengaturcaraan JavaScript.

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