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jQuery自定义动画函数实例详解(附demo源码)

本文实例讲述了jQuery自定义动画函数完整实现技巧。分享给大家供大家参考，具体如下：

运行效果截图如下：

在线演示地址如下：

http://demo.jb51.net/js/2015/jquery-zdy-dh-move-style-demo/

具体代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>自定义动画DEMO</title>
<script src="jquery-1.4.4.js"></script>
<script src="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>

完整实例代码点击此处本站下载。

希望本文所述对大家JavaScript程序设计有所帮助。

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