javascript 自定义动画函数
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<!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="http://files.cnblogs.com/siqi/jquery-1.4.4.js"></script><script src="http://files.cnblogs.com/siqi/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> 1 0
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