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JavaScript实现一个很轻量的动画库效果

来源：程序员人生发布时间：2014-02-27 18:45:33 阅读次数：2634次

JS动画，实质是对DOM样式的改变。只要把主流浏览器DOM元素的属性方法搞清楚，做JS动画并不算难。网上也有很多封装好的JS动画库，但大多因为功能过于完善，而至于代码量大动辄过千行，不宜在小项目中使用。这里自己封装了一个很轻量的动画库，主要功能都已实现。难免有疏漏之处，还请大家多多指教。

这里先说明一下功能和用法，以及注意点，随后是一个很简单的可运行示例。

用法及注意事项：
anim(elemId, cssObj, time, animType, funObj)
参数说明：
elemId （必选）需要施加动画效果的元素id
cssObj （必选）动画结束时的样式，对象类型，键值对形式，
其中键是能直接用在JS中的“驼峰”形式的css属性，而不是原来的css属性。
例如：{ marginLeft: '200px', top: '200px', borderWidth: '8px'}
time （必选）动画持续时间（单位ms）
animType （可选）默认为线性变化，代码里的Tween类型包含可选的其他参数
funObj （可选）如果要此选项，需要加入开始和结束时候执行的函数。
形如：{ el为elemId所指向的元素
start: function (el) { el.innerHTML = 'start!'; },
complete: function (el) { el.innerHTML = 'Completed!'; }
}

几点注意事项：
1、没有做低版本浏览器兼容，支持IE8+、FF、chrome、safari、opera
2、注意用能直接用在JS中的“驼峰”形式的css属性（本来应把css转“驼峰”形式，
但是基本所有JS程序员都能直接写出驼峰形式，所以没转）
3、如果需要把动画应用到绝对定位（position:absolute;）元素上，
需要注意在这些元素上设置CSS的方法。
例如：设置top和marginTop，对于绝对定位元素，应该设置top而不是marginTop，
更不应该将二者混合使用，因为二者的参考点是不一样的，同时设置很容易造成混乱。
所以，这里也不支持同时设置二者。
其他相似的同理（left和marginLeft、right和marginRight）
同时设置top和bottom、left和right也不支持。
4、引用了Tween缓动算法，支持线性、渐入渐出等多种变化方式。
5、“动画队列”功能尚未实现，此版本为初级版本，疏漏之处还请多多指正。

<!DOCTYPE HTML><html><head><title></title><style type="text/css">#container{ border:1px solid #000; width:500px; height:400px;}#aa{ border:1px solid #000; width:100px; height:40px; background-color:#0f0;position:absolute; left:50px; top:50px; }#bb{ border:1px solid #000; width:500px; height:40px; margin-top:100px;}#cc{ border:1px solid #000; width:500px; height:40px;}</style></head><body><div id="container"><input id="Abegin" type="button" value="开始" /><input id="Apause" type="button" value="暂停" /><input onclick="location.reload()" type="button" value="刷新网页" /><div id="aa"><br /></div><div id="bb">dfdfddfsd</div><div id="cc">gregreger</div></div><script type="text/javascript">(function () {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 color = {sub: function (str, start, len) {if (len) return str.substring(start, start + len);else return str.substring(start);},hex: function (i) { // 返回16进制颜色表示if (i < 0) return "00";else if (i > 255) return "ff";else { var str = "0" + i.toString(16); return str.substring(str.length - 2); }},//获取颜色数据GetColors: function (sColor) {sColor = sColor.replace("#", "");var r, g, b;if (sColor.length > 3) {r = color.sub(sColor, 0, 2); g = color.sub(sColor, 2, 2); b = color.sub(sColor, 4, 2);} else {r = color.sub(sColor, 0, 1); g = color.sub(sColor, 1, 1); b = color.sub(sColor, 2, 1);r += r; g += g; b += b;}return [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16)];}}var fn = {getElement: function (id) {return typeof id == "string" ? document.getElementById(id) : id;},objType: function (obj) {switch (Object.prototype.toString.call(obj)) {case "[object Object]":return "Object";case "[object Number]":return "Number";case "[object Array]":return "Array";}},getStyle: function (elem, name) { //var w3style;if (document.defaultView) {var style = document.defaultView.getComputedStyle(elem, null);name == "borderWidth" ? name = "borderLeftWidth" : name; // 解决标准浏览器解析问题w3style = name in style ? style[name] : style.getPropertyValue(name);w3style == "auto" ? w3style = "0px" : w3style;}return elem.style[name] ||(elem.currentStyle && (elem.currentStyle[name] == "auto" ? "0px" : elem.currentStyle[name])) || w3style;},getOriCss: function (elem, cssObj) { // 此处只能获取属性值为数值类型的style属性var cssOri = [];for (var prop in cssObj) {if (!cssObj.hasOwnProperty(prop)) continue;//if (prop != "opacity") cssOri.push(parseInt(fn.getStyle(elem, prop)));//else cssOri.push(100 * fn.getStyle(elem, prop));if (fn.getStyle(elem, prop) == "transparent" || /^#|rgb(/.test(fn.getStyle(elem, prop))) {if (fn.getStyle(elem, prop) == "transparent") {cssOri.push([255, 255, 255]);}if (/^#/.test(fn.getStyle(elem, prop))) {cssOri.push(color.GetColors(fn.getStyle(elem, prop)));}if (/^rgb(/.test(fn.getStyle(elem, prop))) {//cssOri.push([fn.getStyle(elem, prop).replace(/^rgb()/g, "")]);var regexp = /^rgb(([0-9]{0,3}),s([0-9]{0,3}),s([0-9]{0,3}))/g;var re = fn.getStyle(elem, prop).replace(regexp, "$1 $2 $3").split(" ");//cssOri.push(re); // re为字符串数组cssOri.push([parseInt(re[0]), parseInt(re[1]), parseInt(re[2])]);}} else if (prop == "opacity") {cssOri.push(100 * fn.getStyle(elem, prop));} else {cssOri.push(parseInt(fn.getStyle(elem, prop)));}}return cssOri;},getEndCss: function (cssobj) {var cssEnd = [];for (var prop in cssobj) {if (!cssobj.hasOwnProperty(prop)) continue;//if (prop != "opacity") cssEnd.push(parseInt(cssobj[prop]));//else cssEnd.push(100 * cssobj[prop]);if (prop == "opacity") {cssEnd.push(100 * cssobj[prop]);} else if (/^#/.test(cssobj[prop])) {cssEnd.push(color.GetColors(cssobj[prop]));} else {cssEnd.push(parseInt(cssobj[prop]));}}return cssEnd;}}function _anim(/*elemId, cssObj, time, animType, funObj*/) {this.init.apply(this, arguments[0]);}_anim.prototype = {init: function () {this.elem = fn.getElement(arguments[0]);this.cssObj = arguments[1];this.cssOri = fn.getOriCss(this.elem, arguments[1]);this.cssEnd = fn.getEndCss(arguments[1]);this.durtime = arguments[2];this.animType = "Tween.Linear";this.funObj = null;this.start = false;this.complete = false;this.onPause = false;this.onRestart = false;if (arguments.length < 3) {throw new Error("至少要传入3个参数");} else if (arguments.length == 4) {if (fn.objType(arguments[3]) == "Object") {this.funObj = arguments[3];for (var p in this.funObj) {if (p.toString() == "start") this.start = true;if (p.toString() == "complete") this.complete = true;}}if (typeof (arguments[3]) == "string") {this.animType = arguments[3];}} else if (arguments.length == 5) {this.animType = arguments[3];if (fn.objType(arguments[4]) == "Object") {this.funObj = arguments[4];for (var p in this.funObj) {if (p.toString() == "start") this.start = true;if (p.toString() == "complete") this.complete = true;}}}this.startAnim();},startAnim: function () {if (this.start) this.funObj["start"].call(this, this.elem);var that = this;var t = 0;var props = [];for (var pro in this.cssObj) {if (!this.cssObj.hasOwnProperty(pro)) continue;props.push(pro);}var tt = new Date().getTime();clearInterval(this.timer);this.timer = setInterval(function () {if (that.onPause) {clearInterval(that.timer);return;}if (t < that.durtime / 10) {t++;for (var i = 0; i < props.length; i++) {var b, c;fn.objType(that.cssOri[i]) != "Array" && (b = that.cssOri[i]); //开始值fn.objType(that.cssEnd[i]) != "Array" && (c = that.cssEnd[i] - that.cssOri[i]); // 变化量var d = that.durtime / 10; // 持续时间if (fn.objType(that.cssOri[i]) == "Array" && fn.objType(that.cssEnd[i]) == "Array") {var b1 = that.cssOri[i][0], b2 = that.cssOri[i][1], b3 = that.cssOri[i][2];var c1 = that.cssEnd[i][0] - that.cssOri[i][0],c2 = that.cssEnd[i][1] - that.cssOri[i][1],c3 = that.cssEnd[i][2] - that.cssOri[i][2];var r = color.hex(Math.ceil((eval(that.animType))(t, b1, c1, d))),g = color.hex(Math.ceil((eval(that.animType))(t, b2, c2, d))),b = color.hex(Math.ceil((eval(that.animType))(t, b3, c3, d)));that.elem.style[props[i]] = "#" + r + g + b;} else if (props[i].toString() == "opacity") {that.elem.style[props[i]] = Math.ceil((eval(that.animType))(t, b, c, d)) / 100;} else {that.elem.style[props[i]] = Math.ceil((eval(that.animType))(t, b, c, d)) + "px";}}} else {for (var i = 0; i < props.length; i++) {if (fn.objType(that.cssOri[i]) == "Array" && fn.objType(that.cssEnd[i]) == "Array") {var c1 = that.cssEnd[i][0],c2 = that.cssEnd[i][1],c3 = that.cssEnd[i][2];var r = color.hex(Math.ceil((eval(that.animType))(t, b1, c1, d))),g = color.hex(Math.ceil((eval(that.animType))(t, b2, c2, d))),b = color.hex(Math.ceil((eval(that.animType))(t, b3, c3, d)));that.elem.style[props[i]] = "#" + r + g + b;} else if (props[i].toString() == "opacity") {that.elem.style[props[i]] = that.cssEnd[i] / 100;} else {that.elem.style[props[i]] = that.cssEnd[i] + "px";}}clearInterval(that.timer);if (that.complete) that.funObj["complete"].call(that, that.elem);//alert(new Date().getTime() - tt);}}, 10); // 一般要给10毫秒异步调用时间，不能是1},pause: function () {this.onPause = true;}}window.anim = function () {return new _anim(arguments);}})();</script><script type="text/javascript">var bbtn = document.getElementById("Abegin"),pbtn = document.getElementById("Apause");var a;bbtn.onclick = function () {a = anim("aa", {left: '200px',top: '200px',width: '200px',height: '200px',backgroundColor: '#f00',borderWidth: '8px'}, 4000, 'Tween.Bounce.easeInOut', {start: function (el) { el.innerHTML = 'start!'; },complete: function (el) { el.innerHTML = 'Completed!'; }});}pbtn.onclick = function () {a.pause();}anim("bb", {marginTop:'160px',opacity:0.1,width: '200px',height: '200px',borderWidth: '8px'}, 2000, 'Tween.Bounce.easeIn', {start: function (el) { el.innerHTML = 'start!'; },complete: function (el) { el.innerHTML = 'Completed!'; }});</script></body></html><div style="text-align:center;margin:30px 0 0 0;"><hr style="color:#999;height:1px;">如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.wfuyu.com/' target='_blank'>http://www.wfuyu.com/</a></div>
提示：可修改后代码再运行!

（来源：http://huajs.cnblogs.com）

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