JavaScript

超轻量级php框架startmvc

js学习心得_一个简单的动画库封装tween.js

更新时间:2020-05-24 13:30:01 作者:startmvc
具体代码如下:~function(){varmyEffect={Linear:function(t,b,c,d){returnc*t/d+b},Quad:{//二次方的缓动(t^2

具体代码如下:


~function(){
 var myEffect = {
 Linear:function(t,b,c,d){
 return c*t/d+b
 },
 Quad: {//二次方的缓动(t^2);
 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: {//三次方的缓动(t^3)
 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: {//四次方的缓动(t^4);
 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: {//5次方的缓动(t^5);
 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: {//正弦曲线的缓动(sin(t))
 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: {//指数曲线的缓动(2^t);
 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: {//圆形曲线的缓动(sqrt(1-t^2));
 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: {//指数衰减的正弦曲线缓动;
 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: {//超过范围的三次方缓动((s+1)*t^3 - s*t^2);
 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;
 }
 },
 zfBounce: {//指数衰减的反弹缓动。
 easeIn: function(t,b,c,d){
 return c - zhufengEffect.zfBounce.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 zhufengEffect.zfBounce.easeIn(t*2, 0, c, d) * .5 + b;
 else return zhufengEffect.zfBounce.easeOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
 }
 }
 };
 //move:实现多方向的运动动画
 /*
 curEle:当前要运动的元素
 target:当前动画的目标位置,存储的是每一个方向的目标位置{left:xxx,top:xxx...}
 duration:当前动画的总时间
 */
 //effect支持以下的情况
 /*
 
 */
 function move(curEle,target,duration,effect,callback){
 //处理我们需要的动画效果
 var tempEffect = myEffect.Linear;
 if(typeof effect === "number"){
 switch(effect){
 case 0:
 tempEffect = myEffect.Linear;
 break;
 case 1:
 tempEffect = myEffect.Circ.easeInOut;
 break;
 case 2:
 tempEffect = myEffect.Elastic.easeOut;
 break;
 case 3:
 tempEffect = myEffect.Back.easeOut;
 break;
 case 4:
 tempEffect = myEffect.Bounce.easeOut;
 break;
 case 5:
 tempEffect = myEffect.Expo.easeIn;
 }
 }else if(effect instanceof Array){
 tempEffect = effect.length>=2 ? myEffect[effect[0]][effect[1]] : myEffect[effect[0]]
 }else if(typeof effect === "function"){
 //我们的实际意义应该是:effect是不传递值的,传递进来的函数应该是回调函数的值
 callback = effect;
 }

 //在每一次执行方法之前,首先把当前元素之前正在运行的动画结束掉
 window.clearInterval(curEle.timer);
 //根据target获取每一个方向的起始值begin和总距离change
 var begin = {},change = {};
 for(var key in target){
 if(target.hasOwnProperty(key)){
 begin[key] = utils.css(curEle,key)
 change[key] = target[key] - begin[key];

 }
 }
 //实现多方向的运动动画
 var time = 0;
 curEle.timer = window.setInterval(function(){
 time+=10;
 //到达目标:结束动画,让当前元素的样式值等于目标样式值
 if(time>=duration){
 utils.css(curEle,target);
 window.clearInterval(curEle.timer);
 //在动画结束的时候,如果用户把回调函数传递给我了,我就把用户传递的回调函数执行,不仅执行还把this的指向改为当前操作的元素

 typeof callback === "function" ? callback.call(curEle) : null;
 //或者callback && callback()
 return;
 }
 //没到达目标:分别获取每一个方向的当前位置,给当前位置设置样式即可。
 for(var key in target){
 if(target.hasOwnProperty(key)){
 var curPos = tempEffect(time,begin[key],change[key],duration);
 utils.css(curEle,key,curPos);
 }
 }
 },10)
 }

 window.myAnimate = move;
}()

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tween.js 动画库