JS时间板运动框架(Twnne)_tween js nan-优快云博客

本文链接：https://blog.youkuaiyun.com/babybk/article/details/51273350
本文介绍了一个使用纯CSS和JavaScript实现的动画效果案例。通过定义不同的缓动函数（如弹性、回退及弹跳等），实现了元素的平滑过渡效果。此案例展示了如何在不依赖第三方库的情况下，利用简单的HTML、CSS及JavaScript完成复杂的动画效果。
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        *{margin: 0;padding: 0;}
        #box{
            width: 100px;
            height: 100px;
            background: yellow;
            position: absolute;
            left: 30px;
        }
    </style>
</head>
<body>
    <div id="box"></div>
    <script type="text/javascript">
        var oBox = document.getElementById('box');

        var getStyle = function( obj , attr ){
            return obj.currentStyle?obj.currentStyle[attr]:getComputedStyle(obj)[attr];
        };

        var move = function (obj,arrt,time,cv,fn) {
            var This = this;
            var startTime = new Date();
            //var startVal = parseInt(getStyle(obj,arrt));
            var cv = cv?cv:"elasticOut";
            var startVal = {};
            for(var i in arrt){
                startVal[i] = parseInt( getStyle( obj , i ) );
            }

            var timer = setInterval(function () {
                var t = new Date() - startTime;     //动画运行多久了
                //var b = startVal;                   //初始值
                //var c = parseInt(target) - b;       //变化量
                var d = time;                       //持续时间

                if (t>=d){
                    t = d;
                    clearInterval(timer);
                    fn && fn.call( This );
                }

                for(var key in startVal){

                    var b = startVal[key];

                    var c = parseInt( arrt[key] ) - b;


                    var r = Tween[cv](t,b,c,d);

                    obj.style[key] = r + "px";
                }

            },13);
        };


        var Tween = {
            linear: function (t, b, c, d){  //匀速
                return c*t/d + b;
            },
            easeIn: function(t, b, c, d){  //加速曲线
                return c*(t/=d)*t + b;
            },
            easeOut: function(t, b, c, d){  //减速曲线
                return -c *(t/=d)*(t-2) + b;
            },
            easeBoth: function(t, b, c, d){  //加速减速曲线
                if ((t/=d/2) < 1) {
                    return c/2*t*t + b;
                }
                return -c/2 * ((--t)*(t-2) - 1) + b;
            },
            easeInStrong: function(t, b, c, d){  //加加速曲线
                return c*(t/=d)*t*t*t + b;
            },
            easeOutStrong: function(t, b, c, d){  //减减速曲线
                return -c * ((t=t/d-1)*t*t*t - 1) + b;
            },
            easeBothStrong: function(t, b, c, d){  //加加速减减速曲线
                if ((t/=d/2) < 1) {
                    return c/2*t*t*t*t + b;
                }
                return -c/2 * ((t-=2)*t*t*t - 2) + b;
            },
            elasticIn: function(t, b, c, d, a, p){  //正弦衰减曲线（弹动渐入）
                if (t === 0) {
                    return b;
                }
                if ( (t /= d) == 1 ) {
                    return b+c;
                }
                if (!p) {
                    p=d*0.3;
                }
                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;
            },
            elasticOut: function(t, b, c, d, a, p){    //正弦增强曲线（弹动渐出）
                if (t === 0) {
                    return b;
                }
                if ( (t /= d) == 1 ) {
                    return b+c;
                }
                if (!p) {
                    p=d*0.3;
                }
                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;
            },
            elasticBoth: function(t, b, c, d, a, p){
                if (t === 0) {
                    return b;
                }
                if ( (t /= d/2) == 2 ) {
                    return b+c;
                }
                if (!p) {
                    p = d*(0.3*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 - 0.5*(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 )*0.5 + c + b;
            },
            backIn: function(t, b, c, d, s){     //回退加速（回退渐入）
                if (typeof s == 'undefined') {
                    s = 1.70158;
                }
                return c*(t/=d)*t*((s+1)*t - s) + b;
            },
            backOut: function(t, b, c, d, s){
                if (typeof s == 'undefined') {
                    s = 3.70158;  //回缩的距离
                }
                return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
            },
            backBoth: function(t, b, c, d, s){
                if (typeof 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;
            },
            bounceIn: function(t, b, c, d){    //弹球减振（弹球渐出）
                return c - Tween['bounceOut'](d-t, 0, c, d) + b;
            },
            bounceOut: 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 + 0.75) + b;
                } else if (t < (2.5/2.75)) {
                    return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;
                }
                return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;
            },
            bounceBoth: function(t, b, c, d){
                if (t < d/2) {
                    return Tween['bounceIn'](t*2, 0, c, d) * 0.5 + b;
                }
                return Tween['bounceOut'](t*2-d, 0, c, d) * 0.5 + c*0.5 + b;
            }
        }




        move(oBox,{
            width:"400px",
            height:"400px",
            left:"400px"
        },3000);


    </script>
</body>
</html>