今天就跟大家聊聊有关使用tween.js怎么实现一个缓动补间动画算法，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
tween文件代码
/*
* Tween.js
* t: current time（当前时间）；
* b: beginning value（初始值）；
* c: change in value（变化量）；
* d: duration（持续时间）。
*/
var Tween = {
Linear: function(t, b, c, d) { //匀速
return c * t / d + b;
},
Quad: { //二次方缓动效果
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: { //三次方缓动效果
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: { //四次方缓动效果
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: { //五次方缓动效果
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: { //正弦缓动效果
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: { //指数缓动效果
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: { //圆形缓动函数
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: { //指数衰减正弦曲线缓动函数
easeIn: function(t, b, c, d, a, p) { //加速
var s;
if (t==0) return b;
if ((t /= d) == 1) return b + c;
if (typeof p == "undefined") p = d * .3;
if (!a || a < Math.abs(c)) {
s = p / 4;
a = c;
} else {
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) { //减速
var s;
if (t==0) return b;
if ((t /= d) == 1) return b + c;
if (typeof p == "undefined") p = d * .3;
if (!a || a < Math.abs(c)) {
a = c;
s = p / 4;
} else {
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) { //先加速后减速
var s;
if (t==0) return b;
if ((t /= d / 2) == 2) return b+c;
if (typeof p == "undefined") p = d * (.3 * 1.5);
if (!a || a < Math.abs(c)) {
a = c;
s = p / 4;
} else {
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: { //超过范围的三次方的缓动函数
easeIn: function(t, b, c, d, s) {
if (typeof s == "undefined") s = 1.70158;
return c * (t /= d) * t * ((s + 1) * t - s) + b;
},
easeOut: function(t, b, c, d, s) {
if (typeof 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 (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;
}
},
Bounce: { //指数衰减的反弹曲线缓动函数
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;
}
}
}
}
Math.tween = Tween;举个栗子
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script src="https://cdn.jsdelivr.net/npm/vue"></script> <script src="Tween/tween.js"></script> <style> *{margin: 0;padding: 0;} .out{width: 800px;height: 500px;background: #e5e5e5;position: relative;padding: 20px;text-align: center;} .inner{width: 50px;height: 50px;border-radius: 50%;background: #FF0000; position: absolute;left: 50px;top: 50px;} </style> </head> <body> <div id="app" class="out"> <div class="inner" id="ball"></div> <button id="start" @click="start()">start</button> </div> </body> <script type="text/javascript"> var app = new Vue({ el: '#app', data: { t: 0, b: 50, c: 500, d: 1500, }, methods:{ start(){ var t = this.t; const b = this.b; const c = this.c; const d = this.d; const setInt = setInterval(()=>{ t++; console.log(t) if(t==300){clearInterval(setInt)} console.log(t); const ballLeft = Tween.Linear(t,b,c,d)+"px"; ball.style.left = ballLeft; },20) } } }) </script> </html>
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