利用JS时间版运动框架知识做出一个小例子
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input, textarea, select {
*font-size: 100%
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<style>
#wrap{
position: absolute;
left: 0;
width: 100px;
height: 100px;
background-color: #ff3b5b;
}
</style>
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<body>
<div id="wrap"></div>
<script>/*
时间版运动框架
@author
mzs555557
@param
obj -- object 对象
attr --- String 运动属性字符串
target -- number 目标位置数值
time -- number 时间
t -- 已运动的时间
b -- 起始位置
c -- 运动路程
d -- 运动时间
@return
function
*/var move = (function() {
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;
},
};
return function (obj , attr ,target , time){
//获得attr初始数值
var startVal = parseFloat((obj.currentStyle || getComputedStyle(obj))[attr]);
//计算总位移
var S = target - startVal;
//得到初始时间
var sTime = new Date();
!function m(){
var s_ = new Date() - sTime;
if (s_ >= time){
s_ = time;
} else{
requestAnimationFrame(m);
}
obj.style[attr] = Tween.elasticIn(s_ , startVal , S , time) + 'px';//只要改变Tweeen.??就可以选择出不同的运动方式,而能调用的运动方式在Tween中
}();
}
})();
var oWrap = document.getElementById('wrap');
move(oWrap ,"left" , 800 , 5000);</script>
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</html>