js怎么使用animation.js动画插件
animation.js动画插件的内容及详解
若要使用，直接copy过去；
此文是为了方便自己学习而使用，废话不多说，代码如下：
/*
参数： * 必填 []选填
*obj 需要运动的对象（原生DOM节点）
*json 变化的属性（必须是json对象，） 低版本IE要在css给初始值，不然时是auto
*time 动画持续时间
[easing] 运动函数（默认匀速运动）
1.Linear 匀速， 此时speed可以不填。
2.Quad 二次方缓动效果
3.Cubic 三次方缓动效果
4.Quart 四次方缓动效果
5.Quint 五次方缓动效果
6.Sine 正弦缓动效果
7.Expo 指数缓动效果
8.Circ 圆形缓动函数
9.Elastic 指数衰减正弦曲线缓动函数
10.Back 超过范围的三次方的缓动函数
11.Bounce 指数衰减的反弹曲线缓动函数
[speed] 运动方式（值为Number）
0 代表加速运动
1 代表减速运动
2 先加速后减速
[callback] 回调函数，this指向obj。
*/
/*
* 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）。
*/
function animation(ele, data, time, cb) {
// requestAnimationFrame 的兼容
window.requestAnimationFrame = window.requestAnimationFrame || function (cb) { return setTimeout(cb, 1000 / 60) }
// 获取对象的样式
function getStyle(ele) {return ele.currentStyle || getComputedStyle(ele)}
// tween.js 运动库
var Tween = {
Linear: {
easeIn: 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) {
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) {
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) {
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: {
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: {
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;
}
}
}
}
// 运动函数的选择配置项
var option = data.options // options 存起来
// 对象要改变的属性
var valueDate = data.data
// speed的数组【easeIn。。】
var speedArr = ["easeIn", "easeOut", "easeInOut"]
// 存放起始值
var startValue = {}
// 终点 - 起始 = 变化量
var changeValue = {}
// 起始时间
var startTime = new Date() // 起始时间
var eleStart = getStyle(ele) // 取到ele对象的所有样式
for (var key in valueDate) {
var val = parseFloat(eleStart[key])
startValue[key] = isNaN(val) ? 0 : val
changeValue[key] = parseFloat(valueDate[key]) - startValue[key] // 目标值 - 起始值 = 变化量
}
// options 的默认情况
var speed = option && option.speed
var easing = option && option.easing
if (typeof option === "object") {
if("easing" in option){ // options 存在运动函数
speed = speed || 0
// 确定easing 是不是Linear
if(easing.toLowerCase() === 'linear'){
speed = 0
easing = "Linear"
}
}else{
speed = 0
easing = "Linear"
}
}else{ // 没有options 参数 默认 匀速运动
speed = 0
easing = "Linear"
}
run()
function run() { // 计算每个调用时刻的 属性值
var t = new Date() - startTime
var t_ = time - t
for (var key in changeValue) {
var val = Tween[easing][speedArr[speed]](t, startValue[key], changeValue[key], time)
var currentValue = parseFloat(valueDate[key])
// 限制最大值
if(t_ <= 0){
val = Math.min(val, currentValue)
val = Math.max(val, currentValue)
}
if(key.toLowerCase() === "opacity"){
ele.style[key] = val
ele.style.filter = "alpha(opacity=" + val * 100 + ")" // IE透明度
}else{
ele.style[key] = val + "px"
}
}
if(t_ <= 0){
cb && cb()
}else{
requestAnimationFrame(run)
}
}
}