mTween运动函数以及tween运动方式函数

mTween运动函数

//obj运动对象
//attr运动元素
//target运动目标点
//duration 运动时间
//fx 运动方式
//callBack回调函数

function mTween(obj,attr,target,duration,fx,callBack){
	//获取起始位置
	var begin = parseFloat(getComputedStyle(obj)[attr]);
	//算出总距离
	var count = target - begin;
	//var time = new Date().getTime();
	//记录时间
	var time = +new Date();
	//防止定时器冲突,所以每次开启先清除。
	clearInterval(obj[attr])
	obj[attr] = setInterval(function(){
		//获取已过去的时间
		var t = +new Date() - time ;
		// console.log(1);
		//已过去时间超出总时间代表运动结束
		if(t>=duration){
			t = duration;
			//清除定时器
			clearInterval(obj[attr]);
			
		}
		//var value = count*t/duration + begin;
		//根据传入的运动方式算出obj应该运动的值
		var value = Tween[fx](t,begin,count,duration);
		
		obj.style[attr] = value + 'px';
		
		if(t == duration){
			//如果有回调函数就执行回调
			callBack&&callBack();
		}
	},16)
}

tween运动方式函数

/*
* t : time 已过时间
* b : begin 起始值
* c : count 总的运动值
* d : duration 持续时间
*
* 曲线方程
*
* http://www.cnblogs.com/bluedream2009/archive/2010/06/19/1760909.html
* */

//Tween.linear();

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;
	}
}

  

原文地址:https://www.cnblogs.com/yangxue72/p/7992275.html