让div运动起来 js实现缓动效果

本文实例为大家分享了js实现缓动效果的具体代码，供大家参考，具体内容如下

var tween = {
linear:function(t,b,c,d){
return c*t/d + b;
},
easeIn:function(t,b,c,d){
return c * ( t /= d ) * t + b;
},
strongEaseIn:function(t,b,c,d){
return c * ( t /= d ) * t * t * t * t + b;
},
strongEaseOut:function(t,b,c,d){
return c * ( ( t = t / d -1 ) * t * t * t * t +1 ) + b;
},
sineaseIn:function(t,b,c,d){
return c * ( t /= d ) * t * t + b;
},
sineaseOut:function(t,b,c,d){
return c * ( ( t = t / d -1 ) * t * t *t +1 ) + b;
}
};
var Animate = function(dom){
this.dom = dom;
this.startTime = 0;
this.startPos = 0;
this.endPos = 0;
this.propertyName = null;
this.easing = null;
this.duration = null;
}
Animate.prototype.start = function(propertyName,endPos,duration,easing){
this.startTime = +new Date;
this.startPos = this.dom.getBoundingClientRect()[propertyName];
this.propertyName = propertyName;
this.endPos = endPos;
this.duration = duration;
this.easing = tween[easing];
var self = this;
var timeId = setInterval(function(){
if(self.step() === false){
clearInterval(timeId);
}
},19);
}
Animate.prototype.step = function(){
var t = +new Date;
if(t>=this.startTime + this.duration){
this.update(this.endPos);
return false;
}
var pos = this.easing(t-this.startTime, this.startPos, this.endPos - this.startPos, this.duration);
this.update(pos);
}
Animate.prototype.update = function(pos){
this.dom.style[this.propertyName] = pos + 'px';
}
var div = document.getElementById('div');
var animate = new Animate(div);
animate.start('left',500,1000,'strongEaseOut');

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

您可能感兴趣的文章:

• js实现带缓动动画的导航栏效果
• JS轮播图中缓动函数的封装
• JS+HTML5手机开发之滚动和惯性缓动实现方法分析
• javascript中的缓动效果实现程序
• javascript简易缓动插件(源码打包)
• javascript 45种缓动效果 非常酷
• JavaScript Tween算法及缓动效果