jQuery Easing 使用方法及其图解

从jQuery API 文档中可以知道，jQuery自定义动画的函数.animate( properties [, duration] [, easing] [, complete] )有四个参数：

properties：一组包含作为动画属性和终值的样式属性和及其值的集合
duration(可选)：动画执行时间，其值可以是三种预定速度之一的字符串("slow", "normal", or "fast")或表示动画时长的毫秒数值(如：1000)
easing(可选)：要使用的过渡效果的名称，如："linear" 或"swing"
complete(可选)：在动画完成时执行的函数

其中参数easing默认有两个效果："linear"和"swing"，如果需要更多效果就要插件支持了，jQuery Easing Plugin提供了像"easeOutExpo"、"easeOutBounce"等30多种效果，大家可以点击这里去看每一种easing的演示效果，下面详细介绍下其使用方法及每种easing的曲线图。

引入之后，easing参数可选的值就有以下32种：

linear
swing
easeInQuad
easeOutQuad
easeInOutQuad
easeInCubic
easeOutCubic
easeInOutCubic
easeInQuart
easeOutQuart
easeInOutQuart
easeInQuint
easeOutQuint
easeInOutQuint
easeInExpo
easeOutExpo
easeInOutExpo
easeInSine
easeOutSine
easeInOutSine
easeInCirc
easeOutCirc
easeInOutCirc
easeInElastic
easeOutElastic
easeInOutElastic
easeInBack
easeOutBack
easeInOutBack
easeInBounce
easeOutBounce
easeInOutBounce

jQuery 1.4版本中对animate()方法，easing的方法进行了扩展，支持为每个属性指定easing方法，详细请参考这里，如：

$(myElement).animate({  
    left: [500, 'swing'],  
    top: [200, 'easeOutBounce']  
});

也可以用另外一种写法：

$(myElement).animate({  
    left: 500,  
    top: 200  
}, {  
    specialEasing: {  
        left: 'swing',  
        top: 'easeOutBounce'  
    }  
});

使用jQuery内置动画函数如slideUp()、slideDown()等来指定easing效果，以下两种方法都可以：

$(myElement).slideUp(1000, method, callback});  
$(myElement).slideUp({  
    duration: 1000,   
    easing: method,   
    complete: callback  
});

jQuery easing 图解

以下图解可以让你更容易理解每一种easing的效果


1. linear	2. swing	3. easeInQuad	4. easeOutQuad	5. easeInOutQuad	6. easeInCubic

7. easeOutCubic	8. easeInOutCubic	9. easeInQuart	10. easeOutQuart	11. easeInOutQuart	12. easeInQuint

13. easeOutQuint	14. easeInOutQuint	15. easeInExpo	16. easeOutExpo	17. easeInOutExpo	18. easeInSine

19. easeOutSine	20. easeInOutSine	21. easeInCirc	22. easeOutCirc	23. easeInOutCirc	24. easeInElastic

25. easeOutElastic	26. easeInOutElastic	27. easeInBack	28. easeOutBack	29. easeInOutBack	30. easeInBounce

31. easeOutBounce	32. easeInOutBounce

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>弹跳</title>
    <link rel="stylesheet" href="css/demo.css">
    <script src="js/jquery-3.1.1.js"></script>
    <script type="text/javascript" src="js/jquery.easing.1.3.js"></script>
    <script src="js/demo.js"></script>
</head>
<body>
<div style=" 80%;margin: 40px auto;padding: 10px;">
    <div class="item">
        <div id="item-container" class="item-container"></div>
        <div id="item-shadow" class="item-shadow"></div>
    </div>
    <div class="item">
        <div class="item-container"></div>
        <div class="item-shadow"></div>
    </div>
</div>
</body>
</html>

demo

*{
    margin: 0;
    padding: 0;
}
.item{
    position: relative;
    display: inline-block;
    width: 300px;
    height: 200px;
    margin: 20px;
}
.item-container{
    position: absolute;
    z-index: 99;
    width: 300px;
    height: 200px;
    border-radius: 20px;
    background-color: #434343;
    border: 3px solid #242424;
    cursor: pointer;
    /*
    使用多层阴影实现<span class="wp_keywordlink_affiliate"><a href="http://www.yyyweb.com/tag/%e6%8c%89%e9%92%ae" title="查看按钮中的全部文章" target="_blank">按钮</a></span>立体效果
    第一层：Y轴偏移1像素、不透明度为0.25的白色外阴影效果
    第二层：Y轴偏移1像素、不透明度为0.25的白色内阴影效果
    第三层：偏移位0、不透明度为0.25的黑色外阴影效果
    第四层：Y轴偏移20像素、不透明度为0.03的白色内阴影效果
    第五层：X轴偏移-20像素、Y轴偏移20像素、不透明度为0.15的黑色内阴影效果
    第六层：X轴偏移20像素、Y轴偏移20像素、不透明度为0.05的白色内阴影效果
    */
    box-shadow: rgba(255,255,255,0.25) 0px 1px 0px, inset rgba(255,255,255,0.25) 0px 1px 0px, inset rgba(0,0,0,0.25) 0px 0px 0px, inset rgba(255,255,255,0.03) 0px 20px 0px, inset rgba(0,0,0,0.15) 0px -20px 20px, inset rgba(255,255,255,0.05) 0px 20px 20px;
}
.item-shadow{
    position: absolute;
    top: 205px;
    z-index: 1;
    width: 290px;
    height: 10px;
    margin-left: 5px;
    border-radius: 30% 30% 50% 50%/50%;
    background-color: #000;
    opacity: 0.85;
    box-shadow: 0 0 10px 8px #000;
}

demo.css

jQuery.easing['jswing'] = jQuery.easing['swing'];

jQuery.extend( jQuery.easing,
    {
        def: 'easeOutQuad',
        swing: function (x, t, b, c, d) {
            //alert(jQuery.easing.default);
            return jQuery.easing[jQuery.easing.def](x, t, b, c, d);
        },
        easeInQuad: function (x, t, b, c, d) {
            return c*(t/=d)*t + b;
        },
        easeOutQuad: function (x, t, b, c, d) {
            return -c *(t/=d)*(t-2) + b;
        },
        easeInOutQuad: function (x, t, b, c, d) {
            if ((t/=d/2) < 1) return c/2*t*t + b;
            return -c/2 * ((--t)*(t-2) - 1) + b;
        },
        easeInCubic: function (x, t, b, c, d) {
            return c*(t/=d)*t*t + b;
        },
        easeOutCubic: function (x, t, b, c, d) {
            return c*((t=t/d-1)*t*t + 1) + b;
        },
        easeInOutCubic: function (x, 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;
        },
        easeInQuart: function (x, t, b, c, d) {
            return c*(t/=d)*t*t*t + b;
        },
        easeOutQuart: function (x, t, b, c, d) {
            return -c * ((t=t/d-1)*t*t*t - 1) + b;
        },
        easeInOutQuart: function (x, 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;
        },
        easeInQuint: function (x, t, b, c, d) {
            return c*(t/=d)*t*t*t*t + b;
        },
        easeOutQuint: function (x, t, b, c, d) {
            return c*((t=t/d-1)*t*t*t*t + 1) + b;
        },
        easeInOutQuint: function (x, 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;
        },
        easeInSine: function (x, t, b, c, d) {
            return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
        },
        easeOutSine: function (x, t, b, c, d) {
            return c * Math.sin(t/d * (Math.PI/2)) + b;
        },
        easeInOutSine: function (x, t, b, c, d) {
            return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
        },
        easeInExpo: function (x, t, b, c, d) {
            return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
        },
        easeOutExpo: function (x, t, b, c, d) {
            return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
        },
        easeInOutExpo: function (x, 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;
        },
        easeInCirc: function (x, t, b, c, d) {
            return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
        },
        easeOutCirc: function (x, t, b, c, d) {
            return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
        },
        easeInOutCirc: function (x, 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;
        },
        easeInElastic: function (x, t, b, c, d) {
            var s=1.70158;var p=0;var a=c;
            if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
            if (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;
        },
        easeOutElastic: function (x, t, b, c, d) {
            var s=1.70158;var p=0;var a=c;
            if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
            if (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;
        },
        easeInOutElastic: function (x, t, b, c, d) {
            var s=1.70158;var p=0;var a=c;
            if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);
            if (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 -.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;
        },
        easeInBack: function (x, t, b, c, d, s) {
            if (s == undefined) s = 1.70158;
            return c*(t/=d)*t*((s+1)*t - s) + b;
        },
        easeOutBack: function (x, t, b, c, d, s) {
            if (s == undefined) s = 1.70158;
            return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
        },
        easeInOutBack: function (x, t, b, c, d, s) {
            if (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;
        },
        easeInBounce: function (x, t, b, c, d) {
            return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
        },
        easeOutBounce: function (x, 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;
            }
        },
        easeInOutBounce: function (x, t, b, c, d) {
            if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
            return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
        }
    });

jquery.easing.1.3.js

/**
 * Created by Administrator on 2017/3/16.
 */
$(function(){
    $(".item-container").hover(function(){
        upHover(this);
    },function(){
        downHover(this);
    });
});
function upHover(obj){
    $(obj).animate({
        top:'-20px'
    },{
        easing:'easeInOutQuint'
    });
    $(obj).next().animate({
        '310px',
        'margin-left':'-5px',
        opacity:'0.7',
        'box-shadow':'0 0 16px 16px #000'
    },{
        easing:'easeInOutQuint'
    });
}
function downHover(obj){
    $(obj).animate({
        top:'0'
    },{
        duration: 1000,
        easing:'easeOutBounce'
    });
    $(obj).next().animate({
        '290px',
        'margin-left':'5px',
        opacity:'0.9',
        'box-shadow':'0 0 10px 8px #000'
    },{
        duration: 1000,
        easing:'easeOutBounce'
    });
}

demo.js