foreword
I still remember that around 2015, web development was still dominated by jQuery. Although Vue and React became popular, and Angular also began to seize the market later, jQuery still occupies a large proportion in the market. Most of the html pages at that time were written with jQuery, and there were quite a lot of plug-ins designed for jQuery. For example, it is very convenient to use jquery.js combined with jquery.easing.js to achieve animation effects. The reason why the jquery.easing.js extension library is used is because jQuery's animate animation method has fewer preset speed parameters, and jquery.easing.js can help you achieve special animation effects.
$(selector).animate({params},speed,callback)
// 参数说明：
// params：必需的，参数定义形成动画的 CSS 属性；
// speed：可选的，参数规定效果的时长，如："swing"，"slow"，"fast"，"linear"，"normal" 或 毫秒数值；
// callback：可选的，参数是动画完成后所执行的函数名称；Easing function cheat sheet : https://easings.net/zh-cn
1. The Vue project introduces jQuery
(1) Import dependencies
npm i jquery(2) How to use
import $ from 'jquery'
import jQuery from 'jquery'
console.log($('body'))
console.log(jQuery ('body'))2. Add jQuery.easing extension
(1) Download a jquery.easing.js file arbitrarily
(2) Format the code of this file for easy code extraction
(3) If it is a Vue2 project, just add the following code to the mounted lifecycle function of the vue page. If it is a Vue3 project, add the following code to the onMounted lifecycle function of the vue page
/*
* jQuery Easing v1.3 - http://gsgd.co.uk/sandbox/jquery/easing/
*
* Uses the built in easing capabilities added In jQuery 1.1
* to offer multiple easing options
*
* TERMS OF USE - EASING EQUATIONS
*
* Open source under the BSD License.
*
* Copyright © 2001 Robert Penner
* All rights reserved.
*
* TERMS OF USE - jQuery Easing
*
* Open source under the BSD License.
*
* Copyright © 2008 George McGinley Smith
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the author nor the names of contributors may be used to endorse
* or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
jQuery.easing.jswing = jQuery.easing.swing;
jQuery.extend(jQuery.easing, {
def: "easeOutQuad",
swing: function (e, f, a, h, g) { return jQuery.easing[jQuery.easing.def](e, f, a, h, g) },
easeInQuad: function (e, f, a, h, g) { return h * (f /= g) * f + a },
easeOutQuad: function (e, f, a, h, g) { return -h * (f /= g) * (f - 2) + a },
easeInOutQuad: function (e, f, a, h, g) { if ((f /= g / 2) < 1) { return h / 2 * f * f + a } return -h / 2 * ((--f) * (f - 2) - 1) + a },
easeInCubic: function (e, f, a, h, g) { return h * (f /= g) * f * f + a },
easeOutCubic: function (e, f, a, h, g) { return h * ((f = f / g - 1) * f * f + 1) + a },
easeInOutCubic: function (e, f, a, h, g) { if ((f /= g / 2) < 1) { return h / 2 * f * f * f + a } return h / 2 * ((f -= 2) * f * f + 2) + a },
easeInQuart: function (e, f, a, h, g) { return h * (f /= g) * f * f * f + a },
easeOutQuart: function (e, f, a, h, g) { return -h * ((f = f / g - 1) * f * f * f - 1) + a },
easeInOutQuart: function (e, f, a, h, g) { if ((f /= g / 2) < 1) { return h / 2 * f * f * f * f + a } return -h / 2 * ((f -= 2) * f * f * f - 2) + a },
easeInQuint: function (e, f, a, h, g) { return h * (f /= g) * f * f * f * f + a },
easeOutQuint: function (e, f, a, h, g) { return h * ((f = f / g - 1) * f * f * f * f + 1) + a },
easeInOutQuint: function (e, f, a, h, g) { if ((f /= g / 2) < 1) { return h / 2 * f * f * f * f * f + a } return h / 2 * ((f -= 2) * f * f * f * f + 2) + a },
easeInSine: function (e, f, a, h, g) { return -h * Math.cos(f / g * (Math.PI / 2)) + h + a },
easeOutSine: function (e, f, a, h, g) { return h * Math.sin(f / g * (Math.PI / 2)) + a },
easeInOutSine: function (e, f, a, h, g) { return -h / 2 * (Math.cos(Math.PI * f / g) - 1) + a },
easeInExpo: function (e, f, a, h, g) { return (f == 0) ? a : h * Math.pow(2, 10 * (f / g - 1)) + a },
easeOutExpo: function (e, f, a, h, g) { return (f == g) ? a + h : h * (-Math.pow(2, -10 * f / g) + 1) + a },
easeInOutExpo: function (e, f, a, h, g) { if (f == 0) { return a } if (f == g) { return a + h } if ((f /= g / 2) < 1) { return h / 2 * Math.pow(2, 10 * (f - 1)) + a } return h / 2 * (-Math.pow(2, -10 * --f) + 2) + a },
easeInCirc: function (e, f, a, h, g) { return -h * (Math.sqrt(1 - (f /= g) * f) - 1) + a },
easeOutCirc: function (e, f, a, h, g) { return h * Math.sqrt(1 - (f = f / g - 1) * f) + a },
easeInOutCirc: function (e, f, a, h, g) { if ((f /= g / 2) < 1) { return -h / 2 * (Math.sqrt(1 - f * f) - 1) + a } return h / 2 * (Math.sqrt(1 - (f -= 2) * f) + 1) + a },
easeInElastic: function (f, h, e, l, k) { var i = 1.70158; var j = 0; var g = l; if (h == 0) { return e } if ((h /= k) == 1) { return e + l } if (!j) { j = k * 0.3 } if (g < Math.abs(l)) { g = l; var i = j / 4 } else { var i = j / (2 * Math.PI) * Math.asin(l / g) } return -(g * Math.pow(2, 10 * (h -= 1)) * Math.sin((h * k - i) * (2 * Math.PI) / j)) + e },
easeOutElastic: function (f, h, e, l, k) { var i = 1.70158; var j = 0; var g = l; if (h == 0) { return e } if ((h /= k) == 1) { return e + l } if (!j) { j = k * 0.3 } if (g < Math.abs(l)) { g = l; var i = j / 4 } else { var i = j / (2 * Math.PI) * Math.asin(l / g) } return g * Math.pow(2, -10 * h) * Math.sin((h * k - i) * (2 * Math.PI) / j) + l + e },
easeInOutElastic: function (f, h, e, l, k) { var i = 1.70158; var j = 0; var g = l; if (h == 0) { return e } if ((h /= k / 2) == 2) { return e + l } if (!j) { j = k * (0.3 * 1.5) } if (g < Math.abs(l)) { g = l; var i = j / 4 } else { var i = j / (2 * Math.PI) * Math.asin(l / g) } if (h < 1) { return -0.5 * (g * Math.pow(2, 10 * (h -= 1)) * Math.sin((h * k - i) * (2 * Math.PI) / j)) + e } return g * Math.pow(2, -10 * (h -= 1)) * Math.sin((h * k - i) * (2 * Math.PI) / j) * 0.5 + l + e },
easeInBack: function (e, f, a, i, h, g) { if (g == undefined) { g = 1.70158 } return i * (f /= h) * f * ((g + 1) * f - g) + a },
easeOutBack: function (e, f, a, i, h, g) { if (g == undefined) { g = 1.70158 } return i * ((f = f / h - 1) * f * ((g + 1) * f + g) + 1) + a },
easeInOutBack: function (e, f, a, i, h, g) { if (g == undefined) { g = 1.70158 } if ((f /= h / 2) < 1) { return i / 2 * (f * f * (((g *= (1.525)) + 1) * f - g)) + a } return i / 2 * ((f -= 2) * f * (((g *= (1.525)) + 1) * f + g) + 2) + a },
easeInBounce: function (e, f, a, h, g) { return h - jQuery.easing.easeOutBounce(e, g - f, 0, h, g) + a },
easeOutBounce: function (e, f, a, h, g) { if ((f /= g) < (1 / 2.75)) { return h * (7.5625 * f * f) + a } else { if (f < (2 / 2.75)) { return h * (7.5625 * (f -= (1.5 / 2.75)) * f + 0.75) + a } else { if (f < (2.5 / 2.75)) { return h * (7.5625 * (f -= (2.25 / 2.75)) * f + 0.9375) + a } else { return h * (7.5625 * (f -= (2.625 / 2.75)) * f + 0.984375) + a } } } },
easeInOutBounce: function (e, f, a, h, g) { if (f < g / 2) { return jQuery.easing.easeInBounce(e, f * 2, 0, h, g) * 0.5 + a } return jQuery.easing.easeOutBounce(e, f * 2 - g, 0, h, g) * 0.5 + h * 0.5 + a }
});
(4) How to use
$('body').animate(
{ 'margin-top': '50%' }, { easing: 'easeOutExpo' }
)