1200字范文 > 「HTML+CSS」自定义加载动画【050】

「HTML+CSS」自定义加载动画【050】

时间：2020-05-11 05:28:02

前言

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效果展示

Demo代码

HTML

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><link rel="stylesheet" href="style.css"><title>Document</title></head><body><section><span></span></section></body></html>

CSS

html, body {margin: 0;height: 100%;}body {display: flex;justify-content: center;align-items: center;background: #263238;}section {width: 650px;height: 300px;padding: 10px;position: relative;display: flex;align-items: center;justify-content: center;/* 红色边框仅作提示 */border: 2px solid red;}span {width: 80px;height: 80px;border-radius: 50%;display: inline-block;position: relative;/* background-color: rebeccapurple; */}span::after {content: '';width: 32px;height: 32px;border-radius: 50%;position: absolute;left: 0;/* background-color: red; */transform: translate(-50%, 100%);animation: loading 2s linear infinite;top: 0;}@keyframes loading {0% {background: rgba(255, 255, 255, 1);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}14% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 1), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}28% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 1), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}42% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 1), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}57% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 1), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}71% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 1), 18px 32px 0 -6px rgba(255, 255, 255, 0);}85% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 1);}100% {background: rgba(255, 255, 255, 0.5);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}}

原理详解

步骤1

使用span标签，设置

宽度、高度均为80px背景色：黄色圆角化

width: 80px;height: 80px;background-color: yellow;border-radius: 50%;

效果图如下

步骤2

利用span::after,设置

绝对定位（left: 0）宽度、高度均为32px背景色：红色圆角化

content: '';width: 32px;height: 32px;border-radius: 50% ;position: absolute;left: 0;

效果图如下

步骤3

移动红色小球位置

/*向左移动自身50% 再右移自身100%的距离*/transform: translate(-50%, 100%);

效果图如下

步骤4

使用span::after的阴影（box-shadow）充当白色小球

一共需要6个阴影

为6个小球定义位置，使之分布至黄色小球的四周

box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 1), 56px -38px 0 -2px rgba(255, 255, 255, 1), 78px -10px 0 -3px rgba(255, 255, 255, 1), 68px 20px 0 -4px rgba(255, 255, 255, 1),44px 34px 0 -5px rgba(255, 255, 255, 1), 18px 32px 0 -6px rgba(255, 255, 255, 1);

效果图如下

步骤5

为这些小球添加动画

此时修改红色小球背景色为白色

大球四周就拥有7个白色小球（一个span:after 加上6个阴影产生的小球）

我们需要利用animation控制这7个小球的显示与否

每个小球的状态假设只有两种：显示与不显示

使用颜色对应两者状态

显示：rgba(255, 255, 255, 1)不显示：rgba(255, 255, 255, 0)

每次只显示一个小球，那么7个小球就产生了7帧关键帧

在这里我们使用8帧，最后一帧颜色稍微浅一点（其实7帧也行，看个人喜好）

第一帧

background: rgba(255, 255, 255, 1);/*span:after的颜色*/box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);

效果图如下

第二帧

background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 1), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);

效果图如下

第三帧

background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 1), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);

效果图如下

第四帧

background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 1), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);

效果图如下

第五帧

background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 1), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);

效果图如下

第六帧

background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 1), 18px 32px 0 -6px rgba(255, 255, 255, 0);

效果图如下

第七帧

background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 1);

效果图如下

第八帧

background: rgba(255, 255, 255, 0.5);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);

效果图如下

步骤6

使用动画均匀过度这8帧

animation: loading 2s linear infinite;

@keyframes loading {/*第一帧*/0% {background: rgba(255, 255, 255, 1);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}/*第二帧*/14% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 1), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}/*第三帧*/28% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 1), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}/*第四帧*/42% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 1), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}/*第五帧*/57% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 1), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}/*第六帧*/71% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 1), 18px 32px 0 -6px rgba(255, 255, 255, 0);}/*第七帧*/85% {background: rgba(255, 255, 255, 0);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 1);}/*第八帧*/100% {background: rgba(255, 255, 255, 0.5);box-shadow: 18px -38px 0 -1px rgba(255, 255, 255, 0), 56px -38px 0 -2px rgba(255, 255, 255, 0), 78px -10px 0 -3px rgba(255, 255, 255, 0), 68px 20px 0 -4px rgba(255, 255, 255, 0), 44px 34px 0 -5px rgba(255, 255, 255, 0), 18px 32px 0 -6px rgba(255, 255, 255, 0);}}

效果图如下