标签：动画专题 color transition transform ff7777 height background CSS

0x01 过渡 transition

过渡（transition）是应用于特定元素的 CSS 属性，在指定时间内平滑过渡到目标样式

（1）必要属性

使用 transition-property 指定需要过渡的 CSS 属性
- 可以列入一个或多个 CSS 属性
- 也可以使用 all 值，表示所有变化的 CSS 属性都需要过渡
- 仅可以用于过渡的值是可以用数字表示的属性，浏览器会计算并插入中间值实现过渡
使用 transition-duration 指定过渡需要的持续时间

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    button {
      width: 200px;
      height: 100px;
      font-size: 20px;
      border: none;
      color: white;
      background-color: red;
      cursor: pointer;

      transition-property: background-color;
      transition-duration: 1s;
    }

    button:hover {
      background-color: purple;
    }
  </style>
</head>

<body>
  <button>Button</button>
</body>

</html>

（2）其他属性

使用 transition-timing-function 指定过渡的时序函数（指过渡的变化方式）
- ease：慢入、快变、慢出（默认）
- linear：匀速
- ease-in：缓慢开始，结束前加快
- ease-out：快速开始，结束前减慢
- ease-in-out：与 ease 类似
使用 transition-delay 指定过渡的延迟时间

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    button {
      width: 200px;
      height: 100px;
      font-size: 20px;
      border: none;
      color: white;
      background-color: red;
      cursor: pointer;

      transition-property: background-color;
      transition-duration: 1s;

      transition-timing-function: ease-in;
      transition-delay: 0.5s;
    }

    button:hover {
      background-color: purple;
    }
  </style>
</head>

<body>
  <button>Button</button>
</body>

</html>

（3）缩写属性

transition: property duration timing-function delay[, property duration timing-function delay];

0x02 变换 transform

变换（transform）是指改变元素的尺寸、形状以及位置
变换提供了 4 种函数来控制元素的显示方式：scale、translate、rotate、skew
transform-origin：设定变换原点
- 默认取值包括 top、left、right、bottom、center 以及 top left、top right、bottom right、bottom left
- 也可以通过百分比、数值分别设定在 \(x\) 与 \(y\) 轴构成的坐标

（1）scale

通过放缩元素的宽高，改变元素的尺寸
scaleX()：改变元素宽度，大于 \(1\) 表示放大倍数，\(0-1\) 之间表示缩小倍率（下同）
scaleY()：改变元素高度
scale()：一个值表示同时改变元素的宽高，两个值表示同时分别改变元素的宽度与高度

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    div {
      width: 300px;
      height: 200px;
      display: block;
      margin: auto;
      background-color: #ff7777;
      transition: transform 1s linear;
    }

    div:hover {
      transform: scale(1.5, 0.5);
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

（2）translate

通过平移的方式，改变元素的位置

二维变换

translateX()：沿 \(x\) 轴方向移动，正值向右、负值向左
translateY()：沿 \(y\) 轴方向移动，正值向下、负值向上
translate(x, y)：同时沿 \(x\) 与 \(y\) 轴移动，第一个参数是 \(x\) 轴方向移动，第二个参数是 \(y\) 轴方向移动

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    div {
      width: 300px;
      height: 200px;
      display: block;
      margin: auto;
      background-color: #ff7777;
      transition: transform 1s linear;
    }

    div:hover {
      transform: translate(-100px, 100px);
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

三维变换

translateZ()：沿 \(z\) 轴方向移动，正值向外、负值向内

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      perspective: 1000px;	// 设定人眼与屏幕的距离为 1000px(即人眼在 z 轴 1000px 处)
    }

    div {
      width: 300px;
      height: 200px;
      display: block;
      margin: auto;
      background-color: #ff7777;
      transform-origin: bottom left;
      transition: transform 1s linear;
    }

    div:hover {
      transform: translateZ(300px);	// 效果看起来是放大(即近大远小)大于到人眼的距离时会消失
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

（3）rotate

通过旋转，改变元素的角度

二维变换

rotate()：默认以元素中心为中心，旋转指定角度(deg)、指定梯度(grad)或旋转圈数(turn)，正值顺时针、负值逆时针

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    div {
      width: 300px;
      height: 200px;
      display: block;
      margin: auto;
      background-color: #ff7777;
      transition: transform 1s linear;
    }

    div:hover {
      transform: rotate(1turn);
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

三维变换

rotateX()：沿 \(x\) 轴旋转，正负值旋转方向不同（下同）
rotateY()：沿 \(y\) 轴旋转
rotateZ()：沿 \(z\) 轴旋转

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      perspective: 1000px;
    }

    div {
      width: 300px;
      height: 200px;
      display: block;
      margin: auto;
      background-color: #ff7777;
      transition: transform 1s linear;
    }

    div:hover {
      transform: rotateX(30deg);
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

（4）skew

通过根据 \(x\) 轴或 \(y\) 轴倾斜，改变元素的形状
skewX()：在 \(x\) 轴方向上倾斜指定角度，正负值方向不同（下同）
skewX()：在 \(y\) 轴方向上倾斜指定角度
skew(x, y)：同时分别改变元素在 \(x\) 与 \(y\) 轴上的倾斜

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      perspective: 1000px;
    }

    div {
      width: 300px;
      height: 200px;
      display: block;
      margin: auto;
      background-color: #ff7777;
      transition: transform 1s linear;
    }

    div:hover {
      transform: skewX(30deg);
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

（5）案例

a. 旋入

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      border: 3px solid black;
      padding: 30px 80px;
      font-size: 30px;
      font-weight: bolder;
      position: relative;
      overflow: hidden;
    }

    a::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 105%;
      height: 100%;
      background-color: #ff7777;
      z-index: -1;
      transition: transform 0.5s ease-out;
      transform-origin: bottom left;
      transform: rotate(-90deg);
    }

    a:hover::before {
      transform: rotate(0deg);
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

b. 滑入

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      border: 3px solid black;
      padding: 30px 80px;
      font-size: 30px;
      font-weight: bolder;
      color: #ff7777;
      position: relative;
      overflow: hidden;
      transition: all 1s ease-out;
    }

    a::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: #ff7777;
      z-index: -1;
      transition: all 0.5s ease-out;
      transform: translateX(-100%);
    }

    a:hover {
      color: white;
    }

    a:hover::before {
      transform: translateX(0);
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

带入文字

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      border: 3px solid black;
      padding: 30px 80px;
      font-size: 30px;
      font-weight: bolder;
      color: #ff7777;
      position: relative;
      overflow: hidden;
    }

    a::before {
      content: "YEAH!";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: #ff7777;
      color: white;
      transition: all 0.5s ease-out;
      transform: translateY(-100%);

      display: flex;
      align-items: center;
      justify-content: center;
    }

    a:hover::before {
      transform: translateY(0);
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

伪闪光滑入

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      background-color: #333;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      border: 3px solid black;
      padding: 30px 80px;
      font-size: 30px;
      font-weight: bolder;
      color: #ff7777;
      position: relative;
      overflow: hidden;
      transition: all 0.5s ease-out;
    }

    a::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 50%;
      background-color: white;
      z-index: -1;
      transition: all 0.5s ease-out;
      transform: translateX(-100%) rotate(45deg);
    }

    a:hover {
      background-color: #ff7777;
      color: white;
    }

    a:hover::before {
      transform: translateX(100%) rotate(45deg);
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

c. 十字扩展（三维变换）

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      border: 3px solid black;
      padding: 30px 80px;
      font-size: 30px;
      font-weight: bolder;
      color: #ff7777;
      position: relative;
      overflow: hidden;
      transition: all 1s ease-out;
    }

    a::before,
    a::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: #ff7777;
      z-index: -1;
      transition: all 0.5s ease-out;
    }

    a::before {
      transform: rotateX(90deg);
    }

    a::after {
      transform: rotateY(90deg);
    }

    a:hover {
      color: white;
    }

    a:hover::before {
      transform: rotateX(0);
    }

    a:hover::after {
      transform: rotateY(0);
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

文字放大退出

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      perspective: 500px;
      text-decoration: none;
      margin: auto;
      border: 3px solid black;
      padding: 30px 80px;
      font-size: 30px;
      font-weight: bolder;
      color: #ff7777;
      position: relative;
      overflow: hidden;
      transition: all 0.5s ease-out;
    }

    a::before {
      content: "Hover me";
      font-size: 30px;
      font-weight: bolder;
      color: white;
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: #ff7777;
      z-index: -1;
      transition: all 0.5s ease-out;
      transform: translateZ(800px);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    a:hover {
      color: white;
    }

    a:hover::before {
      transform: translateZ(0);
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

切牌

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      border: 3px solid black;
      padding: 30px 80px;
      font-size: 30px;
      font-weight: bolder;
      color: transparent;
      position: relative;
      overflow: hidden;
    }

    a::before,
    a::after {
      content: "Hover me";
      font-size: 30px;
      font-weight: bolder;
      color: white;
      position: absolute;
      top: 0;
      width: 100%;
      height: 100%;
      background-color: #ff7777;
      transition: all 0.5s ease-out;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    a::before {
      left: 0;
    }

    a::after {
      left: -100%;
    }

    a::before {
      transform: rotateY(0deg) scale(1);
    }

    a::after {
      transform: rotateY(360deg) scale(0);
    }

    a:hover::before {
      left: 100%;
      transform: rotateY(360deg) scale(0);
      opacity: 0;
    }

    a:hover::after {
      left: 0;
      transform: rotateY(0) scale(1);
      opacity: 1;
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

d. 点入后放大

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      padding: 30px;
      font-size: 30px;
      font-weight: bolder;
      color: #ff7777;
      position: relative;
      overflow: hidden;
      transition: all 0.5s ease-out 0.5s;
    }

    a::before,
    a::after {
      content: "";
      position: absolute;
      top: 50%;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      transform: translateY(-50%);
      background-color: transparent;
      z-index: -1;
      transition: all 0.5s ease-out;
    }

    a::before {
      left: 0;
      box-shadow: -100px 0 0 #ff7777;
    }

    a::after {
      right: 0;
      box-shadow: 100px 0 0 #ff7777;
    }

    a:hover {
      color: white;
      background-color: #ff7777;
    }

    a:hover::before {
      left: 50%;
      background-color: #ff7777;
      box-shadow: -30px 0 0 #ff7777;
      transform: translateX(-50%) translateY(-50%);
    }

    a:hover::after {
      right: 50%;
      background-color: #ff7777;
      box-shadow: 30px 0 0 #ff7777;
      transform: translateX(50%) translateY(-50%);
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

f. 取景框

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      display: flex;
    }

    a {
      text-decoration: none;
      margin: auto;
      padding: 30px;
      font-size: 30px;
      font-weight: bolder;
      color: #ff7777;
      position: relative;
      transition: all 0.5s ease-out 0.5s;
    }

    a::before,
    a::after {
      content: "";
      position: absolute;
      width: 30px;
      height: 30px;
      background-color: transparent;
      z-index: -1;
      transition: all 0.5s ease-out;
    }

    a::before {
      top: -5px;
      left: -5px;
      border-top: 3px solid #ff7777;
      border-left: 3px solid #ff7777;
    }

    a::after {
      right: -5px;
      bottom: -5px;
      border-right: 3px solid #ff7777;
      border-bottom: 3px solid #ff7777;
    }

    a:hover {
      color: white;
      background-color: #ff7777;
    }

    a:hover::before,
    a:hover::after {
      width: 100%;
      height: 100%;
    }
  </style>
</head>

<body>
  <a>Hover me</a>
</body>

</html>

0x03 动画与关键帧 animation & keyframes

（1）基本使用

使用步骤：
1. 定义 CSS 动画规则（即关键帧）
2. 将该动画添加到需要动画的元素上
@keyframes identifier：定义关键帧
animation-name：通过名称使用相应的动画
animation-duration：动画持续时间

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    div {
      width: 100px;
      height: 100px;
      display: block;
      background-color: #ff7777;
    }

    div:hover {
      animation-name: moving;
      animation-duration: 3s;
    }

    @keyframes moving {
      0% {
        transform: translate(0);
      }

      30% {
        transform: translate(150px);
      }

      100% {
        transform: translate(300px);
      }
    }
  </style>
</head>

<body>
  <div></div>
</body>

</html>

（2）其他属性

animation-fill-mode：填充模式，设置 CSS 动画在执行之前和之后如何将样式应用于其目标（详解）
- none、forward、backward、both
animation-iteration-count：迭代次数，设置 CSS 动画重复执行次数
- 取值 infinite 表示无限重复
animation-timing-function：时序函数，与 transition-timing-function 类似
animation-direction：动画方向
- reverse：逆向
- alternate：交替
- alternate-reverse：逆向交替
animation-delay：延时

（3）缩写属性

animation: name duration ...args

...args 表示其他属性，没有规定顺序

（4）案例：牛顿摆

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <style>
    body {
      height: 100vh;
      background-color: #333;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    div {
      display: flex;
      border-top: 10px solid white;
    }

    span {
      display: block;
      width: 3px;
      height: 300px;
      background-color: white;
      margin: 0 30px;
      position: relative;
      transform-origin: top;
    }

    span::before {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 60px;
      aspect-ratio: 1;
      border-radius: 50%;
      background-color: white;
      transform: translateX(-50%);
    }

    span:first-child {
      animation: left 2s ease-in infinite;
    }

    span:last-child {
      animation: right 2s ease-in infinite;
    }

    @keyframes left {
      0% { transform: rotate(0deg); }
      25% { transform: rotate(60deg); }
      50% { transform: rotate(0deg); }
      100% { transform: rotate(0deg); }
    }

    @keyframes right {
      0% { transform: rotate(0deg); }
      50% { transform: rotate(0deg); }
      75% { transform: rotate(-60deg); }
      100% { transform: rotate(0deg); }
    }
  </style>
</head>

<body>
  <div>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
  </div>
</body>

</html>

-End-

标签：动画,专题,color,transition,transform,ff7777,height,background,CSS
From： https://www.cnblogs.com/SRIGT/p/18318668

CSS 动画专题

0x01 过渡 transition

（1）必要属性

（2）其他属性

（3）缩写属性

0x02 变换 transform

（1）scale

（2）translate

（3）rotate

（4）skew

（5）案例

a. 旋入

b. 滑入

c. 十字扩展（三维变换）

d. 点入后放大

f. 取景框

0x03 动画与关键帧 animation & keyframes

（1）基本使用

（2）其他属性

（3）缩写属性

（4）案例：牛顿摆

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