2021年3月7日星期日

实现 3D 时间动画展示效果

搭建舞台

<!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" /> <title>Document</title> <style type="text/css">  html,  body {  width: 100%;  height: 100%;  background-color: #000;  overflow: hidden;  }  /* 设置视距1000px 子元素在3D中变换 */  .preserve {  transform-style: preserve-3d;  perspective: 1000px;  }  /* 容器 */  .container {  position: relative;  margin-top: 10vh;  text-align: center;  /* animation: rotateReverse 10s infinite linear; */  }  /* 舞台 */  .stage {  transform: rotateX(10deg) rotateZ(0);  /* animation: rotate 10s infinite linear; */  }  /* 数字样式 */  .number {  position: relative;  width: 3vw;  height: 12vw;  display: inline-block;  margin: 3vw 3vw 0 0;  }  .line {  position: absolute;  top: 0;  left: 0;  width: 3vw;  height: 2px;  background: #181919;  }  .line::before,  .line::after {  content: "";  position: absolute;  top: 0;  width: 50%;  height: 100%;  background-color: #34eabc;  box-shadow: 0 0 1vw #0bfdfd, inset 0 0 0.125vmin #0bfdfd;  }  .line::before {  left: 0;  transition: all 0.5s ease-in;  }  .line::after {  right: 0;  transition: all 0.5s ease-out;  }  /* 计算每根线的位置 */  .line:nth-child(1) {  top: -0.2vw;  }  .line:nth-child(2) {  top: 3.2vw;  }  .line:nth-child(3) {  top: 6.6vw;  }  .line:nth-child(4) {  transform: rotate(90deg) translateY(0.2vw);  /* 设置 旋转中心为 最左边 元素中点 */  transform-origin: 0 center;  }  .line:nth-child(5) {  transform: rotate(-90deg) translateY(0.2vw);  /* 设置 旋转中心为 最右边 元素中点 */  transform-origin: 100% center;  }  .line:nth-child(6) {  top: 3.4vw;  transform: rotate(90deg) translateY(0.2vw);  transform-origin: 0 center;  }  .line:nth-child(7) {  top: 3.4vw;  transform: rotate(-90deg) translateY(0.2vw);  transform-origin: 100% center;  }  /* 减少我们的距离 实现阴影效果 */  .translate::before,  .translate::after {  transform: translateZ(50px);  } </style> </head> <body> <div class="container preserve">  <div class="stage preserve">  <div class="number preserve">   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>  </div>  </div> </div> </body></html>复制代码
  • 确认组成数字需要多少个块元素
  • 使用伪元素和元素的颜色差，让伪元素向我们的方向移动，实现影子效果。
  • 使用transform属性，计算每一个块元素的位置组成一个数字。

添加数字变换动画

...  .number[data-digit="1"] .line:nth-child(1)::before,  .number[data-digit="1"] .line:nth-child(1)::after,  .number[data-digit="1"] .line:nth-child(2)::before,  .number[data-digit="1"] .line:nth-child(2)::after,  .number[data-digit="1"] .line:nth-child(3)::before,  .number[data-digit="1"] .line:nth-child(3)::after,  .number[data-digit="1"] .line:nth-child(4)::before,  .number[data-digit="1"] .line:nth-child(4)::after,  .number[data-digit="1"] .line:nth-child(6)::before,  .number[data-digit="1"] .line:nth-child(6)::after,  .number[data-digit="2"] .line:nth-child(4)::before,  .number[data-digit="2"] .line:nth-child(4)::after,  .number[data-digit="2"] .line:nth-child(7)::before,  .number[data-digit="2"] .line:nth-child(7)::after,  .number[data-digit="3"] .line:nth-child(4)::before,  .number[data-digit="3"] .line:nth-child(4)::after,  .number[data-digit="3"] .line:nth-child(6)::before,  .number[data-digit="3"] .line:nth-child(6)::after,  .number[data-digit="4"] .line:nth-child(1)::before,  .number[data-digit="4"] .line:nth-child(1)::after,  .number[data-digit="4"] .line:nth-child(3)::before,  .number[data-digit="4"] .line:nth-child(3)::after,  .number[data-digit="4"] .line:nth-child(6)::before,  .number[data-digit="4"] .line:nth-child(6)::after,  .number[data-digit="5"] .line:nth-child(5)::before,  .number[data-digit="5"] .line:nth-child(5)::after,  .number[data-digit="5"] .line:nth-child(6)::before,  .number[data-digit="5"] .line:nth-child(6)::after,  .number[data-digit="6"] .line:nth-child(5)::before,  .number[data-digit="6"] .line:nth-child(5)::after,  .number[data-digit="7"] .line:nth-child(2)::before,  .number[data-digit="7"] .line:nth-child(2)::after,  .number[data-digit="7"] .line:nth-child(3)::before,  .number[data-digit="7"] .line:nth-child(3)::after,  .number[data-digit="7"] .line:nth-child(4)::before,  .number[data-digit="7"] .line:nth-child(4)::after,  .number[data-digit="7"] .line:nth-child(6)::before,  .number[data-digit="7"] .line:nth-child(6)::after,   .number[data-digit="9"] .line:nth-child(6)::before,  .number[data-digit="9"] .line:nth-child(6)::after,   .number[data-digit="0"] .line:nth-child(2)::before,  .number[data-digit="0"] .line:nth-child(2)::after {  transform: translateZ(25px);  background: #3c4444;  box-shadow: 0 0 1vw #425454;  } ...  <script type="text/javascript">  (function () {  let numbers = document.getElementsByClassName("number")  setInterval(() => {   Array.prototype.slice.call(numbers).forEach((key) => {   key.setAttribute("data-digit",parseInt(Math.random() * 9));   });  }, 1000);  })() </script>...复制代码
  • 使用transition属性给line::before和line::after设置过度动画。
  • 通过css属性选择器，获取自定义属性的值。通过变换的值来设置在不同数字下，哪些块需要改变。
  • 使用js修改自定义属性的值。

加入时间

...  .colon{  position: relative;  display: inline-block;  width: 2vw;  height: 12vw;  margin: 1vw 2vw 0 0;  animation:colonFra 1s linear infinite ;  }  .colon::before {  content: "";  position: absolute;  top: 0;  left: 0;  width: 1vw;  height: 1vw;  background-color: #34eabc;  border-radius: 50%;  }  .colon::after {  content: "";  position: absolute;  top: 4vw;  left: 0;  width: 1vw;  height: 1vw;  background-color: #34eabc;  border-radius: 50%;  }  .colonS{  left: -1.3vw;  }  .colonF{  left: 1vw;  }  @keyframes colonFra {  0% {   opacity: 0;  }  100% {   opacity: 1;  }  }...  <div class="number preserve" data-digit="0">   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>  </div>  <div class="colon preserve colonS"></div>  <div class="number preserve" data-digit="0">   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>  </div>  <div class="number preserve" data-digit="0">   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>  </div>  <div class="colon preserve colonF"></div>  <div class="number preserve" data-digit="0">   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>  </div>  <div class="number preserve" data-digit="0">   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>   <div class="line preserve translate"></div>  </div>... <script type="text/javascript">  function time(){  let timeTem = new Date();  let a = timeTem.getHours().toString().substring(0,1);  let b = timeTem.getHours().length > 1 ? 0 : timeTem.getHours().toString().substring(1,2);  let c = timeTem.getMinutes().toString().substring(0,1);  let d = timeTem.getMinutes().length > 1 ? 0 : timeTem.getMinutes().toString().substring(1,2);  let e = timeTem.getSeconds().toString().substring(0,1);  let f = timeTem.getSeconds().length > 1 ? 0 : timeTem.getSeconds().toString().substring(1,2);  return [a,b,c,d,e,f]  }  (function () {  let numbers = document.getElementsByClassName("number")  setInterval(() => {   let arr = time();   Array.prototype.slice.call(numbers).forEach((key,index) => {   key.setAttribute("data-digit",arr[index]);   });  }, 1000);  })() </script>复制代码
  • 先定义时分秒钟的，间隔。
  • 使用js获取当前时间，依次修改自定义变量的值。

 


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