如何正确使用关键帧动画？

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【中文标题】如何正确使用关键帧动画？【英文标题】：How to properly use keyframes animation? 【发布时间】：2020-12-22 17:30:31 【问题描述】：

我试图让 div 在页面加载时一个接一个地出现。问题是这个设置只有在我向 div 选择器添加 visibility: hidden 属性时才有效，这反过来又会反转动画。我错过了什么？

* 
  box-sizing: border-box;
  margin: 0;
  padding: 0;


body 
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100vh;
  background-color: rgb(73, 73, 73);


div 
  width: 15vh;
  height: 15vh;
  background-color: rgb(53, 53, 53);


.box1 
  animation: test 1s;


.box2 
  animation: test 1.1s;


.box3 
  animation: test 1.2s;


.box4 
  animation: test 1.3s;


.box5 
  animation: test 1.4s;


@keyframes test 
  from 
    visibility: hidden;
  
  to 
    visibility: visible;
  

<div class="box1"></div>
<div class="box2"></div>
<div class="box3"></div>
<div class="box4"></div>
<div class="box5"></div>

【问题讨论】：

visibility 无法设置动画。更改为opacity: 0 和opacity: 1，你的动画就可以正常工作了。 @Turnip 这不是我想要的工作方式。我不希望它淡入，而是弹出。 正如@Turnip 所说，使用visibility 以这种方式对其进行动画处理是不可能的。见***.com/questions/27900053/… 【参考方案1】：

您需要为不透明度设置动画以使项目出现 - 您可以将长度设置为 1%，这样它只会“弹出”而不是淡入。

我还将animation-fill-mode 设置为forwards，以便保持最终状态并使用animation-delay 设置每个盒子弹出之间的时间

* 
  box-sizing: border-box;
  margin: 0;
  padding: 0;


body 
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100vh;
  background-color: rgb(73, 73, 73);


div 
  width: 15vh;
  height: 15vh;
  background-color: rgb(53, 53, 53);


.box 
  opacity: 0;
  animation: test 0.1s forwards;


.box1 
  animation-delay: 1s;


.box2 
  animation-delay: 1.1s;


.box3 
  animation-delay: 1.2s;


.box4 
  animation-delay: 1.3s;


.box5 
  animation-delay: 1.4s;


@keyframes test 
  0% 
    opacity: 0;
  
  99% 
    opacity: 0;
  
  100% 
    opacity: 1;
  

<div class="box box1"></div>
<div class="box box2"></div>
<div class="box box3"></div>
<div class="box box4"></div>
<div class="box box5"></div>

【讨论】：

【参考方案2】：

请将visibility: hidden;添加到每个盒子

* 
  box-sizing: border-box;
  margin: 0;
  padding: 0;


body 
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100vh;
  background-color: rgb(73,73,73);


div 
  width: 15vh;
  height: 15vh;
  background-color: rgb(53,53,53);


.box1
  visibility: hidden;
  animation: test 1s;


.box2
  visibility: hidden;
  animation: test 1.1s;


.box3
  visibility: hidden;
  animation: test 1.2s;


.box4
  visibility: hidden;
  animation: test 1.3s;


.box5
  visibility: hidden;
  animation: test 1.4s;


@keyframes test 
  from 
    visibility: hidden;
  

  to 
    visibility: visible;
  

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

  <div class="box1"></div>
  <div class="box2"></div>
  <div class="box3"></div>
  <div class="box4"></div>
  <div class="box5"></div>


</body>
</html>

【讨论】：

【参考方案3】：

因为它是一个加载器，这里有另一个我可以建议你的高度和宽度，无限加载器：

* 
  box-sizing: border-box;
  margin: 0;
  padding: 0;


body 
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100vh;
  background-color: rgb(73,73,73);


div 
  width: 15vh;
  height: 15vh;
  background-color: rgb(53,53,53);


.box1
  width : 15vh;
  height: 15vh;
  animation: test 1s ease 0s infinite;


.box2
  width : 15vh;
  height: 15vh;
  animation: test 1s ease 0.2s infinite;


.box3
  width : 15vh;
  height: 15vh;
  animation: test 1s ease 0.4s infinite;


.box4
  width : 15vh;
  height: 15vh;
  animation: test 1s ease 0.6s infinite;


.box5
  width : 15vh;
  height: 15vh;
  animation: test 1s ease 0.8s infinite;


@keyframes test 
  from 
    height: 15vh;
    width: 15vh;
  

  to 
     height: 0;
    width: 0;
  

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

  <div class="box1"></div>
  <div class="box2"></div>
  <div class="box3"></div>
  <div class="box4"></div>
  <div class="box5"></div>


</body>
</html>

【讨论】：

【参考方案4】：

@Pete 出色的工作。我使用“比例”而不是不透明度。谢谢！

    * 
  box-sizing: border-box;
  margin: 0;
  padding: 0;


body 
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100vh;
  background-color: rgb(73,73,73);


div 
  transform: scale(0);
  width: 15vh;
  height: 15vh;
  background-color: rgb(53,53,53);


.box 
  animation: test 0.4s forwards;


.box1
  animation-delay: 0.2s;


.box2
  animation-delay: 0.4s;


.box3
  animation-delay: 0.6s;


.box4
  animation-delay: 0.8s;


.box5
  animation-delay: 1s;


@keyframes test 
  from 
    transform: scale(0);
  

  to 
    transform: scale(1, 1);
  

<div class="box box1"></div>
<div class="box box2"></div>
<div class="box box3"></div>
<div class="box box4"></div>
<div class="box box5"></div>

【讨论】：

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