优化滑动动画：解决页面元素过渡时的闪烁问题

本文旨在解决网页开发中常见的滑动动画不流畅问题，特别是页面元素（如顶部面板）在滑动消失时出现的短暂空白或闪烁现象。我们将深入探讨问题根源，并提供多种解决方案，包括使用`position: sticky`、CSS Transitions和Web Animations API，以实现更平滑、更专业的动画效果。

问题分析

在实现滑动动画时，如果动画不同步或元素定位不当，可能会导致视觉上的不流畅，出现短暂的空白或闪烁。常见原因包括：

动画不同步： 顶部面板和主体内容移动的距离或时间不一致。定位问题： 使用position: fixed可能导致元素在不同屏幕尺寸下重叠或出现间隙。性能问题： 复杂的动画或频繁的重绘可能导致性能瓶颈。

解决方案

以下介绍几种解决滑动动画不流畅问题的方案，并提供相应的代码示例。

1. 使用 position: sticky

position: sticky 是一种更优雅的解决方案，它结合了 position: relative 和 position: fixed 的特性。当元素在视口中时，它表现为 relative，当滚动到特定位置时，它会变为 fixed。

优点：

无需 JavaScript 即可实现固定定位效果。避免了 fixed 定位可能导致的元素重叠问题。动画效果更流畅，视觉抖动更少。

实现步骤：

千面视频动捕

千面视频动捕是一个AI视频动捕解决方案，专注于将视频中的人体关节二维信息转化为三维模型动作。

27 查看详情 将顶部面板的 position 设置为 sticky，top 设置为 0。通过修改 margin-bottom 和 transform: translateY() 来实现面板的滑动隐藏。

代码示例：

HTML:

  
    
      
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CSS:

.panel{  z-index: 1;  position: sticky;  top: 0;  transition:    margin-bottom 1s,    transform 1s;}.hero {  position: relative;}*{  margin:0;  padding:0;}html {--smokeGrey:#eee}.notif-panel{  display:grid;  grid-template-columns: 1fr;  grid-template-rows: 1fr;  grid-template-areas: "panel-content";}.panel-content{  display:flex;  justify-content:center;  align-items:center;  background-color:var(--smokeGrey);}.panel-text{  display:inline;}.cookie, .privacy, .tos{  text-decoration:none;}.panel-button{  display:inline;  padding: 10px 16px;  background-color: #007bc1;  color: white;  border: none;  border-radius: 2px;}.panel-button:hover{  background-image: linear-gradient(rgba(0, 0, 0, 0.1) 0 0);}@media(max-width:675px){  .notif-panel{    height: 10%;  }  .panel-content{    padding: 0 5px;  }  .panel-text{    padding-right: 15px;  }  .panel-button{    font-size: 17px;}}@media(max-width:605px){  .notif-panel{    height: 15%;  }  .panel-content{    align-items: left;    display: block;    padding: 10px;    font-size: 18px;  }  .panel-text{    padding-bottom: 10px;    display: block;  }  .panel-button{    font-size: 17px;}}.main-page{  width: 100%;}.hero{  display: flex;  justify-content: center;  align-items: center;  background-image: linear-gradient(rgba(0,74,117,.52),rgba(0,74,117,.52)), url('assets/work-desk__dustin-lee.jpg');  height: 600px;}.logo{  height: 50px;  width: 50px;  position: absolute;  left: 30px;  top: 25px;}.hero-content{  margin:0;  text-align: center;  color: white;}.name{  font-size: 30px;}.contact-text{  margin-top: 8px;  padding-bottom: 25px;}.contact-button{  font-weight: bold;  color: white;  background-color: transparent;  border: white 2px solid;  padding: 12px 15px;  border-radius: 2px;}.contact-button:hover{  color: var(--blue);  background-color: white;}

JavaScript:

const panel = document.getElementById('panel');const page = document.getElementById('main-page');function closePanel(){  const {bottom} = panel.getBoundingClientRect();  panel.style.marginBottom = 0 + "px";  panel.addEventListener("transitionend", () => panel.replaceWith());  // marginBottom shrinks the element;  // translateY() slides it out.  setTimeout(() => {    panel.style.marginBottom = `${-bottom}px`;    panel.style.transform = `translateY(${-bottom}px)`;  }, 0);}

2. 使用 CSS Transitions

CSS Transitions 允许您在 CSS 属性值更改时平滑地过渡。

实现步骤：

获取顶部面板的初始高度。设置顶部面板和主体内容的 transition 属性。在 JavaScript 中，同时修改顶部面板的 top 属性和主体内容的 top 属性。

代码示例：

HTML:

  
    
      
By accessing and using this website, you acknowledge that you have read and understand our        Cookie Policy,        Privacy Policy, and our        Terms of Service.      
      Got it    
  
  
            
          
Hello! I'm Dylan Anderton
          
Consult, Design, and Develop Websites
          
Have something great in mind? Feel free to contact me.
 I'll help you to make it happen.
          LET'S MAKE CONTACT      
  

CSS:

/* I had to move position:fixed to this top-level element */.panel{  z-index: 1;  position: fixed;}*{  margin:0;  padding:0;}html {--smokeGrey:#eee}.notif-panel{  display:grid;  grid-template-columns: 1fr;  grid-template-rows: 1fr;  grid-template-areas: "panel-content";}.panel-content{  display:flex;  justify-content:center;  align-items:center;  background-color:var(--smokeGrey);}.panel-text{  display:inline;}.cookie, .privacy, .tos{  text-decoration:none;}.panel-button{  display:inline;  padding: 10px 16px;  background-color: #007bc1;  color: white;  border: none;  border-radius: 2px;}.panel-button:hover{  background-image: linear-gradient(rgba(0, 0, 0, 0.1) 0 0);}@media(max-width:675px){  .notif-panel{    height: 10%;  }  .panel-content{    padding: 0 5px;  }  .panel-text{    padding-right: 15px;  }  .panel-button{    font-size: 17px;}}@media(max-width:605px){  .notif-panel{    height: 15%;  }  .panel-content{    align-items: left;    display: block;    padding: 10px;    font-size: 18px;  }  .panel-text{    padding-bottom: 10px;    display: block;  }  .panel-button{    font-size: 17px;}}.main-page{  position: absolute;  width: 100%;}.hero{  display: flex;  justify-content: center;  align-items: center;  background-image: linear-gradient(rgba(0,74,117,.52),rgba(0,74,117,.52)), url('assets/work-desk__dustin-lee.jpg');  height: 600px;}.logo{  height: 50px;  width: 50px;  position: absolute;  left: 30px;  top: 25px;}.hero-content{  margin:0;  text-align: center;  color: white;}.name{  font-size: 30px;}.contact-text{  margin-top: 8px;  padding-bottom: 25px;}.contact-button{  font-weight: bold;  color: white;  background-color: transparent;  border: white 2px solid;  padding: 12px 15px;  border-radius: 2px;}.contact-button:hover{  color: var(--blue);  background-color: white;}

JavaScript:

const panel = document.getElementById('panel');const page = document.getElementById('main-page');function closePanel(){  const rectPanel = panel.getBoundingClientRect();  panel.style.top = 0;  page.style.top = rectPanel.bottom + "px";  panel.style.transition = "top 1s ease-in-out";  page.style.transition = "top 1s ease-in-out";  // Don't forget to remove it from the DOM  panel.addEventListener("transitionend", () => panel.replaceWith());  setTimeout(() => {    panel.style.top = -rectPanel.bottom + "px";    page.style.top = 0;  }, 0);}

3. 使用 Web Animations API

Web Animations API 提供了更强大的动画控制能力，允许您创建更复杂的动画效果。

实现步骤：

获取顶部面板的初始高度。使用 element.animate() 方法创建动画。设置动画的关键帧和持续时间。

代码示例：

HTML:

  
    
      
By accessing and using this website, you acknowledge that you have read and understand our        Cookie Policy,        Privacy Policy, and our        Terms of Service.      
      Got it    
  
  
            
          
Hello! I'm Dylan Anderton
          
Consult, Design, and Develop Websites
          
Have something great in mind? Feel free to contact me.
 I'll help you to make it happen.
          LET'S MAKE CONTACT      
  

CSS:

/* I had to move position:fixed to this top-level element */.panel{  z-index: 1;  position: fixed;}*{  margin:0;  padding:0;}html {--smokeGrey:#eee}.notif-panel{  display:grid;  grid-template-columns: 1fr;  grid-template-rows: 1fr;  grid-template-areas: "panel-content";}.panel-content{  display:flex;  justify-content:center;  align-items:center;  background-color:var(--smokeGrey);}.panel-text{  display:inline;}.cookie, .privacy, .tos{  text-decoration:none;}.panel-button{  display:inline;  padding: 10px 16px;  background-color: #007bc1;  color: white;  border: none;  border-radius: 2px;}.panel-button:hover{  background-image: linear-gradient(rgba(0, 0, 0, 0.1) 0 0);}@media(max-width:675px){  .notif-panel{    height: 10%;  }  .panel-content{    padding: 0 5px;  }  .panel-text{    padding-right: 15px;  }  .panel-button{    font-size: 17px;}}@media(max-width:605px){  .notif-panel{    height: 15%;  }  .panel-content{    align-items: left;    display: block;    padding: 10px;    font-size: 18px;  }  .panel-text{    padding-bottom: 10px;    display: block;  }  .panel-button{    font-size: 17px;}}.main-page{  position: absolute;  width: 100%;}.hero{  display: flex;  justify-content: center;  align-items: center;  background-image: linear-gradient(rgba(0,74,117,.52),rgba(0,74,117,.52)), url('assets/work-desk__dustin-lee.jpg');  height: 600px;}.logo{  height: 50px;  width: 50px;  position: absolute;  left: 30px;  top: 25px;}.hero-content{  margin:0;  text-align: center;  color: white;}.name{  font-size: 30px;}.contact-text{  margin-top: 8px;  padding-bottom: 25px;}.contact-button{  font-weight: bold;  color: white;  background-color: transparent;  border: white 2px solid;  padding: 12px 15px;  border-radius: 2px;}.contact-button:hover{  color: var(--blue);  background-color: white;}

JavaScript:

const panel = document.getElementById('panel');const page = document.getElementById('main-page');function closePanel(){  const {bottom} = panel.getBoundingClientRect();  const duration = 1000; // ms  panel.animate(      { top: [0, `${-bottom}px`] },    { duration }  ).finished.then(() => {    panel.replaceWith(); // Don't forget to remove element from DOM!  });  page.animate(    { top: [`${bottom}px`, 0] },    { duration }  );}

注意事项

同步动画： 确保顶部面板和主体内容的动画持续时间一致。性能优化： 避免复杂的动画效果，尽量使用硬件加速的 CSS 属性（如 transform 和 opacity）。移除元素： 在动画结束后，从 DOM 中移除顶部面板，以避免潜在的性能问题。

总结

通过选择合适的解决方案并遵循最佳实践，您可以有效地解决滑动动画不流畅的问题，从而提升用户体验。position: sticky 是一种简单而有效的方案，而 CSS Transitions 和 Web Animations API 则提供了更强大的动画控制能力。根据您的具体需求和项目复杂度，选择最适合您的解决方案。

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