优化滑动动画：解决页面元素过渡时的闪烁问题-html教程-PHP中文网

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：

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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:

<div class="panel" id="panel">
  <div class="notif-panel" id="notifPanel">
    <div class="panel-content">
      <p class="panel-text">By accessing and using this website, you acknowledge that you have read and understand our
        <a class="cookie" href="#">Cookie Policy</a>,
        <a class="privacy" href="#">Privacy Policy</a>, and our
        <a class="tos" href="#">Terms of Service</a>.
      </p>
      <button class="panel-button" onclick="closePanel()">Got it</button>
    </div>
  </div>
</div>

<div class="main-page" id="main-page">
  <section class="hero" id="hero">
      <img src="assets/y-logo-white.png" class="logo">
      <div class="hero-content">
          <p class="name">Hello! I'm Dylan Anderton</p>
          <h2 class="slogan">Consult, Design, and Develop Websites</h2>
          <p class="contact-text">Have something great in mind? Feel free to contact me.<br> I'll help you to make it happen.</p>
          <button class="contact-button">LET'S MAKE CONTACT</button>
      </div>
  </section>
</div>

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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;
}

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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);
}

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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:

<div class="panel" id="panel">
  <div class="notif-panel" id="notifPanel">
    <div class="panel-content">
      <p class="panel-text">By accessing and using this website, you acknowledge that you have read and understand our
        <a class="cookie" href="#">Cookie Policy</a>,
        <a class="privacy" href="#">Privacy Policy</a>, and our
        <a class="tos" href="#">Terms of Service</a>.
      </p>
      <button class="panel-button" onclick="closePanel()">Got it</button>
    </div>
  </div>
</div>

<div class="main-page" id="main-page">
  <section class="hero" id="hero">
      <img src="assets/y-logo-white.png" class="logo">
      <div class="hero-content">
          <p class="name">Hello! I'm Dylan Anderton</p>
          <h2 class="slogan">Consult, Design, and Develop Websites</h2>
          <p class="contact-text">Have something great in mind? Feel free to contact me.<br> I'll help you to make it happen.</p>
          <button class="contact-button">LET'S MAKE CONTACT</button>
      </div>
  </section>
</div>

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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;
}

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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);
}

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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:

<div class="panel" id="panel">
  <div class="notif-panel" id="notifPanel">
    <div class="panel-content">
      <p class="panel-text">By accessing and using this website, you acknowledge that you have read and understand our
        <a class="cookie" href="#">Cookie Policy</a>,
        <a class="privacy" href="#">Privacy Policy</a>, and our
        <a class="tos" href="#">Terms of Service</a>.
      </p>
      <button class="panel-button" onclick="closePanel()">Got it</button>
    </div>
  </div>
</div>

<div class="main-page" id="main-page">
  <section class="hero" id="hero">
      <img src="assets/y-logo-white.png" class="logo">
      <div class="hero-content">
          <p class="name">Hello! I'm Dylan Anderton</p>
          <h2 class="slogan">Consult, Design, and Develop Websites</h2>
          <p class="contact-text">Have something great in mind? Feel free to contact me.<br> I'll help you to make it happen.</p>
          <button class="contact-button">LET'S MAKE CONTACT</button>
      </div>
  </section>
</div>

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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;
}

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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 }
  );
}

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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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