javascript - 为什么 CSS 动画突然结束？

Question

我正在尝试为 block 制作字幕动画，动画应该是“无限的”。但是有一个问题是动画在一段时间后突然结束并突然开始。大约 6 秒的动画后，您可以看到 block “抽搐”，我假设这是 css 动画从 100% 变为 0% 的时候？任何建议如何使它“无限”？我不介意使用 JS 或其他任何方法来解决问题。代码笔:https://codepen.io/1818/pen/WVOKMK

const root = document.documentElement;
const marqueeElementsDisplayed = getComputedStyle(root).getPropertyValue("--marquee-elements-displayed");
const marqueeContent = document.querySelector("ul.marquee-content");

root.style.setProperty("--marquee-elements", marqueeContent.children.length);

for(let i=0; i<marqueeElementsDisplayed; i++) {
  marqueeContent.appendChild(marqueeContent.children[i].cloneNode(true));
}

:root {
  --marquee-width: 80vw;
  --marquee-height: 20vh;
  /* --marquee-elements: 12; */ /* defined with JavaScript */
  --marquee-elements-displayed: 3;
  --marquee-element-width: calc(var(--marquee-width) / var(--marquee-elements-displayed));
  --marquee-animation-duration: calc(var(--marquee-elements) * 0.5s);
}

.marquee {
  width: var(--marquee-width);
  height: var(--marquee-height);
  background-color: #111;
  color: #eee;
  overflow: hidden;
  position: relative;
}
.marquee:before, .marquee:after {
  position: absolute;
  top: 0;
  width: 10rem;
  height: 100%;
  content: "";
  z-index: 1;
}
.marquee:before {
  left: 0;
  background: linear-gradient(to right, #111 0%, transparent 100%);
}
.marquee:after {
  right: 0;
  background: linear-gradient(to left, #111 0%, transparent 100%);
}
.marquee-content {
  list-style: none;
  height: 100%;
  display: flex;
  animation: scrolling var(--marquee-animation-duration) linear infinite;
}
/* .marquee-content:hover {
  animation-play-state: paused;
} */
@keyframes scrolling {
  0% { transform: translateX(calc(-1 * var(--marquee-element-width) * var(--marquee-elements))); }
  100% { transform: translateX(0); }
}
.marquee-content li {
  display: flex;
  justify-content: center;
  align-items: center;
  /* text-align: center; */
  flex-shrink: 0;
  width: var(--marquee-element-width);
  max-height: 100%;
  font-size: calc(var(--marquee-height)*3/4); /* 5rem; */
  white-space: nowrap;
}

.marquee-content li img {
  width: 100%;
  /* height: 100%; */
  border: 2px solid #eee;
}

@media (max-width: 600px) {
  html { font-size: 12px; }
  :root {
    --marquee-width: 100vw;
    --marquee-height: 16vh;
    --marquee-elements-displayed: 1;
  }
  .marquee:before, .marquee:after { width: 5rem; }
}

/* STYLES */
.marquee-content li, .marqueetwo-content li, .marqueethree-content li {
margin: 20px 20px 20px 20px!important;
background: #fff;
height: 301px;
width: 536px!important;
border-radius: 10px;
}

.marquee, .marqueetwo, .marqueethree {
width: auto!important;
height: auto!important;
}

 <div class="marquee">
    <ul class="marquee-content">
      <li><i class="fab fa-github"></i></li>
      <li><i class="fab fa-codepen"></i></li>
      <li><i class="fab fa-free-code-camp"></i></li>
      <li><i class="fab fa-dev"></i></li>
      <li><i class="fab fa-react"></i></li>
      <li><i class="fab fa-vuejs"></i></li>
      <li><i class="fab fa-angular"></i></li>
      <li><i class="fab fa-node"></i></li>
      <li><i class="fab fa-wordpress"></i></li>
      <li><i class="fab fa-aws"></i></li>
      <li><i class="fab fa-docker"></i></li>
      <li><i class="fab fa-android"></i></li>
    </ul>
  </div>

Answer 1

您的计算存在一些问题，我已解决如下问题:

• 有一个应用于 ul 的默认填充/边距需要删除
• 您需要在每个选取框元素的宽度计算中考虑边距
• 我将容器制作成 inline-flex，这样它就适合它的内容，您可以考虑转换中的百分比值，而不是复杂的公式。

我删除了一些代码，只保留了相关的代码

const root = document.documentElement;
const marqueeElementsDisplayed = getComputedStyle(root).getPropertyValue("--marquee-elements-displayed");
const marqueeContent = document.querySelector("ul.marquee-content");

root.style.setProperty("--marquee-elements", marqueeContent.children.length);

for(let i=0; i<marqueeElementsDisplayed; i++) {
  marqueeContent.appendChild(marqueeContent.children[i].cloneNode(true));
}

:root {
  --marquee-width: 100vw;
  --marquee-height: 100vh;
  /* --marquee-elements: 12; */ /* defined with JavaScript */
  --marquee-elements-displayed: 3;
  --marquee-element-width: calc(var(--marquee-width) / var(--marquee-elements-displayed));
  --marquee-animation-duration: calc(var(--marquee-elements) * 0.5s);
}
body {
 margin:0;
}
.marquee {
  width: var(--marquee-width);
  height: var(--marquee-height);
  background-color: #111;
  color: #eee;
  overflow: hidden;
  position: relative;
}
.marquee:before, .marquee:after {
  position: absolute;
  top: 0;
  width: 10rem;
  height: 100%;
  content: "";
  z-index: 1;
}
.marquee:before {
  left: 0;
  background: linear-gradient(to right, #111 0%, transparent 100%);
}
.marquee:after {
  right: 0;
  background: linear-gradient(to left, #111 0%, transparent 100%);
}
.marquee-content {
  list-style: none;
  height: 100%;
  display: inline-flex; /* added this */
  padding:0; /* added this */
  margin:0; /* added this */
  animation: scrolling var(--marquee-animation-duration) linear infinite;
}

@keyframes scrolling {
  0% { transform: translateX(calc(-100% + var(--marquee-width))); } /* modified this*/
  100% { transform: translateX(0); }
}
.marquee-content li {
  margin:20px;
  flex-shrink: 0;
  width: calc(var(--marquee-element-width) - 40px); /* Modified this */
  font-size: calc(var(--marquee-height)*3/4); /* 5rem; */
  background:#fff;
  border-radius: 10px;
}

<div class="marquee">
    <ul class="marquee-content">
      <li><i class="fab fa-github"></i></li>
      <li><i class="fab fa-codepen"></i></li>
      <li><i class="fab fa-free-code-camp"></i></li>
      <li><i class="fab fa-dev"></i></li>
      <li><i class="fab fa-react"></i></li>
      <li><i class="fab fa-vuejs"></i></li>
      <li><i class="fab fa-angular"></i></li>
      <li><i class="fab fa-node"></i></li>
      <li><i class="fab fa-wordpress"></i></li>
      <li><i class="fab fa-aws"></i></li>
      <li><i class="fab fa-docker"></i></li>
      <li><i class="fab fa-android"></i></li>
    </ul>
  </div>