带有移动文本的横幅，根据宽度自动调整 div 大小并保留主体宽度

Question

我正在尝试制作带有移动文本的横幅。我想出了一种方法来做到这一点，但不幸的是，我的实现有两个主要问题。我必须根据文本的长度手动调整 px 中的宽度值。它导致车身尺寸在宽度方面更大。我希望身体保持 100%/与窗口相同的大小。知道如何解决这两个问题，或者是否有更好的方法来实现这一点？let txtAnnounce = document.createElement('div');txtAnnounce.style = 'display: block; position: absolute; width: 600px; height: 45px; top: 65px; left: 0px; color: white; line-height: 45px; text-align: center;';txtAnnounce.innerHTML = "Some text blah blah blach... Good for announcements with long text....! :) "document.body.appendChild(txtAnnounce);let txtAnnounce2 = document.createElement('div');txtAnnounce2.style = 'display: block; position: absolute; width: 600px; height: 45px; top: 65px; left: 600px; color: white; line-height: 45px; text-align: center;';txtAnnounce2.innerHTML = "Some text blah blah blach... Good for announcements with long text....! :) "document.body.appendChild(txtAnnounce2);let curLeft = 0;let curLeft2 = 0;setInterval(function() {        curLeft--;        curLeft2--;        if (curLeft < -600) {                curLeft = 0;        }        if (curLeft2 < 0) {                curLeft2 = 600;        }        txtAnnounce.style.left = curLeft.toString() + 'px';        txtAnnounce2.style.left = curLeft2.toString() + 'px';}, 10);<div id="announce" style="position: absolute; display: block; top: 65px; left: 0px; border-bottom: 1px solid #cccccc; height: 45px; width: 100%; background-color: #008aff; color: white; text-align: center; line-height: 45px; font-family: Arial, Helvetica, sans-serif;"></div>

Answer 1

您甚至可以尝试使用 CSS 动画并根据设备的视口定义容器大小。

overflow: hidden 保留公告 - 包含在公告容器中的文本。

.announcement {

  background:  #008aff;

  padding: 15px;

  color: white;

  overflow: hidden;

}

.announcement--text {

  position: relative;

  left: 100vw;

  white-space: nowrap;

  animation: move 10s infinite;

  animation-timing-function: linear;

}

@keyframes move {

  from {left: 100vw;}

  to {left: -100vw;} //maximum length of your announcement

}

<div class="announcement">

  <div class="announcement--text">Some text blah blah blach... Good for announcements with long text....! </div>

</div>