我正在制作这个网站，当按下“播放”按钮时播放我们的校歌，并在按下“暂停”按钮时暂停。旁边是歌词的“每行”突出显示动画。但是，我无法全局暂停动画。我想暂停音频和 CSS 动画，但只有音频是实际暂停的，因此当我单击播放按钮时，歌词突出显示和音频不再同步。
我尝试过在 CSS 中使用动画播放状态，但效果都不好
抱歉，如果代码很长，因为我做了“每行”歌词，但我想做的是暂停所有动画，以便在我恢复动画时它仍然与音频同步。
.lyrics {
font-weight: lighter;
font-size: 1vw;
}
.l1.an {
animation: tae 1s;
animation-direction: alternate;
animation-duration: 5s;
animation-delay: 12s;
}
.l2.an {
animation: tae 1s;
animation-duration: 5s;
animation-fill-mode: alternate;
animation-delay: 15s;
}
.l3.an {
animation: tae 1s;
animation-duration: 8s;
animation-fill-mode: alternate;
animation-delay: 18s;
}
.l4.an {
animation: tae 1s;
animation-duration: 7s;
animation-fill-mode: alternate;
animation-delay: 24s;
}
.l5.an {
animation: tae 1s;
animation-duration: 8s;
animation-fill-mode: alternate;
animation-delay: 29s;
}
@keyframes tae {
0% {background: initial;}
30% {background: blue;}
60% {background: blue;}
100% {background: initial;}
}<body>
<audio id="ad">
<source src = "pup.mp3" type="audio/mp3">
</audio>
<script type="text/javascript">
var song = document.getElementById("ad");
function togglePlay() {
song.play();
document.getElementByClassName("an").style.animationPlayState = "running"; //this is what I'm currently using in play button
}
function togglePause() {
song.pause();
document.getElementByClassName("an").style.animationPlayState = "paused"; //this is for the pause button
}
</script>
<div class="bg"></div>
<div class="bg-box">
<img src="PUPLogo.png">
<p class="PUP">Polytechnic University of the Philippines</p>
<h1>PUP HYMN</h1>
<p class="lyrics">
<div class="l1 an">Sintang Paaralan</div>
<div class="l2 an">Tanglaw ka ng bayan</div>
<div class="l3 an">Pandayan ng isip ng kabataan</div>
<div class="l4 an">Kami ay dumating nang salat sa yaman<br></div>
<div class="l5 an">Hanap na dunong ay iyong alay<br></div>
<!--I cut the lyrics here to make it shorter-->
<input type="button" value="Play" onclick="togglePlay()" class="but" ></input>
<input type="button" value="Pause" onclick="togglePause()" class="but"></input>
</div>
</body>
</html>最佳答案
首先，您需要使用 getElementsByClassName 而不是 getElementByClassName
第二个注意事项是，当您通过类选择器选择元素时，必须循环遍历这些元素。所以我在类“an”的元素上编写了一个循环:
var song = document.getElementById("ad");
function togglePlay() {
song.play();
Array.from(document.getElementsByClassName("an")).forEach(
function(element, index, array) {
element.style.animationPlayState = "running";
}
)
}
function togglePause() {
song.pause();
Array.from(document.getElementsByClassName("an")).forEach(
function(element, index, array) {
element.style.animationPlayState = "paused";
}
)
}.lyrics {
font-weight: lighter;
font-size: 1vw;
}
.l1.an {
animation: tae 1s;
animation-direction: alternate;
animation-duration: 5s;
animation-delay: 12s;
}
.l2.an {
animation: tae 1s;
animation-duration: 5s;
animation-fill-mode: alternate;
animation-delay: 15s;
}
.l3.an {
animation: tae 1s;
animation-duration: 8s;
animation-fill-mode: alternate;
animation-delay: 18s;
}
.l4.an {
animation: tae 1s;
animation-duration: 7s;
animation-fill-mode: alternate;
animation-delay: 24s;
}
.l5.an {
animation: tae 1s;
animation-duration: 8s;
animation-fill-mode: alternate;
animation-delay: 29s;
}
@keyframes tae {
0% {background: initial;}
30% {background: blue;}
60% {background: blue;}
100% {background: initial;}
}<!doctype html>
<html>
<head>
<link rel="stylesheet" href="css1.css">
<meta charset="utf-8" content="width=device-width, initial-scale=1.0">
<meta http-equiv="refresh" content="106">
<title>PUP HYMN</title>
</head>
<body>
<audio id="ad">
<source src = "pup.mp3" type="audio/mp3">
</audio>
<div class="bg"></div>
<div class="bg-box">
<img src="PUPLogo.png">
<p class="PUP">Polytechnic University of the Philippines</p>
<h1>PUP HYMN</h1>
<p class="lyrics">
<div class="l1 an">Sintang Paaralan</div>
<div class="l2 an">Tanglaw ka ng bayan</div>
<div class="l3 an">Pandayan ng isip ng kabataan</div>
<div class="l4 an">Kami ay dumating nang salat sa yaman<br></div>
<div class="l5 an">Hanap na dunong ay iyong alay<br></div>
<!--I cut the lyrics here to make it shorter-->
<input type="button" value="Play" onclick="togglePlay()" class="but" ></input>
<input type="button" value="Pause" onclick="togglePause()" class="but"></input>
</div>
</body>
</html>关于javascript - 如何暂停所有 CSS 动画并在需要时恢复，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54124107/