如何使用Java脚本停止和启动动画？

debugcn 发表于 Dev

尔凡·埃扎尼（Irfan Ezani）

我试图通过使用香草Javascript来停止该动画。我尝试使用classList.remove属性，但是没有用。当我打开Chrome Dev Tool时，它说它无法读取未定义的属性remove。我不明白它要说的是什么。有没有办法用香草JS删除动画，有人可以显示解决方案吗？

const circle = document.getElementsByClassName('circle')
const red = document.getElementsByClassName('red')
const blue = document.getElementsByClassName('blue')
const yellow = document.getElementsByClassName('yellow')
const green = document.getElementsByClassName('green')
const button = document.getElementById('btn')

button.addEventListener('click', function() {
 circle.classList.remove('red');
 circle.classList.remove('blue');
 circle.classList.remove('yellow');
 circle.classList.remove('green');
})

* {
  box-sizing: border-box;

}

body {
  background: rgb(25, 21, 26);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  overflow: hidden;
}
.utilities {
  position: absolute;
  top : 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.utilities button {
  height: 50px;
  width: 100px;
  background: none;
  color: white;
  outline: none;
  border: 2px solid rgb(184, 134, 222);
  border-radius: 25px;
}

button:hover {
  background: rgb(184, 134, 222);
  cursor: pointer;
  transition: 0.5s ease;
}

.main {
  background:rgb(57, 53, 75);
  border-radius: 25px;
  height: 20vh;
  width: 100vw;
  display: flex;
  justify-content: center;
  align-items: center;
}

 .circle {
  display: flex;
  margin: 1rem;
  border-radius: 50%;
  height: 50px;
  width: 50px;
  background: rgba(0,0,0,0.3);
  position: relative;
  transition: 1s all ease;
}

.circle:before {
  position: absolute;
  content: '';
  height: 15px;
  width: 15px;
  left: 17.5px;
  top: -15px;
  margin: 0;
  padding: 0;
  display: block;
  background: rgb(68, 53, 73);
  border-radius: 2px;
  display:inline-block;
  border-bottom: 2px solid rgb(97, 81, 107);
}

.circle:after{
  position: absolute;
  content: "";
  top: -20px;
  left: 30px;
  position: absolute;
  width: 70px;
  height: 18.6666666667px;
  border-bottom: solid #222 2px;
  border-radius: 50%;
}

.circle:last-child::after{
  content: '';
  position: absolute;
  border: none;
}

.red {
	background-color: #c0392b;
  animation: glow-1 2s infinite;
}


.yellow {
	background-color: #f1c40f;
  animation: glow-2 2s infinite;
}

.blue {
	background-color: #64fcfe;
 animation: glow-3  2s infinite;
}

.green {
	background-color: #2ecc71;
  animation: glow-4 2s infinite;
}

@keyframes glow-1 {
  0%, 100% {
	box-shadow: 0 0 20px 5px #c0392b;
  }

  50% {
    box-shadow: none;
  }
}

@keyframes glow-2 {
  0%, 100% {
    box-shadow: none;
  }

  50% {
    box-shadow: 0 0 20px 5px #f1c40f;
  }
}

@keyframes glow-3 {
  0%, 100% {
    box-shadow: 0 0 20px 5px #74f7e1;
  }

  50% {
    box-shadow: none;
  }
}

@keyframes glow-4 {
  0%, 100% {
	box-shadow: none;
  }

  50% {
    box-shadow: 0 0 20px 5px #2ecc71;
  }
}

  <!DOCTYPE html>
  <html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>RayaLights</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <div class="main">
      <div  class="circle red"></div>
      <div  class="circle yellow"></div>
      <div  class="circle blue"></div>
      <div  class="circle green"></div>
      <div  class="circle red"></div>
      <div  class="circle yellow"></div>
      <div  class="circle blue"></div>
      <div  class="circle green"></div>
    </div>
    <div class="utilities">
      <button id="btn">Stop</button>
    </div>


    <script src="app.js" charset="utf-8"></script>
  </body>
  </html>

h3t1

const circle = document.getElementsByClassName('circle')
const pause = document.getElementById('pause')
const play = document.getElementById('play')
const stop = document.getElementById('stop')
var len = circle.length;

pause.addEventListener('click', function() {
  for (var i = 0; i < len; i++) {
    circle[i].style.animationPlayState = "paused";
    circle[i].style.WebkitAnimationPlayState = "paused";
  }
})
play.addEventListener('click', function() {
  for (var i = 0; i < len; i++) {
    circle[i].removeAttribute("style");
    circle[i].style.animationPlayState = "running";
    circle[i].style.WebkitAnimationPlayState = "running";
  }
})
stop.addEventListener('click', function() {
  for (var i = 0; i < len; i++) {
    circle[i].style.animation = "none";
  }
})

* {
  box-sizing: border-box;
}

body {
  background: rgb(25, 21, 26);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
  overflow: hidden;
}

.utilities {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.utilities button {
  height: 50px;
  width: 100px;
  background: none;
  color: white;
  outline: none;
  border: 2px solid rgb(184, 134, 222);
  border-radius: 25px;
  margin: 0 12px;
}

button:hover {
  background: rgb(184, 134, 222);
  cursor: pointer;
  transition: 0.5s ease;
}

.main {
  background: rgb(57, 53, 75);
  border-radius: 25px;
  height: 20vh;
  width: 100vw;
  display: flex;
  justify-content: center;
  align-items: center;
}

.circle {
  display: flex;
  margin: 1rem;
  border-radius: 50%;
  height: 50px;
  width: 50px;
  background: rgba(0, 0, 0, 0.3);
  position: relative;
  transition: 1s all ease;
}

.circle:before {
  position: absolute;
  content: '';
  height: 15px;
  width: 15px;
  left: 17.5px;
  top: -15px;
  margin: 0;
  padding: 0;
  display: block;
  background: rgb(68, 53, 73);
  border-radius: 2px;
  display: inline-block;
  border-bottom: 2px solid rgb(97, 81, 107);
}

.circle:after {
  position: absolute;
  content: "";
  top: -20px;
  left: 30px;
  position: absolute;
  width: 70px;
  height: 18.6666666667px;
  border-bottom: solid #222 2px;
  border-radius: 50%;
}

.circle:last-child::after {
  content: '';
  position: absolute;
  border: none;
}

.red {
  background-color: #c0392b;
  animation: glow-1 2s infinite;
}

.yellow {
  background-color: #f1c40f;
  animation: glow-2 2s infinite;
}

.blue {
  background-color: #64fcfe;
  animation: glow-3 2s infinite;
}

.green {
  background-color: #2ecc71;
  animation: glow-4 2s infinite;
}

@keyframes glow-1 {
  0%,
  100% {
    box-shadow: 0 0 20px 5px #c0392b;
  }
  50% {
    box-shadow: none;
  }
}

@keyframes glow-2 {
  0%,
  100% {
    box-shadow: none;
  }
  50% {
    box-shadow: 0 0 20px 5px #f1c40f;
  }
}

@keyframes glow-3 {
  0%,
  100% {
    box-shadow: 0 0 20px 5px #74f7e1;
  }
  50% {
    box-shadow: none;
  }
}

@keyframes glow-4 {
  0%,
  100% {
    box-shadow: none;
  }
  50% {
    box-shadow: 0 0 20px 5px #2ecc71;
  }
}

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>RayaLights</title>
  <link rel="stylesheet" href="style.css">
</head>

<body>
  <div class="main">
    <div class="circle red"></div>
    <div class="circle yellow"></div>
    <div class="circle blue"></div>
    <div class="circle green"></div>
    <div class="circle red"></div>
    <div class="circle yellow"></div>
    <div class="circle blue"></div>
    <div class="circle green"></div>
  </div>
  <div class="utilities">
    <button id="pause">Pause</button>
    <button id="play">Play</button>
    <button id="stop">Stop</button>
  </div>

</body>

</html>

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