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社区首页 >问答首页 >如何使用Javascript停止和启动动画？

问如何使用Javascript停止和启动动画？
EN

Stack Overflow用户
提问于 2020-05-09 02:55:02
回答 3查看 85关注 0票数 2

我正试着用普通的Javascript来停止这个动画。我曾尝试使用classList.remove属性，但它不起作用。当我打开Chrome Dev工具时，它显示它无法读取属性remove或undefined。我不明白它想说什么。有没有一种方法可以用vanilla JS删除动画，有人可以展示解决方案吗？

​

代码语言：javascript
复制
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');
})
代码语言：javascript
复制
* {
  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;
  }
}
代码语言：javascript
复制
  <!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>

​

javascript
html
css
EN

回答 3

Stack Overflow用户

回答已采纳

发布于 2020-05-09 03:18:49

​

代码语言：javascript
复制
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";
  }
})
代码语言：javascript
复制
* {
  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;
  }
}
代码语言：javascript
复制
<!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>

​

票数 1
EN

Stack Overflow用户

发布于 2020-05-09 03:06:17

circle变量引用的是旧版本中的HTMLCollection或nodeList。不幸的是，您不能将单个操作应用于vanilla JavaScript中的所有集合。

您可以做的是将集合转换为数组，然后循环遍历它。

代码语言：javascript
复制
const circle = document.getElementsByClassName('circle')
...
const button = document.getElementById('btn')

button.addEventListener('click', function() {
 Array.from(circle).forEach((c) => {
   c.classList.remove('red');
   c.classList.remove('blue');
   c.classList.remove('yellow');
   c.classList.remove('green');
 });
});

请注意，这将完全删除颜色，使灯泡为空。

如果您只需要删除发光动画，则可以使用c.styles.animation = none;

票数 2
EN

Stack Overflow用户

发布于 2020-05-09 03:09:10

将您的addEventListener函数更改为：

代码语言：javascript
复制
button.addEventListener('click', function() {
  Array.prototype.forEach.call(circle, function(el) {
    el.style.animation = "none";
  });
})

https://jsfiddle.net/kv2qc50n/

票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/61686122

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