通過JavaScript調用CSS動畫
-
- 案例一：通過按鈕開始和停止動畫
- 案例二：通過定時器停止動畫
案例一：通過按鈕開始和停止動畫
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
.animation {
animation: move 2s infinite alternate;
border:1px solid;
width:100px;
height:100px;
margin-top:50px;
}
@keyframes move {
0% {
transform: rotate(0deg) translate(-100px, 0); ;
}
100% {
transform: rotate(360deg) translate(100px, 0);
}
}
.btn:hover{
cursor: pointer;
}
</style>
</head>
<body>
<div class="btn">stop</div>
<div class="animation"></div>
<script type="text/javascript">
document.querySelector('.btn').addEventListener('click', function() {
//querySelector() 方法傳回文檔中比對指定 CSS 選擇器的第一個元素
let btn = document.querySelector('.btn');
let elem = document.querySelector('.animation');
let state = elem.style['animationPlayState'];
if(state === 'paused') {
elem.style['animationPlayState'] = 'running';
btn.innerText = 'stop';
} else {
elem.style['animationPlayState'] = 'paused';
btn.innerText = 'play';
}
});
</script>
</body>
</html>
案例二：通過定時器停止動畫
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
.animation {
animation: move 2s linear infinite alternate;
border:1px solid;
width:100px;
height:100px;
}
@keyframes move {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="animation"></div>
<script type="text/javascript">
// 設定動畫在600毫秒後暫停，這個時間值可以根據情況（要停止的位置）自己設定
setInterval("pausedMove()",600);
function pausedMove(){
let elem = document.querySelector('.animation');
//這樣寫也可以：elem.style.animationPlayState = 'paused';
elem.style['animationPlayState'] = 'paused';
}
</script>
</body>
</html>
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