<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>classList</title>
<style>
.orange{
width: 250px;
height: 200px;
background-color:lawngreen;
border: 1px dotted grey;
animation-name: test;
/* 动画完成一个周期所需要的时间 */
animation-duration:2s;
/* 开始前等待的时间 */
animation-delay:1s;
/* 播放次数 */
animation-iteration-count:1;
}
@keyframes test {
0% {
width: 250px;
height: 40px;
background-color:orangered;
}
50% {
width: 250px;
height: 120px;
background-color:gold;
}
100%{
width: 250px;
height: 200px;
background-color:greenyellow;
}
}
.orangered{
animation-name: test2;
animation-duration: 3s;
animation-iteration-count: 1;
animation-delay: 0s;
}
@keyframes test2 {
0% {
height: 160px;
width: 250px;
background-color:greenyellow;
border: 1px dotted black;
}
50% {
height: 80px;
width: 250px;
background-color:gold;
border: 1px dotted black;
}
100%{
height: 0px;
width: 250px;
background-color:orangered;
border: 1px dotted black;
}
}
</style>
</head>
<body>
<button οnclick="btn()">点一下会渐变哦</button>
<br/>
<div class="orange"></div>
<script>
let orange = document.querySelector(".orange");
function btn(){
if(orange.classList.contains("orange")){
orange.classList.remove("orange")
orange.classList.add("orangered")
}else{
orange.classList.remove("orangered")
orange.classList.add("orange")
}
}
</script>
</body>
</html>
