css+js怎样做把圆变成直线的动画

发布网友发布时间：2022-04-21 20:09

共2个回答

懂视网时间：2022-04-22 00:31

热心网友时间：2022-04-21 21:39

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{
margin: 0 ;
padding: 0 ;
}
.circle{
margin: 30px auto;
width: 300px;
height: 300px;
border: 1px solid red;
border-radius:50% ;
transition: all linear .5s;
}
</style>
</head>
<body>
<div></div>
<button id="btn">start</button>
<script>
var circle = document.getElementsByClassName('circle')[0];
var btn = document.getElementById('btn');
var i = true;
btn.onclick = function(){
if(i == true){
circle.style.cssText = "width:300px;height:0px;border:1px solid red;border-radius:0%";
i = false;
}
else{
circle.style.cssText = "width:300px;height:300px;border:1px solid red;border-radius:50%;transition:all linear .5s;";
i = true;
}
}
</script>
</body>
</html>