HTML CSS JavaScript 加载动画：实现可控的转圈效果
<!DOCTYPE html>
<html>
<head>
<title>Loading</title>
<style>
.loading {
border: 16px solid #f3f3f3;
border-top: 16px solid #3498db;
border-radius: 50%;
width: 120px;
height: 120px;
animation: spin 2s linear infinite;
display: none;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
</style>
</head>
<body>
<button onclick='toggleLoading()'>Toggle Loading</button>
<div class='loading' id='loading'></div>
<script>
function toggleLoading() {
var loading = document.getElementById('loading');
if (loading.style.display == 'none') {
loading.style.display = 'block';
}
else {
loading.style.display = 'none';
}
}
</script>
</body>
</html>
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