页面首次加载时和鼠标悬停/移出时动态改变矩形高度。
HTML:
CSS:
.rect {
height: 100px;
width: 200px;
background-color: blue;
transition: height 0.3s ease;
}
.rect:hover {
height: 150px;
}
JS:
window.onload = function() {
var rect = document.querySelector('.rect');
rect.style.height = '150px';
setTimeout(function() {
rect.style.height = '100px';
}, 1000); // 1秒后恢复初始高度
}
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