代码示例：（标识：jsck_element_closest_1）
<!DOCTYPE html>
<html>
<style>
.container, .demo {
background-color: tomato;
color: white;
padding: 20px;
margin: 10px;
}
</style>
<body>
<h1>Element 对象</h1>
<h2>The closest() Method</h2>
<div class="demo">祖父
<div class="demo container">父
<div id="myElement" class="demo">将选择此 div 元素的父元素。</div>
</div>
</div>
<script>
const element = document.getElementById("myElement");
const closest = element.closest(".container");
if (closest) {
closest.style.border = "4px solid black";
}
</script>
</body>
</html>
