怎么判断两个平行的dom是否包含?

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站长
· 阅读数 10
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        * {
            padding: 0;
            margin: 0;
        }
        html, body {
            height: 100vh;
        }
        .container {
            position: relative;
            height: 100vh;
        }
        .wrap {
            position: relative;
            width: 1200px;
            height: 600px;
        }
        .mark {
            position: absolute;
            width: 400px;
            height: 400px;
            background: gold;
            opacity: 0.3;
            left: 0px;
            top: 0;
        }
        .wrap-item {
            position: absolute;
        }
        .item1 {
            width: 100px;
            height: 50px;
            background-color: darkred;
            top: 10px;
            left: 20px;
        }
        .item2 {
            width: 50px;
            height: 100px;
            background-color: blue;
            top: 200px;
            left: 20px;
        }
        .item3 {
            width: 150px;
            height: 100px;
            background-color: #0ab8d3;
            top: 200px;
            left: 300px;
        }
    </style>
</head>
<body>
    
    <div class="container">
        <div class="wrap">
            <div class="wrap-item item1">
                item1
            </div>
            <div class="wrap-item item2">
                item2
            </div>
            <div class="wrap-item item3">
                item3
            </div>
        </div>
        <div class="mark"></div>
    </div>
</body>
</html>

怎么判断两个平行的dom是否包含?从上图中可以看出黄色背景mark包含了item1, item2但是不包含item3,请问应该怎么判断

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1个回答
avatar
test
2024-07-04
function isContained(element, container) {
  const containerRect = container.getBoundingClientRect();
  const elementRect = element.getBoundingClientRect();

  return (
    elementRect.top >= containerRect.top &&
    elementRect.left >= containerRect.left &&
    elementRect.bottom <= containerRect.bottom &&
    elementRect.right <= containerRect.right
  );
}

const mark = document.querySelector(".mark");
const item1 = document.querySelector(".item1");
const item2 = document.querySelector(".item2");
const item3 = document.querySelector(".item3");

console.log("Item 1 is contained:", isContained(item1, mark));
console.log("Item 2 is contained:", isContained(item2, mark));
console.log("Item 3 is contained:", isContained(item3, mark));


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