<!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>
        *{
            margin: 0;
            padding: 0;
        }
        div{
            width: 100px;
            height: 100px;
            padding: 50px;
            border: 50px solid #000;
            background: red;
            background-clip: content-box;
        }
    </style>
</head>
<body>
    <div id="box"></div>
<script type="text/javascript">
      /*
    1.offsetWidth = 宽度 + 内边距 + 边框
     offsetHeight = 高度 + 内边距 + 边框
    2.clientWidth = 宽度 + 内边距
     clientHeight = 高度 + 内边距
    */
    let oDiv = document.querySelector("div");
    console.log(oDiv.clientWidth);
    console.log(oDiv.clientHeight);
    /*
    1.offsetLeft/offsetTop: 距离第一个定位祖先元素偏移位 || body
    2.clientLeft/clientTop: 左边框 和 顶部边框
    */
   console.log(oDiv.clientLeft);
   console.log(oDiv.clientTop);
</script>
</body>
</html>