js中 clientWidth offsetWidth scrollWidth等区别

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        body,html{
            margin:0px;
            padding:0px;
        }
        #div{
            height: 300px;width:200px;background:indianred;
            padding: 20px;
            border:20px solid #777 ;
            margin: 100px;
        }
    </style>
</head>
<body style="">
    <div style="height: 40px;background: antiquewhite"></div>
    <div id="div2" onscroll="myFunction()" style="width: 300px;overflow: scroll;position: absolute;height: 200px;background: rebeccapurple">
        <div id="div"></div>
    </div>


</body>
</html>
    <script src="./event.js"></script>
<script>
        var dom = document.getElementById('div');
        var dom2 = document.getElementById('div2');
        console.log(window.getComputedStyle(dom).width) //200px; content
        console.log(dom.offsetWidth); //280 content + padding + bordder
        console.log(dom.clientWidth) ;//240  content + padding
        console.log(dom.scrollWidth) ;//240 content + padding +(溢出尺寸)
        //当前元素 上边框 外边缘 到 最近的已定位父级(offsetParent) 上边框 内边缘的 距离。如果父
        //级都没有定位,则分别是到body 顶部 和左边的距离
        console.log(dom.offsetTop); //100 content + padding + bordder
        console.log(dom.clientTop) ;//20  border-top
        function myFunction(){
            //元素滚动条内的顶部隐藏部分的高度
            console.log(dom2.scrollTop); //0

        }

</script>

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转载自www.cnblogs.com/mengdiezhuangzhou/p/9761140.html