示例
<style>
* {
padding: 0;
margin: 0;
}
body {
background-color: #f1f1f1;
}
#container {
width: 300px;
height: 200px;
padding: 20px;
margin: 30px;
border: 5px solid #ccc;
box-sizing: border-box;
overflow: auto;
background-color: #fff;
}
#content {
width: 600px;
height: 500px;
display: inline-block;
background-color: #f1f1f1;
}
</style>
<body>
<p>offsetHeight</p>
<div id="container">
<!--<div id="content">
<p>offHeight scrollHeight clientHeight 区别</p>
</div>-->
</div>
</body>
<script>
const container = document.getElementById('container')
console.log('offsetWidth', container.offsetWidth)
console.log('offsetHeight', container.offsetHeight)
console.log('clientWidth', container.clientWidth)
console.log('clientHeight', container.clientHeight)
console.log('scrollWidth', container.scrollWidth)
console.log('scrollHeight', container.scrollHeight)
</script>
计算规则
-
offsetHeight offsetWidth:border + padding + content
代码中如果注释content盒子,那么输出为:
1)offsetWidth = 5 * 2 + 20 * 2 + 250 = 300(content 为250是因为设置了
box-sizing: border-box
,因此offsetHeight实则为container盒子的宽度)
2)offsetHeight = 5 * 2 + 20 * 2 + 150 = 200(分析同上)
-
clientHeight clientWidth:padding + content
代码中如果注释content盒子,那么输出为:
1)clientWidth = 20 * 2 + 250 = 290(比 offsetWidth 少一个边框宽度)
2)clientHeight = 20 * 2 + 150 = 190(分析同上)
-
scrollHeight scrollWidth:padding + 实际内容尺寸
代码中如果注释content盒子,那么输出为:
1)scrollWidth = clientWidth
2)scrollHeight = clientHeight
代码中如果不注释content盒子,那么输出为:
1)scrollWidth = 20 * 2 + 600 = 640(600为 content 盒子的宽度)
2)scrollHeight = 20 * 2 + 500 = 540 (500为 content 盒子的长度)