天天看点

offsetHeight scrollHeight clientHeight 区别

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)