纯css的吸顶效果实现——使用“position:sticky”
文章目录一.sticky用法1.1 示例11.2 示例2二.sticky使用过程中的坑2.1 只在 Containing Block 内有效2.2 Overflow对Sticky的影响2.3.兼容问题三.应用场景3.1 表格的查看3.2 导航栏、栏目条等吸顶效果四、参考资料一.sticky用法使用 CSS Sticky 需要两个条件。position: sticky;top: 0;/*top/ri
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文章目录
一.sticky用法
使用 CSS Sticky 需要两个条件。
position: sticky;
top: 0; /*top/right/bottom/left 任一有效值*/
top：0 意思是当元素滑动到距离视口 0px 时再继续滑动，元素吸顶。
1.1 示例1
在这里，将图中绿色部分的div中的position定义为sticky，同时指定了top为0（即吸顶的时候距离顶部距离为0），并通过z-index确定覆盖顺序，保证定位02覆盖在01之上。完整代码如下。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>sticky吸顶</title>
<style>
div.sticky {
position: -webkit-sticky;
position: sticky;
top: 0;
padding: 5px;
background-color: #cae8ca;
border: 2px solid #4CAF50;
}
</style>
</head>
<body>
<p>尝试滚动页面。</p>
<div>
<div class="sticky" style="z-index: 1">我是粘性定位!</div>
<div>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
</div>
<div class="sticky" style="z-index: 2">我是粘性定位02!</div>
<div >
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
<p>滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动滚动</p>
</div>
</div>
</body>
</html>
1.2 示例2
这里实现的主要是表格中表头的固定，完整代码如下。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body {
margin: 0;
padding: 2rem;
}
.table-container{
width: 100%;
}
table {
text-align: center;
width: 100%;
}
tr.red th {
background: #ff4b4b;
}
tr.green th {
background: #0db50d;
}
tr td {
padding: 8px 4px;
}
/*表头实现固定*/
tr th {
position: sticky;
top: 0;
padding: 10px 4px;
color: #fff;
}
</style>
</head>
<body>
<div class="table-container">
<table>
<thead>
<tr class="red">
<th>Name</th>
<th>Age</th>
<th>Job</th>
<th>Color</th>
<th>URL</th>
</tr>
</thead>
<tbody>
<tr>
<td>Lorem.</td>
<td>Ullam.</td>
<td>Vel.</td>
<td>At.</td>
<td>Quis.</td>
</tr>
<tr>
<td>Quas!</td>
<td>Velit.</td>
<td>Quisquam?</td>
<td>Rerum?</td>
<td>Iusto?</td>
</tr>
<tr>
<td>Voluptates!</td>
<td>Fugiat?</td>
<td>Alias.</td>
<td>Doloribus.</td>
<td>Veritatis.</td>
</tr>
<tr>
<td>Maiores.</td>
<td>Ab.</td>
<td>Accusantium.</td>
<td>Ullam!</td>
<td>Eveniet.</td>
</tr>
<tr>
<td>Hic.</td>
<td>Id!</td>
<td>Officiis.</td>
<td>Modi!</td>
<td>Obcaecati.</td>
</tr>
<tr>
<td>Soluta.</td>
<td>Ad!</td>
<td>Impedit.</td>
<td>Alias!</td>
<td>Ad.</td>
</tr>
<tr>
<td>Expedita.</td>
<td>Quo.</td>
<td>Exercitationem!</td>
<td>Optio?</td>
<td>Ipsum?</td>
</tr>
<tr>
<td>Commodi!</td>
<td>Rem.</td>
<td>Aspernatur.</td>
<td>Accusantium!</td>
<td>Maiores.</td>
</tr>
<tr>
<td>Omnis.</td>
<td>Cumque?</td>
<td>Eveniet!</td>
<td>Mollitia?</td>
<td>Vero.</td>
</tr>
<tr>
<td>Error!</td>
<td>Inventore.</td>
<td>Quasi!</td>
<td>Ducimus.</td>
<td>Repudiandae!</td>
</tr>
<tr>
<td>Dolores!</td>
<td>Necessitatibus.</td>
<td>Corrupti!</td>
<td>Eum.</td>
<td>Sunt!</td>
</tr>
<tr>
<td>Ea.</td>
<td>Culpa?</td>
<td>Quam?</td>
<td>Nemo!</td>
<td>Sit!</td>
</tr>
<tr>
<td>Veritatis!</td>
<td>Facilis.</td>
<td>Expedita?</td>
<td>Ipsam!</td>
<td>Omnis!</td>
</tr>
<tr>
<td>Vitae.</td>
<td>Cumque.</td>
<td>Repudiandae.</td>
<td>Ut?</td>
<td>Sed!</td>
</tr>
<tr>
<td>Accusantium.</td>
<td>Adipisci.</td>
<td>Sit.</td>
<td>Maxime.</td>
<td>Harum.</td>
</tr>
<tr class="green">
<th>Name</th>
<th>Age</th>
<th>Job</th>
<th>Color</th>
<th>URL</th>
</tr>
<tr>
<td>Qui!</td>
<td>Accusamus?</td>
<td>Minima?</td>
<td>Dolorum.</td>
<td>Molestiae.</td>
</tr>
<tr>
<td>Vero!</td>
<td>Voluptatum?</td>
<td>Ea?</td>
<td>Odit!</td>
<td>A.</td>
</tr>
<tr>
<td>Debitis.</td>
<td>Veniam.</td>
<td>Fuga.</td>
<td>Alias!</td>
<td>Recusandae!</td>
</tr>
<tr>
<td>Aperiam!</td>
<td>Dolorum.</td>
<td>Enim.</td>
<td>Sapiente!</td>
<td>Suscipit?</td>
</tr>
<tr>
<td>Consequuntur.</td>
<td>Doloremque.</td>
<td>Illum!</td>
<td>Iste!</td>
<td>Sint!</td>
</tr>
<tr>
<td>Facilis.</td>
<td>Error.</td>
<td>Fugiat.</td>
<td>At.</td>
<td>Modi?</td>
</tr>
<tr>
<td>Voluptatibus!</td>
<td>Alias.</td>
<td>Eaque.</td>
<td>Cum.</td>
<td>Ducimus!</td>
</tr>
<tr>
<td>Nihil.</td>
<td>Enim.</td>
<td>Earum?</td>
<td>Nobis?</td>
<td>Eveniet.</td>
</tr>
<tr>
<td>Eum!</td>
<td>Id?</td>
<td>Molestiae.</td>
<td>Velit.</td>
<td>Minima.</td>
</tr>
<tr>
<td>Sapiente?</td>
<td>Neque.</td>
<td>Obcaecati!</td>
<td>Earum.</td>
<td>Esse.</td>
</tr>
<tr>
<td>Nam?</td>
<td>Ipsam!</td>
<td>Provident.</td>
<td>Ullam.</td>
<td>Quae?</td>
</tr>
<tr>
<td>Amet!</td>
<td>In.</td>
<td>Officia!</td>
<td>Natus?</td>
<td>Tempore?</td>
</tr>
<tr>
<td>Consequatur.</td>
<td>Hic.</td>
<td>Officia.</td>
<td>Itaque?</td>
<td>Quasi.</td>
</tr>
<tr>
<td>Enim.</td>
<td>Tenetur.</td>
<td>Asperiores?</td>
<td>Eos!</td>
<td>Libero.</td>
</tr>
<tr>
<td>Exercitationem.</td>
<td>Quidem!</td>
<td>Beatae?</td>
<td>Adipisci?</td>
<td>Accusamus.</td>
</tr>
<tr>
<td>Omnis.</td>
<td>Accusamus?</td>
<td>Eius!</td>
<td>Recusandae!</td>
<td>Dolor.</td>
</tr>
<tr>
<td>Magni.</td>
<td>Temporibus!</td>
<td>Odio!</td>
<td>Odit!</td>
<td>Voluptatum?</td>
</tr>
<tr>
<td>Eum.</td>
<td>Animi!</td>
<td>Labore.</td>
<td>Alias!</td>
<td>Fuga.</td>
</tr>
<tr>
<td>Quia!</td>
<td>Quis.</td>
<td>Neque?</td>
<td>Illo.</td>
<td>Ad.</td>
</tr>
<tr>
<td>Officiis.</td>
<td>Exercitationem!</td>
<td>Adipisci?</td>
<td>Officiis?</td>
<td>In?</td>
</tr>
<tr>
<td>Voluptates?</td>
<td>Voluptatum.</td>
<td>Nihil.</td>
<td>Totam?</td>
<td>Quisquam!</td>
</tr>
<tr>
<td>Soluta.</td>
<td>Tempore!</td>
<td>Cupiditate.</td>
<td>Beatae.</td>
<td>Perspiciatis.</td>
</tr>
<tr>
<td>Porro.</td>
<td>Officia?</td>
<td>Error.</td>
<td>Culpa?</td>
<td>Fugit.</td>
</tr>
<tr>
<td>Et?</td>
<td>Nemo.</td>
<td>Nisi?</td>
<td>Totam!</td>
<td>Voluptate.</td>
</tr>
<tr>
<td>Saepe?</td>
<td>Vero.</td>
<td>Amet?</td>
<td>Illo!</td>
<td>Laborum!</td>
</tr>
<tr class="purple">
<th>Name</th>
<th>Age</th>
<th>Job</th>
<th>Color</th>
<th>URL</th>
</tr>
<tr>
<td>Atque!</td>
<td>Tenetur.</td>
<td>Optio.</td>
<td>Iure.</td>
<td>Porro.</td>
</tr>
<tr>
<td>Atque.</td>
<td>Alias.</td>
<td>Doloremque.</td>
<td>Velit.</td>
<td>Culpa.</td>
</tr>
<tr>
<td>Placeat?</td>
<td>Necessitatibus.</td>
<td>Voluptate!</td>
<td>Possimus.</td>
<td>Nam?</td>
</tr>
<tr>
<td>Illum!</td>
<td>Quae.</td>
<td>Expedita!</td>
<td>Omnis.</td>
<td>Nam.</td>
</tr>
<tr>
<td>Consequuntur!</td>
<td>Consectetur!</td>
<td>Provident!</td>
<td>Consequuntur!</td>
<td>Distinctio.</td>
</tr>
<tr>
<td>Aperiam!</td>
<td>Voluptatem.</td>
<td>Cupiditate!</td>
<td>Quae.</td>
<td>Praesentium.</td>
</tr>
<tr>
<td>Possimus?</td>
<td>Qui.</td>
<td>Consequuntur.</td>
<td>Deleniti.</td>
<td>Voluptas.</td>
</tr>
<tr>
<td>Hic?</td>
<td>Ab.</td>
<td>Asperiores?</td>
<td>Omnis.</td>
<td>Animi!</td>
</tr>
<tr>
<td>Cupiditate.</td>
<td>Velit.</td>
<td>Libero.</td>
<td>Iste.</td>
<td>Dicta?</td>
</tr>
<tr>
<td>Consequatur!</td>
<td>Nobis.</td>
<td>Aperiam!</td>
<td>Odio.</td>
<td>Nemo!</td>
</tr>
<tr>
<td>Dolorem.</td>
<td>Distinctio?</td>
<td>Provident?</td>
<td>Nisi!</td>
<td>Impedit?</td>
</tr>
<tr>
<td>Accusantium?</td>
<td>Ea.</td>
<td>Doloribus.</td>
<td>Nobis.</td>
<td>Maxime?</td>
</tr>
<tr>
<td>Molestiae.</td>
<td>Rem?</td>
<td>Enim!</td>
<td>Maxime?</td>
<td>Reiciendis!</td>
</tr>
<tr>
<td>Commodi.</td>
<td>At.</td>
<td>Earum?</td>
<td>Fugit.</td>
<td>Maxime?</td>
</tr>
<tr>
<td>Eligendi?</td>
<td>Quis.</td>
<td>Error?</td>
<td>Atque.</td>
<td>Perferendis.</td>
</tr>
<tr>
<td>Quidem.</td>
<td>Odit!</td>
<td>Tempore.</td>
<td>Voluptates.</td>
<td>Facere!</td>
</tr>
<tr>
<td>Repudiandae!</td>
<td>Accusamus?</td>
<td>Soluta.</td>
<td>Incidunt.</td>
<td>Aliquid?</td>
</tr>
<tr>
<td>Quisquam?</td>
<td>Eius.</td>
<td>Obcaecati?</td>
<td>Maxime.</td>
<td>Nihil.</td>
</tr>
<tr>
<td>Minus.</td>
<td>Magni?</td>
<td>Necessitatibus?</td>
<td>Asperiores.</td>
<td>Iure.</td>
</tr>
<tr>
<td>Ipsa!</td>
<td>Temporibus.</td>
<td>Non!</td>
<td>Dolore.</td>
<td>Veritatis.</td>
</tr>
<tr>
<td>Ea!</td>
<td>Officia?</td>
<td>Doloribus?</td>
<td>Deleniti?</td>
<td>Dolorem!</td>
</tr>
<tr>
<td>Sequi?</td>
<td>Molestias!</td>
<td>Nesciunt.</td>
<td>Qui.</td>
<td>Doloribus?</td>
</tr>
<tr>
<td>Id.</td>
<td>Enim?</td>
<td>Quam!</td>
<td>Sunt!</td>
<td>Consequuntur.</td>
</tr>
<tr>
<td>Reprehenderit?</td>
<td>Ut?</td>
<td>Veritatis!</td>
<td>Corporis!</td>
<td>Ipsa.</td>
</tr>
<tr>
<td>Blanditiis!</td>
<td>Veniam!</td>
<td>Tenetur.</td>
<td>Eos?</td>
<td>Repellat!</td>
</tr>
<tr>
<td>Enim?</td>
<td>Atque!</td>
<td>Aspernatur?</td>
<td>Fugit.</td>
<td>Voluptatibus!</td>
</tr>
<tr>
<td>Nihil.</td>
<td>Distinctio!</td>
<td>Aut!</td>
<td>Rerum!</td>
<td>Dolorem?</td>
</tr>
<tr>
<td>Inventore!</td>
<td>Hic.</td>
<td>Explicabo.</td>
<td>Sit.</td>
<td>A.</td>
</tr>
<tr>
<td>Inventore.</td>
<td>A.</td>
<td>Nam.</td>
<td>Beatae.</td>
<td>Consequatur.</td>
</tr>
<tr>
<td>Eligendi.</td>
<td>Illum.</td>
<td>Enim?</td>
<td>Dignissimos!</td>
<td>Ducimus?</td>
</tr>
<tr>
<td>Eligendi!</td>
<td>Fugiat?</td>
<td>Deleniti!</td>
<td>Rerum?</td>
<td>Delectus?</td>
</tr>
<tr>
<td>Sit.</td>
<td>Nam.</td>
<td>Eveniet?</td>
<td>Veritatis.</td>
<td>Adipisci!</td>
</tr>
<tr>
<td>Nostrum?</td>
<td>Totam?</td>
<td>Voluptates!</td>
<td>Ab!</td>
<td>Consequatur.</td>
</tr>
<tr>
<td>Error!</td>
<td>Dicta?</td>
<td>Voluptatum?</td>
<td>Corporis!</td>
<td>Ea.</td>
</tr>
<tr>
<td>Vel.</td>
<td>Asperiores.</td>
<td>Facere.</td>
<td>Quae.</td>
<td>Fugiat.</td>
</tr>
<tr>
<td>Libero?</td>
<td>Molestias.</td>
<td>Praesentium!</td>
<td>Accusantium!</td>
<td>Tenetur.</td>
</tr>
<tr>
<td>Eveniet.</td>
<td>Quam.</td>
<td>Quibusdam.</td>
<td>Eaque?</td>
<td>Dolore!</td>
</tr>
<tr>
<td>Asperiores.</td>
<td>Impedit.</td>
<td>Ullam?</td>
<td>Quod.</td>
<td>Placeat.</td>
</tr>
<tr>
<td>In?</td>
<td>Aliquid.</td>
<td>Voluptatum!</td>
<td>Omnis?</td>
<td>Magni.</td>
</tr>
<tr>
<td>Autem.</td>
<td>Earum!</td>
<td>Debitis!</td>
<td>Eius.</td>
<td>Incidunt.</td>
</tr>
<tr>
<td>Blanditiis?</td>
<td>Impedit.</td>
<td>Libero?</td>
<td>Reiciendis!</td>
<td>Tempore.</td>
</tr>
<tr>
<td>Quasi.</td>
<td>Reiciendis.</td>
<td>Aut?</td>
<td>Architecto?</td>
<td>Vero!</td>
</tr>
<tr>
<td>Fuga!</td>
<td>Illum!</td>
<td>Tenetur!</td>
<td>Vitae.</td>
<td>Natus.</td>
</tr>
<tr>
<td>Dolorem?</td>
<td>Eaque!</td>
<td>Vero?</td>
<td>Quibusdam.</td>
<td>Deleniti?</td>
</tr>
<tr>
<td>Minus.</td>
<td>Accusantium?</td>
<td>Ab.</td>
<td>Cupiditate.</td>
<td>Atque?</td>
</tr>
<tr>
<td>Hic.</td>
<td>Eligendi.</td>
<td>Sit?</td>
<td>Nihil.</td>
<td>Dolor.</td>
</tr>
<tr>
<td>Quidem.</td>
<td>In?</td>
<td>Nesciunt?</td>
<td>Adipisci.</td>
<td>Neque.</td>
</tr>
<tr>
<td>Eos.</td>
<td>Incidunt!</td>
<td>Quis?</td>
<td>Quod?</td>
<td>Vitae!</td>
</tr>
<tr>
<td>Ullam!</td>
<td>Facilis.</td>
<td>Tempora!</td>
<td>Accusantium.</td>
<td>Consequuntur?</td>
</tr>
<tr>
<td>Numquam?</td>
<td>At.</td>
<td>Incidunt.</td>
<td>Tenetur?</td>
<td>Voluptatem.</td>
</tr>
<tr>
<td>Iusto?</td>
<td>Inventore.</td>
<td>Molestias.</td>
<td>Accusantium.</td>
<td>Sunt.</td>
</tr>
<tr>
<td>Repellendus!</td>
<td>Ex.</td>
<td>Magnam.</td>
<td>Odit!</td>
<td>Iste?</td>
</tr>
<tr>
<td>Id!</td>
<td>Reiciendis?</td>
<td>Rem.</td>
<td>Quae!</td>
<td>Laborum?</td>
</tr>
<tr>
<td>Exercitationem?</td>
<td>Maiores.</td>
<td>Minima.</td>
<td>Nemo!</td>
<td>Sequi.</td>
</tr>
<tr>
<td>Qui.</td>
<td>Impedit?</td>
<td>Reprehenderit.</td>
<td>Distinctio.</td>
<td>Natus?</td>
</tr>
<tr>
<td>Suscipit!</td>
<td>Tenetur.</td>
<td>Cumque!</td>
<td>Molestiae.</td>
<td>Fugiat?</td>
</tr>
<tr>
<td>Sunt?</td>
<td>Quis?</td>
<td>Officia.</td>
<td>Incidunt.</td>
<td>Voluptate.</td>
</tr>
<tr>
<td>Possimus.</td>
<td>Mollitia!</td>
<td>Eveniet!</td>
<td>Temporibus.</td>
<td>Mollitia!</td>
</tr>
<tr>
<td>Incidunt.</td>
<td>Fugiat.</td>
<td>Error.</td>
<td>Odit.</td>
<td>Cumque?</td>
</tr>
<tr>
<td>Maxime?</td>
<td>Qui!</td>
<td>Sapiente!</td>
<td>Natus.</td>
<td>Soluta?</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
二.sticky使用过程中的坑
2.1 只在 Containing Block 内有效
用一个 div 把 div.sticky 包裹起来，发现 Sticky 效果失效了！！！
根据文档，Sticky 效果只在Containing Block内有效，Containing Block 滑出屏幕时，Stickey Element 也跟着滑走。
修改外层div的高度，sticky效果又回来了。
2.2 Overflow对Sticky的影响
overflow属性参考资料：菜鸟教程
给包裹了sticky部分的div加上 overflow: auto属性，发现sticky失效（overflow 设置为其他非 visible 的有效值也是同样效果）
根据参考资料③中博主的表述，其得出的结论如下：
Sticky Element 的 offset 值是依据 nearest scrolling ancestor (距离最近的滚动祖先) 计算的，如果没有匹配上的祖先元素，则使用视口作为参照物。
问题就出在 overflow-x 或者 overflow-y 其中任一为非 visible 则认为是要找的目标元素，而在滚动窗口的过程中，Sticky Element 和 它找到的目标祖先元素的 offset 值一直没有改变，所以 Sticky 不起作用。
对症下药，让滚动发生在被“误匹配”上的祖先元素内即可恢复 Sticky Effect。
/**原来的代码**/
#root {
overflow: auto;
}
/**改进后的代码**/
#root {
overflow: auto;
height: 100vh;
}
我本人认为，当使用sticky这一position定位时，应该必须注意好是否有必要设置overflow这一属性，最好的使用方法还是将需要sticky的部分把控在一个特定的div内，尽可能避免复杂情况的发生。
例如如下代码中，sticky部分只会在特定的div内起作用，而不会影响到下一个div，而且这样逻辑清晰，不易出错，方便维护。
2.3.兼容问题
sticky这一属性值在2017年才推出，IE, Edge 15 及更早 IE 版本不支持 sticky 定位。 Safari 需要使用 -webkit- prefix。而使用移动端基本不会有问题。
三.应用场景
3.1 表格的查看
在网页中查看表格首行和首列固定不动，这是一种很常见的应用场景。
主要代码思路如下
.table-container {
width: 100%;
height: 100%;
overflow: auto;
}
/* 首列固定 */
.table-container thead tr > th:first-child,
.table-container tbody tr > td:first-child {
position: sticky;
left: 0;
z-index: 1;
}
/* 表头固定 */
.table-container thead tr > th {
position: sticky;
top: 0;
z-index: 2;
}
/* 表头首列强制最顶层 */
.table-container thead tr > th:first-child {
z-index: 3;
}
3.2 导航栏、栏目条等吸顶效果
四、参考资料
①菜鸟教程 https://www.runoob.com/css/css-positioning.html
②sticky其实很简单 http://www.mamicode.com/info-detail-2775061.html
③CSS 定位详解 阮一峰 http://www.ruanyifeng.com/blog/2019/11/css-position.html
④纯CSS实现Table固定表头和首列 https://www.tangshuang.net/7739.html
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