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position: sticky; top:0;
性能:
1)失常状况下, sticky 元素在页面中失常布局;
2)当 sticky 元素顶部间隔浏览器页面顶部为设定值 (此处为 0) 时, 体现得像 fixed;
3)当 sticky 元素底部与包裹它的容器底部相触时, 恢复正常;
以下示意图能够更好的感触到它的成果:
demo 代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<!-- <meta name="viewport" content="width=device-width, initial-scale=1.0"> -->
<title>Document</title>
<style>
body {margin: 0;}
.container {
position: relative;
margin: 0 auto;
width: 500px;
height: 2500px;
background-color: red;
}
.footer {
position: relative;
margin: 0 auto;
width: 500px;
height: 2500px;
background-color: rgb(76, 31, 160);
}
.header {
width: 300px;
height: 500px;
margin: 0 auto 20px;
background-color: green;
}
.content {
position: sticky;
top: 0;
height: 220px;
width: 300px;
margin: 0 auto;
background-color: rgb(90, 79, 238);
}
</style>
</head>
<body>
<body>
<div class="container">
<div class="header">header</div>
<div class="content">content</div>
</div>
<div class="footer">footer</div>
</body>
<script>
</script>
</body>
</html>
正文完