首先说一下textarea的高度随文字的内容自适应，用div模拟textarea。直接看代码。其中
contenteditable="true"表示div可以编辑。。主要是设置
overflow: auto;
<!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 type="text/css">
.textarea{
width: 300px;
border:1px solid #ccc;
min-height:30px;
overflow: auto;
outline:0;
}
</style>
</head>
<body>
<div class="textarea" contenteditable="true">textarea</div>
</body>
</html>
再说下外层的div随内层的div高度自适应。直接看代码。起到作用的是在外层div的样式上加display:table
<!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 type="text/css">
.box{
width: 800px;height: 400px;
border: 1px solid #000;
position: relative;
display: table;
}
.textarea{
width: 300px;
border:1px solid #ccc;
min-height:30px;
overflow: auto;
outline:0;
}
</style>
</head>
<body>
<div class="box">
<div class="textarea" contenteditable="true">textarea</div>
</div>
</body>
</html>
时间： 2024-09-29 09:10:40