1 max-width
<!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>图片自适应-1</title>
<style>
.img {
max-width: 200px;
}
img {
display: inline-block;
max-width: 100%;
height: auto;
}
</style>
</head>
<body>
<div class="img">
<img src="./cat.jpg" alt="" srcset="">
</div>
</body>
</html>
<!DOCTYPE html>
<html lang
