bootstrap4-图像
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>bootstrap2</title>
<link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<h3>图像</h3>
<p>创建相应式图片(将扩展到父元素)。 另外：图片以椭圆型展示：</p>
<img src="cinqueterre.jpg" alt="Cinque Terre" class="img-responsive img-circle" width="304" height="236">
</div>
<script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>
</html>