根据被嵌入内容的外部容器的宽度，自动创建一个固定的比例，从而让浏览器自动确定视频或 slideshow 的尺寸，能够在各种设备上缩放。这些规则被直接应用在 <iframe>、<embed>、<video> 和 <object> 元素上。
.embed-responsive——指定div为具有响应式特性的嵌入内容的组件；
.embed-responsive-16by9、.embed-responsive-4by3——指定组件内元素宽高比分别为16:9、4:3;
.embed-responsive-item——指定组件内的元素的最终样式与其它属性相匹配；
<!DOCTYPE html>
<html lang="zh_CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>饭盒儿——发现身边不一样的世界</title>
<link rel="stylesheet" href="css/bootstrap.min.css" type="text/css">
<script src="js/jquery-2.1.3.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="//cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="//cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
<style>
</style>
</head>
<body>
<div class="container">
<h3>
具有响应式特性的嵌入内容
</h3>
<div class="embed-responsive embed-responsive-16by9">
<iframe class="embed-responsive-item" src="http://www.shydzc.com/home"></iframe>
</div>
<hr/>
<div class="embed-responsive embed-responsive-4by3">
<embed class="embed-responsive-item" src="http://player.youku.com/player.php/sid/XMTI3NjI2MzQ2MA==/v.swf"
quality="high" width="350" height="240" align="middle" allowScriptAccess="always" allowFullScreen="true"
mode="transparent" type="application/x-shockwave-flash">
</embed>
</div>
</div>
</body>
</html>
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原文地址：http://blog.csdn.net/bboyjoe/article/details/47187473
