我使用引导程序3创建了4列。每列都是400x220px。当视口命中300x350px时，我会做任何使列< 768px变大的事情。我不知道执行此操作的方法，而且我可以看到Bootstrap无法执行此操作。
我可以使用html5 <picture>标签。但是我看不到可以将其与Bootstrap 3网格集成，在我看来这不是一个好的解决方案。
有人对我该怎么做有另一个想法，还是不可能？
A demo of the columns is here。
background-color: #f5f5f5;
}
/* Set width between grid elements */
.small-padding.top {
padding-top:10px;
}
.small-padding.bottom {
padding-bottom:10px;
}
.small-padding.left {
padding-left:5px;
}
.small-padding.right {
padding-right:5px;
}
.margin_bottom {
margin-bottom: 10px;
}
.row [class*="col-"] {
padding-right: 5px;
padding-left: 5px;
}
.row {
margin-left: -5px;
margin-right: -5px;
}
.img-responsive {
height: 100%;
}
/* Position of buttons/text in a single grid element */
.inner-wrapper {
text-align: center;
background: none;
}
.centered {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.bottom-right {
position: absolute;
bottom: 8px;
right: 16px;
}
.bottom-left {
position: absolute;
bottom: 8px;
left: 16px;
}
/* Color on text */
.dark-font {
color: #333;
}
.light-font {
color: #fff;
}
/* Set full width on columns */
@media (max-width: 768px) {
.img-responsive {
width: 100%;
}
.btn-success {
width: fit-content;
}
}
@media (max-width: 991px) {
h3 {
font-size: 1.2em;
}
}<!DOCTYPE html>
<html lang="en">
<head>
<title>TEMPLATE</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-xs-6 col-sm-3 margin_bottom">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-left">
<h3>Here is headline 1</h3>
</div>
</div>
<div class="col-xs-6 col-sm-3 margin_bottom">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-left">
<h3>Here is headline 2</h3>
</div>
</div>
<div class="col-xs-6 col-sm-3 margin_bottom">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-right">
<h3>Here is headline 3</h3>
</div>
</div>
<div class="col-xs-6 col-sm-3 margin_bottom">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-right">
<h3>Here is headline 4</h3>
</div>
</div>
</div>
</div>
</body>
</html>
答案 0 :(得分：1)
在您的容器中添加一个类，使其具有高度...我想这就是您要的。如果没有，让我知道！
background-color: #f5f5f5;
}
/* Set width between grid elements */
.small-padding.top {
padding-top:10px;
}
.small-padding.bottom {
padding-bottom:10px;
}
.small-padding.left {
padding-left:5px;
}
.small-padding.right {
padding-right:5px;
}
.margin_bottom {
margin-bottom: 10px;
}
.row [class*="col-"] {
padding-right: 5px;
padding-left: 5px;
}
.row {
margin-left: -5px;
margin-right: -5px;
}
.img-responsive {
height: 100%;
}
/* Position of buttons/text in a single grid element */
.inner-wrapper {
text-align: center;
background: none;
}
.centered {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.bottom-right {
position: absolute;
bottom: 8px;
right: 16px;
}
.bottom-left {
position: absolute;
bottom: 8px;
left: 16px;
}
/* Color on text */
.dark-font {
color: #333;
}
.light-font {
color: #fff;
}
/* Set full width on columns */
@media (max-width: 768px) {
.img-responsive { /*EDIT*/
width: 100%;
height: auto;
}
.btn-success {
width: fit-content;
}
/* Here you go */
.height-m {
height: 350px;
}
}
@media (max-width: 991px) {
h3 {
font-size: 1.2em;
}
}<!DOCTYPE html>
<html lang="en">
<head>
<title>TEMPLATE</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-xs-6 col-sm-3 margin_bottom height-m">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-left">
<h3>Here is headline 1</h3>
</div>
</div>
<div class="col-xs-6 col-sm-3 margin_bottom height-m">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-left">
<h3>Here is headline 2</h3>
</div>
</div>
<div class="col-xs-6 col-sm-3 margin_bottom height-m">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-right">
<h3>Here is headline 3</h3>
</div>
</div>
<div class="col-xs-6 col-sm-3 margin_bottom height-m">
<img src="http://placehold.it/400x220" alt="5" class="img-responsive" />
<div class="inner-wrapper bottom-right">
<h3>Here is headline 4</h3>
</div>
</div>
</div>
</div>
</body>
</html>