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bootstrap 预定义类clearfix和visible-xs-block

2017-04-10 10:09 393 查看
1.没使用预定义类的效果

<!doctype html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>bootstrap test</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0,minimum=1.0,maxmum=1.0,user-scalable=no">
<link rel="stylesheet" href="./css/bootstrap.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3Resize your viewport or check it out on your phone for an example.</div>
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
</div>
</div>
<script src="./js/bootstrap.min.js"></script>
</body>
</html>效果图：



2.使用预定义类

<!doctype html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>bootstrap test</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0,minimum=1.0,maxmum=1.0,user-scalable=no">
<link rel="stylesheet" href="./css/bootstrap.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3Resize your viewport or check it out on your phone for an example.</div>
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
<!-- Add the extra clearfix for only the required viewport -->
<div class="clearfix visible-xs-block"></div>
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
<div class="col-xs-6 col-sm-3">.col-xs-6 .col-sm-3</div>
</div>
</div>
<script src="./js/bootstrap.min.js"></script>
</body>
</html>效果图：

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