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ex-041.html
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<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<meta charset="utf-8">
<style type="text/css">
.row{
overflow: hidden;
margin: 1em;
}
.card {
display: block;
margin: .5em;
}
.select, .btn{
margin-top: 1em;
margin-left: 1em;
}
</style>
<title>jquery 與 class 操作</title>
</head>
<body>
<!-- Class 請參考 http://bootstrap.hexschool.com/docs/4.0/components/card/ -->
<select class="select">
<option value="col-sm-1">col-sm-1</option>
<option value="col-sm-2">col-sm-2</option>
<option value="col-sm-3">col-sm-3</option>
<option value="col-sm-4">col-sm-4</option>
</select>
<button class="btn btn-primary">Click Me</button>
<div class="row">
<div class="card text-white bg-primary">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Primary card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
<div class="card text-white bg-secondary">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Secondary card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
<div class="card text-white bg-success">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Success card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
<div class="card text-white bg-danger">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Danger card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
<div class="card text-white bg-warning">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Warning card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
<div class="card text-white bg-info">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Info card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
<div class="card bg-light">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Light card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
<div class="card text-white bg-dark">
<div class="card-header">Header</div>
<div class="card-body">
<h5 class="card-title">Dark card title</h5>
<p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
</div>
</div>
</div>
<script src="scripts/jquery-3.1.0.js"></script>
<script>
$('.btn').on('click', function(){
$('.card').removeClass('col-sm-1');
$('.card').removeClass('col-sm-2');
$('.card').removeClass('col-sm-3');
$('.card').removeClass('col-sm-4');
$('.card').addClass($('.select').val());
});
</script>
</body>
</html>