html 实例源码
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<!DOCTYPE html>2
<html>3
<head>4
<title>Bootstrap 实例</title>5
<meta charset="utf-8">6
<meta name="viewport" content="width=device-width, initial-scale=1">7
<link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">8
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>9
<script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>10
<script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>11
</head>12
<body>13
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<!DOCTYPE html>15
<html lang="en">16
<head>17
<title>Bootstrap Example</title>18
<meta charset="utf-8">19
<meta name="viewport" content="width=device-width, initial-scale=1">20
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">21
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>22
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>23
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>24
</head>25
<body> 26
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<div class="container mt-3">28
<h2>内容排列</h2>29
<p>.justify-content-*-between 根据不同屏幕设备使用 "between" 显示弹性子元素</p>30
<p>重置浏览器窗口，查看效果。</p>31
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<p><code>.justify-content-between</code>:</p>33
<div class="d-flex justify-content-between bg-secondary mb-3">34
<div class="p-2 bg-info">Flex item 1</div>35
<div class="p-2 bg-warning">Flex item 2</div>36
<div class="p-2 bg-primary">Flex item 3</div>37
</div>38
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<p><code>.justify-content-sm-between</code>:</p>40
<div class="d-flex justify-content-sm-between bg-secondary mb-3">41
<div class="p-2 bg-info">Flex item 1</div>42
<div class="p-2 bg-warning">Flex item 2</div>43
<div class="p-2 bg-primary">Flex item 3</div>44
</div>45
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<p><code>.justify-content-md-between</code>:</p>47
<div class="d-flex justify-content-md-between bg-secondary mb-3">48
<div class="p-2 bg-info">Flex item 1</div>49
<div class="p-2 bg-warning">Flex item 2</div>50
<div class="p-2 bg-primary">Flex item 3</div>51
</div>52
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<p><code>.justify-content-lg-between</code>:</p>54
<div class="d-flex justify-content-lg-between bg-secondary mb-3">55
<div class="p-2 bg-info">Flex item 1</div>56
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