案例:Bootstrap案例     状态:可编辑再运行    进入竖版
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<!DOCTYPE html>
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<html>
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<head>
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    <meta charset="utf-8"> 
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    <title>Bootstrap 实例 - 折叠(Collapse)插件方法</title>
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    <link rel="stylesheet" href="/css/bootstrap/bootstrap3.3.7.min.css">
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    <script src="/js/bootstrap/jquery.min.js"></script>
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    <script src="/js/bootstrap/bootstrap3.3.7.min.js"></script>
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</head>
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<body>
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<div class="panel-group" id="accordion">
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    <div class="panel panel-default">
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        <div class="panel-heading">
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            <h4 class="panel-title">
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                <a data-toggle="collapse" data-parent="#accordion" 
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                   href="#collapseOne">
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                    点击我进行展开,再次点击我进行折叠。第 1 部分--hide 方法
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                </a>
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            </h4>
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        </div>
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        <div id="collapseOne" class="panel-collapse collapse in">
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            <div class="panel-body">
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                Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred 
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                nesciunt sapiente ea proident. Ad vegan excepteur butcher vice 
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                lomo.
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            </div>
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        </div>
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    </div>
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    <div class="panel panel-success">
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        <div class="panel-heading">
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            <h4 class="panel-title">
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                <a data-toggle="collapse" data-parent="#accordion" 
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                   href="#collapseTwo">
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                    点击我进行展开,再次点击我进行折叠。第 2 部分--show 方法
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                </a>
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            </h4>
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        </div>
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        <div id="collapseTwo" class="panel-collapse collapse">
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            <div class="panel-body">
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                Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred 
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                nesciunt sapiente ea proident. Ad vegan excepteur butcher vice 
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                lomo.
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            </div>
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        </div>
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    </div>
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    <div class="panel panel-info">
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        <div class="panel-heading">