这是一款bootstrap手风琴菜单美化效果。该bootstrap手风琴菜单在原生bootstrap accordion的基础上，通过简单的CSS代码来进行美化，生成更加漂亮的bootstrap手风琴菜单效果。

使用方法

在页面中引入jquery和bootstrap相关文件，以及font-awesome字体图标文件。

<link href="path/to/css/bootstrap.min.css" rel="stylesheet">
<link href="path/to/css/font-awesome.min.css" rel="stylesheet">
<script src="path/to/js/bootstrap.min.js"></script>
<script src="path/to/js/bootstrap.min.js"></script>
HTML结构

该bootstrap手风琴菜单的基本HTML结构如下。

<div class="container">
    <div class="row">
        <div class="col-md-offset-3 col-md-6">
            <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
                <div class="panel panel-default">
                    <div class="panel-heading" role="tab" id="headingOne">
                        <h4 class="panel-title">
                            <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
                                Section 1
                            </a>
                        </h4>
                    </div>
                    <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
                        <div class="panel-body">
                            <p>手风琴内容1</p>
                        </div>
                    </div>
                </div>

                <div class="panel panel-default">
                    <div class="panel-heading" role="tab" id="headingTwo">
                        <h4 class="panel-title">
                            <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                                Section 2
                            </a>
                        </h4>
                    </div>
                    <div id="collapseTwo" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo">
                        <div class="panel-body">
                            <p>手风琴内容2</p>
                        </div>
                    </div>
                </div>

                <div class="panel panel-default">
                    <div class="panel-heading" role="tab" id="headingThree">
                        <h4 class="panel-title">
                            <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
                                Section 3
                            </a>
                        </h4>
                    </div>
                    <div id="collapseThree" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree">
                        <div class="panel-body">
                            <p>手风琴内容3 </p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
CSS样式

为该bootstrap手风琴菜单添加下面的CSS样式，来对其进行美化。

a:hover,a:focus{
    text-decoration: none;
    outline: none;
}
#accordion .panel{
    border: none;
    box-shadow: none;
    border-radius: 10px;
    margin-bottom: 10px;
}
#accordion .panel-heading{
    padding: 0;
    border: none;
    border-radius: 10px;
}
#accordion .panel-title a{
    display: block;
    padding: 20px 35px;
    font-size: 20px;
    font-weight: 600;
    color: #fff;
    background: #888bc2;
    border: none;
    position: relative;
    transition: all 0.3s ease 0s;
}
#accordion .panel-title a:after,
#accordion .panel-title a.collapsed:after{
    content: "\f068";
    font-family: fontawesome;
    width: 40px;
    height: 40px;
    line-height: 32px;
    border-radius: 50%;
    background: #888bc2;
    text-align: center;
    font-size: 15px;
    color:#fff;
    border: 5px solid #fff;
    position: absolute;
    top: 10px;
    left: -20px;
    transition: all 0.3s ease 0s;
}
#accordion .panel-title a.collapsed:after{
    content: "\f067";
}
#accordion .panel-title a:hover:after,
#accordion .panel-title a.collapsed:hover:after{
    transform: rotate(360deg);
}
#accordion .panel-body{
    padding: 15px 25px;
    background: #fff;
    font-size: 14px;
    color: #8c8c8c;
    line-height: 25px;
    border-top: none;
    position: relative;
}