bootstrap 树

<div class="tree well">
                            <ul>
                                <li><span><i
                                        class="glyphicon glyphicon-folder-open"></i> Parent</span> <a
                                    href="">Goes somewhere</a>
                                    <ul>
                                        <li><span><i class="glyphicon glyphicon-minus"></i>Child</span>
                                            <a href="">Goes somewhere</a>
                                            <ul>
                                                <li><span><i class="glyphicon glyphicon-leaf"></i>
                                                        Grand Child</span> <a href="">Goes somewhere</a></li>
                                            </ul></li>
                                    </ul></li>
                                <li><span><i class="icon-folder-open"></i> Parent2</span> <a
                                    href="">Goes somewhere</a>
                                    <ul>
                                        <li><span><i class="icon-leaf"></i> Child</span> <a
                                            href="">Goes somewhere</a></li>
                                    </ul></li>
                            </ul>
                        </div>

.tree {
    min-height:20px;
    padding:19px;
    margin-bottom:20px;
    background-color:#fbfbfb;
    border:1px solid #999;
    -webkit-border-radius:4px;
    -moz-border-radius:4px;
    border-radius:4px;
    -webkit-box-shadow:inset 0 1px 1px rgba(0, 0, 0, 0.05);
    -moz-box-shadow:inset 0 1px 1px rgba(0, 0, 0, 0.05);
    box-shadow:inset 0 1px 1px rgba(0, 0, 0, 0.05)
}
.tree li {
    list-style-type:none;
    margin:0;
    padding:10px 5px 0 5px;
    position:relative
}
.tree li::before, .tree li::after {
    content:'';
    left:-20px;
    position:absolute;
    right:auto
}
.tree li::before {
    border-left:1px solid #999;
    bottom:50px;
    height:100%;
    top:0;
    1px
}
.tree li::after {
    border-top:1px solid #999;
    height:20px;
    top:25px;
    25px
}
.tree li span {
    -moz-border-radius:5px;
    -webkit-border-radius:5px;
    border:1px solid #999;
    border-radius:5px;
    display:inline-block;
    padding:3px 8px;
    text-decoration:none
}
.tree li.parent_li>span {
    cursor:pointer
}
.tree>ul>li::before, .tree>ul>li::after {
    border:0
}
.tree li:last-child::before {
    height:30px
}
.tree li.parent_li>span:hover, .tree li.parent_li>span:hover+ul li span {
    background:#eee;
    border:1px solid #94a0b4;
    color:#000
}

$(function() {
    $('.tree li:has(ul)').addClass('parent_li').find(' > span').attr('title',
            '点击收缩');
    $('.tree li.parent_li > span').on(
            'click',
            function(e) {
                var children = $(this).parent('li.parent_li')
                        .find(' > ul > li');
                if (children.is(":visible")) {
                    children.hide('fast');
                    $(this).attr('title', '点击展开').find(' > i').addClass(
                            'glyphicon-plus').removeClass('glyphicon-minus');
                } else {
                    children.show('fast');
                    $(this).attr('title', '点击收缩').find(' > i').addClass(
                            'glyphicon-minus').removeClass('glyphicon-plus');
                }
                e.stopPropagation();
            });
});