http://jsfiddle.net/jhfrench/GpdgF/

把原文的i标签中的图标显示出来；

源码：

     
                            
      
                                
       
 Parent Goes somewhere                                    
        
                                        
         
Child                                            Goes somewhere                                            
          
 
           
 Grand Child Goes somewhere
 
          
                                    
        
                                
       
 Parent2 Goes somewhere                                    
        
                                        
         
 Child Goes somewhere
                                    
        
                            
      
                        
     

css:

.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;    width:1px}.tree li::after {    border-top:1px solid #999;    height:20px;    top:25px;    width: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}

js:

$(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();            });});