学用纯CSS打造可折叠树状菜单

<li>
<label for="subsubfolder1">下级</label>
<input id="subsubfolder1" type="checkbox" />
<ol>
<li class="file"><a>下级</a></li>
<li>
<label for="subsubfolder2">下级</label>
<input id="subsubfolder2" type="checkbox" />
<ol>
<li class="file"><a>无限级</a></li>
<li class="file"><a>无限级</a></li>
<li class="file"><a>无限级</a></li>
<li class="file"><a>无限级</a></li>
<li class="file"><a>无限级</a></li>
<li class="file"><a>无限级</a></li>
</ol>
</li>
</ol>
</li>

li input {
position:absolute;left:0;margin-left:0;opacity:0;z-index:2;cursor:pointer;height:1em;width:1em;top:0;
}
input + ol {
display:none;
}
input + ol > li { 
height:0;overflow:hidden;margin-left:-14px!important;padding-left:1px; 
}
li label {
cursor:pointer;display:block;padding-left:17px;background:url(toggle-small-expand.png) no-repeat 0px 1px;
}
input:checked + ol {
background:url(toggle-small.png) 44px 5px no-repeat;margin:-22px 0 0 -44px;padding:27px 0 0 80px;height:auto;display:block;
}
input:checked + ol > li {
height:auto;
}