谁有兴趣的话可以改成动态加载数据，或者用jquery，代码肯定会少很多！我发现添加一些css，这棵树在静态页面还是大有用途的！ <style type="text/css"> .expand{ cursor:pointer; } .hide{ cursor:pointer; } </style> <script type="text/javascript"> function toggleChild(o) { var cls = o.getAttribute("class"); if (cls == "expand") { var sb = o.nextSibling; if (window.innerWidth) sb = sb.nextSibling; while (sb != null && sb.tagName.toLowerCase() == 'dd') { sb.style.display = "none"; sb = sb.nextSibling; if (window.innerWidth) sb = sb.nextSibling; } o.removeAttribute("class"); o.setAttribute("class", "hide"); if (window.innerWidth) //ff o.textContent = "田" + o.textContent.substring(1); else o.innerText = "田" + o.innerText.substring(1); } else { var sb = o.nextSibling; if (window.innerWidth) sb = sb.nextSibling; while (sb != null && sb.tagName.toLowerCase() == 'dd') { sb.style.display = ""; sb = sb.nextSibling; if (window.innerWidth) sb = sb.nextSibling; } o.removeAttribute("class"); o.setAttribute("class", "expand"); if (window.innerWidth) //ff o.textContent = "曰" + o.textContent.substring(1); else o.innerText = "曰" + o.innerText.substring(1); } } function maketree(obj) { var dts = obj.getElementsByTagName('dt'); for (var i = 0; i < dts.length; i++) { dts[i].setAttribute("class", "expand"); if (window.innerWidth) //ff dts[i].textContent = "曰" + dts[i].textContent; else dts[i].innerText = "曰" + dts[i].innerText; dts[i].onclick = function() { toggleChild(this); }; } } window.onload = function() { maketree(document.getElementById("tree")); }; </script> <h3>定义列表也能变成一棵树：</h3> <dl id="tree"> <dt>菜单1</dt> <dd>1.1 aaa</dd> <dd>1.2 bbb</dd> <dd>1.3 ccc</dd> <dt>菜单2</dt> <dd>2.1 你好</dd> <dd><a href="http://www.baidu.com">超链接</a></dd> <dt>菜单3</dt> <dd> <dl style="margin-top:2px; margin-bottom:2px;"> <dt>3.1</dt> <dd><a href="http://news.baidu.com">百度新闻</a></dd> <dd><a href="http://news.sohu.com">搜狐新闻</a></dd> <dt>3.2</dt> <dd><a href="http://news.baidu.com">百度新闻</a></dd> <dd><a href="http://news.sohu.com">搜狐新闻</a></dd> </dl> </dd> </dl> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
