参考博客地址：http://chengyoyo2006.blog.163.com/blog/static/8451734820087843950604/
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>tree menu by jiarry</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<script language="Javascript" type="text/Javascript">
/**
* 隐藏或者显示菜单
* divId 子菜单所在的div元素名称
* iconId 父菜单标志（+或者-）元素名称
*/
function showhide_obj(divId, iconId) {
var obj = document.getElementById(divId);
if (obj.style.display == "none") {
open_menu(divId, iconId);
} else {
hide_menu(divId, iconId);
}
}
function set_initialization(obj,icon) {
//设置初始状态,打开第一个层;
obj = document.getElementById(obj);
icon = document.getElementById(icon);
obj.style.display = "block";
icon.src = "images/icon/minus.gif";
}
function show_this(obj) {
alert(obj);
return false;
}
// 收起所有菜单
function hide_all_menu() {
hide_menu("title1", "icon1");
hide_menu("title2", "icon2");
hide_menu("title3", "icon3");
hide_menu("title4", "icon4");
}
// 收起单个菜单
function hide_menu(divId, iconId) {
var obj1 = document.getElementById(divId);
var icon1 = document.getElementById(iconId);
obj1.style.display = "none";
icon1.innerHTML = "+";
}
//展开所有菜单
function open_all_menu() {
open_menu("title1", "icon1");
open_menu("title2", "icon2");
open_menu("title3", "icon3");
open_menu("title4", "icon4");
}
//展开单个菜单
function open_menu(divId, iconId) {
var obj1 = document.getElementById(divId);
var icon1 = document.getElementById(iconId);
obj1.style.display = "block";
icon1.innerHTML = "-";
}
</script>
<style type="text/css">
span{ width:100px;Height:25px;margin-left:15px;}
font{font-weight:bold;}
body,td{font-family:Verdana, Arial, Helvetica, sans-serif; font-size:12px;color:#333333;}
div{cursor:default;border-top:1px solid gray ; border-left:1px solid gray ;border-right:1px solid gray ;background-color:#D3F7FE ;width:120px;}
pre{background-color:#FFFFF1; border:1px solid gray;color:blue;font-family:verdana;Arial;padding:20px;}
</style>
</head>
<body onload="set_initialization('title1', 'icon1');">
<div style="line-height:25px;" id="title_first" onClick="hide_all_menu()"><font id='icon_all'>+</font>收起所有栏目</div>
<div style="line-height:25px;" id="title_all">
<div style="line-height:25px;" OnClick="showhide_obj('title1','icon1')"><font id='icon1'>+</font>栏目一</div>
<div id="title1" style="background-color:#fffff3;line-height:22px;display:none;">
<span id="menu1_1" Onclick="show_this('select1_1')"><font id='select1_1'></font>菜单一</span></font><br />
<span id="menu1_2" Onclick="show_this('select1_2')"><font id='select1_2'></font>菜单二</span></font><br />
<span id="menu1_3" Onclick="show_this('select1_3')"><font id='select1_3'></font>菜单三</span></font><br />
</div>
<div style="line-height:25px;" OnClick="showhide_obj('title2','icon2')"><font id='icon2'>+</font>栏目二</div>
<div id="title2" style="background-color:#fffff3;line-height:22px;display:none;">
<span id=m"enu2_1" Onclick="show_this('select2_1')"><font id='select2_1'></font>菜单一</span></font><br />
<span id="menu2_2" Onclick="show_this('select2_2')"><font id='select2_2'></font>菜单二</span></font><br />
<span id="menu2_3" Onclick="show_this('select2_3')"><font id='select2_3'></font>菜单三</span></font><br />
</div>
<div style="line-height:25px;" OnClick="showhide_obj('title3','icon3')"><font id='icon3'>+</font>栏目三</div>
<div id="title3" style="background-color:#fffff3;line-height:22px;display:none;">
<span id=menu3_1 Onclick="show_this('select3_1')"><font id='select3_1'></font>菜单一</span></font><br />
<span id=menu3_2 Onclick="show_this('select3_2')"><font id='select3_2'></font>菜单二</span></font><br />
<span id=menu3_3 Onclick="show_this('select3_3')"><font id='select3_3'></font>菜单三</span></font><br />
</div>
<div style="line-height:25px;" OnClick="showhide_obj('title4','icon4')"><font id='icon4'>+</font>栏目四</div>
<div id="title4" style="background-color:#fffff3;line-height:22px;display:none;">
<span id=menu4_1 Onclick="show_this('select4_1')"><font id='select4_1'></font>菜单一</span></font><br />
<span id=menu4_2 Onclick="show_this('select4_2')"><font id='select4_2'></font>菜单二</span></font><br />
<span id=menu4_3 Onclick="show_this('select4_3')"><font id='select4_3'></font>菜单三</span></font><br />
<span id=menu4_4 Onclick="show_this('select4_4')"><font id='select4_4'></font>菜单三</span></font><br />
<span id=menu4_5 Onclick="show_this('select4_5')"><font id='select4_5'></font>菜单三</span></font><br />
<span id=menu4_6 Onclick="show_this('select4_6')"><font id='select4_6'></font>菜单三</span></font><br />
</div>
</div>
<div style="line-height:25px;" id="title_last" onClick="open_all_menu()"><font id='icon_all'>+</font>展开所有栏目</div>
</body>
</html>
初始化时：
展开所有菜单时：
