JS通用无限极树形菜单实现：支持JSON与数组混合数据

通用树形菜单数据适配说明

对数据格式进行了适配优化，使得生成的树形菜单能够同时兼容JSON对象、数组以及两者混合的数据结构，无需预先定义特定的键名即可通用处理。

 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="http://d1.lashouimg.com/static/js/release/jquery-1.4.2.min.js"></script>
<title>JS无级树树形菜单,json格式，数组格式通用</title>
<style type="text/css">
.menuTree
{ 
margin-left: -30px;
} 
.menuTree div
{ 
padding-left: 30px;
} 
.menuTree div ul
{ 
overflow: hidden;
display: none;
height: auto;
} 
.menuTree span
{ 
display: block;
height: 25px;
line-height: 25px;
padding-left: 5px;
margin: 1px 0;
cursor: pointer;
border-bottom: 1px solid #CCC;
} 
.menuTree span:hover
{ 
background-color: #e6e6e6;
color: #cf0404;
} 
.menuTree a
{ 
color: #333;
text-decoration: none;
} 
.menuTree a:hover
{ 
color: #06F;
} 
.btn
{ 
height: 30px;
margin-top: 10px;
border-bottom: 1px solid #CCC;
} 
</style>
</head>
<body>
<div class="btn">
<input name="" type="button" id="btn_open" value="全部展开" />&nbsp;&nbsp;
<input name="" type="button" id="btn_close" value="全部收缩" />
</div>
<div id="menuTree" class="menuTree">
</div>
</body>
</html>
核心JavaScript逻辑实现<script type="text/javascript">
var json = { "navnums": { "0": "8051", "4": "4969", "8": "206", "5": "126", "9": "2174" }, "hotwords": "美食", "mvonline": [9, 8, [9, 8, 7, 6, 5, 4], 6, 5, 4], "district_online": "1", "zone_online": "1", "subway_online": "1", "city_online": "1" };
/*递归实现获取无级树数据并生成DOM结构*/
var str = "";
var forTree = function (o) {
var urlstr = "";
var keys = new Array();
for (var key in o) {
keys.push(key);
} 
for (var j = 0; j < keys.length; j++) {
k = keys[j];
if (typeof o[k] == "object") {
urlstr = "<div><span>" + k + "</span><ul>";
} else {
urlstr = "<div><span>" + k + "=" + o[k] + "</span><ul>";
} 
str += urlstr;
var kcn = 0;
if (typeof o[k] == "object") {
for (var kc in o[k]) {
kcn++;
} 
} 
if (kcn > 0) {
forTree(o[k]);
} 
str += "</ul></div>";
} 
return str;
} 
/*添加无级树*/
document.getElementById("menuTree").innerHTML = forTree(json);
/*树形菜单*/
var menuTree = function () {
//给有子对象的元素加[+-]
$("#menuTree ul").each(function (index, element) {
var ulContent = $(element).html();
var spanContent = $(element).siblings("span").html();
if (ulContent) {
$(element).siblings("span").html("[+] " + spanContent)
} 
}); 
$("#menuTree").find("div span").click(function () {
var ul = $(this).siblings("ul");
var spanStr = $(this).html();
var spanContent = spanStr.substr(3, spanStr.length);
if (ul.find("div").html() != null) {
if (ul.css("display") == "none") {
ul.show(300);
$(this).html("[-] " + spanContent);
} else {
ul.hide(300);
$(this).html("[+] " + spanContent);
} 
} 
}) 
} () 
/*展开*/
$("#btn_open").click(function () {
$("#menuTree ul").show(300);
curzt("-");
}) 
/*收缩*/
$("#btn_close").click(function () {
$("#menuTree ul").hide(300);
curzt("+");
}) 
function curzt(v) {
$("#menuTree span").each(function (index, element) {
var ul = $(this).siblings("ul");
var spanStr = $(this).html();
var spanContent = spanStr.substr(3, spanStr.length);
if (ul.find("div").html() != null) {
$(this).html("[" + v + "] " + spanContent);
} 
}); 
} 
</script>