 
<!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無級樹樹形菜單,json格式，數(shù)組格式通用</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="全部展開" />&nbsp;&nbsp; 
<input name="" type="button" id="btn_close" value="全部收縮" /> 
</div> 
<div id="menuTree" class="menuTree"> 
</div> 
</body> 
</html> 
<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" }; 
/*遞歸實(shí)現(xiàn)獲取無級樹數(shù)據(jù)并生成DOM結(jié)構(gòu)*/ 
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; 
} 
/*添加無級樹*/ 
document.getElementById("menuTree").innerHTML = forTree(json); 
/*樹形菜單*/ 
var menuTree = function () { 
//給有子對象的元素加[+-] 
$("#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); 
} 
} 
}) 
} () 

/*展開*/ 
$("#btn_open").click(function () { 
$("#menuTree ul").show(300); 
curzt("-"); 
}) 
/*收縮*/ 
$("#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> 