JS无限极树形菜单,json格式、数组格式通用示例_javascript技巧

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 = "" + k + "";
} else {
urlstr = "" + k + "=" + o[k] + "";
}
str += urlstr;
var kcn = 0;
if (typeof o[k] == "object") {
for (var kc in o[k]) {
kcn++;
}
}
if (kcn > 0) {
forTree(o[k]);
}
str += "";
}
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);
}
});
}