代碼很簡單，這里主要是給大家推薦一下本代碼的實現思路，別具一格。
奉上代碼：
<!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=gb2312" />
<title>Selects</title>
<style type="text/css">
*{font-size:14px;}
select{height:20px;font-size:12px;}
</style>
</head>
<body >
<div style='color:red'>2級聯動</div>
<div id='demo1'></div><br><br><br>
<div style='color:red'>3級聯動</div>
<div id='demo2'></div><br><br><br>
<div style='color:red'>4級聯動</div>
<div id='demo3'></div><br><br><br>
<div style='color:red'>5級聯動</div>
<div id='demo4'></div><br><br><br>
<script language="javascript">
var Sys = (function(ua){
var s = {};
s.IE = ua.match(/msie ([/d.]+)/)?true:false;
s.Firefox = ua.match(/firefox//([/d.]+)/)?true:false;
s.Chrome = ua.match(/chrome//([/d.]+)/)?true:false;
s.IE6 = (s.IE&&([/MSIE (/d)/.0/i.exec(navigator.userAgent)][0][1] == 6))?true:false;
s.IE7 = (s.IE&&([/MSIE (/d)/.0/i.exec(navigator.userAgent)][0][1] == 7))?true:false;
s.IE8 = (s.IE&&([/MSIE (/d)/.0/i.exec(navigator.userAgent)][0][1] == 8))?true:false;
return s;
})(navigator.userAgent.toLowerCase());
Sys.IE6&&document.execCommand("BackgroundImageCache", false, true);
function $(Id){
return document.getElementById(Id);
};
function $$(p,e){
return p.getElementsByTagName(e);
};
function addListener(element,e,fn){
element.addEventListener?element.addEventListener(e,fn,false):element.attachEvent("on" + e,fn);
};
function removeListener(element,e,fn){
element.removeEventListener?element.removeEventListener(e,fn,false):element.detachEvent("on" + e,fn);
};
var Bind = function(object, fun) {
var args = Array.prototype.slice.call(arguments).slice(2);
return function() {
return fun.apply(object, args);
};
};
var BindAsEventListener = function(object, fun) {
var args = Array.prototype.slice.call(arguments).slice(2);
return function(event) {
return fun.apply(object, [event || window.event].concat(args));
};
};
var Extend = function(destination, source){
for (var property in source) {
destination[property] = source[property];
};
};
var Class = function(properties){
var _class = function(){return (arguments[0] !== null && this.initialize && typeof(this.initialize) == 'function') ? this.initialize.apply(this, arguments) : this;};
_class.prototype = properties;
return _class;
};
//==========================================================================================================================
var Selects = new Class({
initialize :function(container,data,title){
this.container = container;
this.num = title.length;
this.Events = new Array(title.length-1);
var i,l,select;
for(i=0; i<this.num ; i++)
{
container.innerHTML = container.innerHTML + " " + title[i];
container.appendChild(document.createElement('select'));
}
select = $$(container,'select')[0];
for(i=0,l=data.length;i<l;i++)
select.options.add(new Option(data[i].txt,i));
addListener(select,'change',Bind(this,this.Change,select,data,0));
this.Change(select,data,0);
},
Change : function(obj,data,num){
if(num == this.num-1)return;
var menu = data[obj.value].menu;
select = $$(this.container,'select')[num+1];
select.length = 0;
if(!menu)return;
if(this.Events[num]!=undefined)removeListener(select,'change',this.Events[num])
this.Events[num] = Bind(this,this.Change,select,menu,num+1)
addListener(select,'change',this.Events[num]);
for(var i=0,l=menu.length;i<l;i++)
select.options.add(new Option(menu[i].txt,i));
this.Change(select,menu,num+1);
}
});
//==========================================================================================================================
window.onload = function(){
var data=[{"txt":"人族","menu":[{"txt":"大法師","menu":[{"txt":"大法技能","menu":[{"txt":"水元素","menu":[{"txt":"召喚物"},{"txt":"穿刺攻擊"},{"txt":"很好東西"}]},{"txt":"暴風雪","menu":[{"txt":"魔法攻擊"},{"txt":"面積傷害"},{"txt":"很漂亮"},{"txt":"可被打斷"}]},{"txt":"輝煌光環"},{"txt":"瞬間移動"}]},{"txt":"英雄說明","menu":[{"txt":"智力英雄"},{"txt":"強大光環"},{"txt":"輔助型"},]}]},{"txt":"山丘之王","menu":[{"txt":"山丘技能","menu":[{"txt":"風暴之錘"},{"txt":"錐地"},{"txt":"錐暈"},{"txt":"天神下凡"}]},{"txt":"英雄說明","menu":[{"txt":"力量英雄"},{"txt":"秒殺能力"},{"txt":"個子很矮"},{"txt":"大技變態"}]}]},{"txt":"圣騎士","menu":[{"txt":"圣騎技能","menu":[{"txt":"光"},{"txt":"無敵"},{"txt":"光環"},{"txt":"復活"}]},{"txt":"英雄說明","menu":[{"txt":"力量英雄"},{"txt":"輔助英雄"},{"txt":"人稱奶媽"}]}]},{"txt":"血法師","menu":[{"txt":"血法技能","menu":[{"txt":"火焰"},{"txt":"吸藍"},{"txt":"虛無"},{"txt":"神鳥鳳凰"}]},{"txt":"英雄說明","menu":[{"txt":"智力英雄"},{"txt":"輔助英雄"},{"txt":"長的很帥"}]}]}]},{"txt":"獸族","menu":[{"txt":"賤圣","menu":[{"txt":"賤圣技能","menu":[{"txt":"疾風步"},{"txt":"影分身"},{"txt":"致命一擊"},{"txt":"劍刃風暴"}]},{"txt":"英雄說明","menu":[{"txt":"敏捷英雄"},{"txt":"高攻英雄"},{"txt":"殺人越貨"},{"txt":"猥褻無敵"},{"txt":"非常強大"}]}]},{"txt":"先知男","menu":[{"txt":"先知技能","menu":[{"txt":"狼"},{"txt":"日"},{"txt":"閃電鏈"},{"txt":"地震"}]},{"txt":"英雄說明","menu":[{"txt":"智力英雄"},{"txt":"騷擾英雄"}]}]},{"txt":"牛頭人酋長","menu":[{"txt":"牛頭技能","menu":[{"txt":"沖擊波"},{"txt":"陣地"},{"txt":"耐久光環"},{"txt":"復活"}]},{"txt":"英雄說明","menu":[{"txt":"力量英雄"},{"txt":"魔法強大"},{"txt":"長的威猛"},{"txt":"一個肉盾"}]}]},{"txt":"小YY","menu":[{"txt":"小Y技能","menu":[{"txt":"變動物"},{"txt":"治療波"},{"txt":"小蛇棒子"},{"txt":"全體無敵"}]},{"txt":"英雄說明","menu":[{"txt":"敏捷英雄"},{"txt":"魔法強大"},{"txt":"輔助英雄"}]}]}]},{"txt":"不死族","menu":[{"txt":"死亡騎士","menu":[{"txt":"亡騎技能","menu":[{txt:"大便一拓"},{txt:"邪惡光環"},{txt:"死亡契約"},{txt:"復活亡靈"}]},{"txt":"英雄說明","menu":[{txt:"騎的是羊"},{txt:"未老先衰"},{txt:"冰霜之哀"},{txt:"啊而塞思"}]}]},{"txt":"巫妖","menu":[{"txt":"巫妖技能","menu":[{txt:"暴冰"},{txt:"冰甲"},{txt:"契約"},{txt:"死亡凋零"}]},{"txt":"英雄說明","menu":[{txt:"穿裙子"},{txt:"全是骨頭"},{txt:"不男不女"}]}]},{"txt":"恐懼魔王","menu":[{"txt":"魔王技能"},{"txt":"英雄說明"}]},{"txt":"小強王子","menu":[{"txt":"王子技能"},{"txt":"英雄說明"}]}]}];
new Selects($('demo1'),data,["種族","英雄"]);
new Selects($('demo2'),data,["種族","英雄","介紹"]);
new Selects($('demo3'),data,["種族","英雄","介紹","技能"]);
new Selects($('demo4'),data,["種族","英雄","介紹","技能","技能說明"]);
}
</script>
</body>
</html>
