今天用js做了一个三级联动菜单，发现这种东西还是蛮费脑力的，要被这个对象给搞蒙了！以下是我分享出来的代码，希望对大家有帮助！
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<title>三级联动菜单</title>
</head>
<body>
<form action="" name="form1">
<select name='province' οnchange="getCity();">
<option value="">==请选择省份==</option>
</select>
<select name='city' οnchange='getCountry();'>
<option value="">==请选择城市==</option>
</select>
<select name="country">
<option value="">==请选择区域==</option>
</select>
</form>
<script type="text/javascript">
var array=[
{name:'湖南省',cities:[{name:'长沙市',countries:['岳麓区','天心区','雨花区','望城区']},
{name:'岳阳市',countries:['平江县','岳阳楼','洞庭湖']}
]},
{name:'湖北省',cities:[{name:'武汉市',countries:['武汉区','武冈区','硅谷区','东湖区']},
{name:'武冈市',countries:['黄花区','黄花去1','黄花区12','黄花去12']}
]},
{name:'北京省',cities:[{name:'北京市',countries:['北京1区','北京1区','北京1区','北京1区']},
{name:'北京市',countries:['北京2区','北京2区','北京2区','北京2区']}
]}
]
var province=document.form1.province;
var city=document.form1.city;
var country=document.form1.country;
window.οnlοad=function(){
for(var i=0;i<array.length;i++){
province[i+1]=new Option(array[i].name,array[i].name);
}
}
function getCity(){
var proIndex=province.selectedIndex;
alert(proIndex);
var selectedCity=array[proIndex-1].cities;
for(var i=0;i<selectedCity.length;i++){
city[i+1]=new Option(selectedCity[i].name,selectedCity[i].name);
}
}
function getCountry(){
var proIndex=province.selectedIndex;
var selectedCity=array[proIndex-1].cities;
var cityIndex=city.selectedIndex;
var selectedCountry=selectedCity[cityIndex-1].countries;
for(var i=0;i<selectedCountry.length;i++){
country[i+1]=new Option(selectedCountry[i],selectedCountry[i])
}
}
</script>
</body>
</html>
![实现计算器功能[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)