效果图：
代码如下：
<!DOCTYPE HTML>
<html>
<head>
<title>联动菜单</title>
<meta charset="utf-8" />
</head>
<body>
<div id="category"></div>
<script>
/*使用 HTML DOM 的方式实现联动菜单*/
var categories=[
{"id":10,"name":'男装',"children":[
{"id":101,"name":'正装'},
{"id":102,"name":'T恤'},
{"id":103,"name":'裤衩'}
]},
{"id":20,"name":'女装',"children":[
{"id":201,"name":'短裙'},
{"id":202,"name":'连衣裙'},
{"id":203,"name":'裤子',"children":[
{"id":2031,"name":'长裤'},
{"id":2031,"name":'九分裤'},
{"id":2031,"name":'七分裤'}
]},
]},
{"id":30,"name":'童装',"children":[
{"id":301,"name":'帽子'},
{"id":302,"name":'套装',"children":[
{"id":3021,"name":"0-3岁"},
{"id":3021,"name":"3-6岁"},
{"id":3021,"name":"6-9岁"},
{"id":3021,"name":"9-12岁"}
]},
{"id":303,"name":'手套'}
]}
];
(function(arr){
var select=//创建select
document.createElement("select");
//将opt追加到select中
select.add(new Option("-请选择-",-1));
//遍历arr中每个商品类别对象
for(var i=0;i<arr.length;i++){
//将option追加到select中
select.add(
new Option(arr[i].name,arr[i].id)
);
}
var fun=arguments.callee;
//为select绑定onchange事件:
select.onchange=function(){
//this->.前的元素对象
//获得this的parent，保存在变量parent中
var parent=this.parentNode;
//反复:只要this不是parent的最后一个子节点
while(this!=parent.lastChild){
//删除parent下的最后一个子节点
parent.removeChild(parent.lastChild);
}
//获得当前select选中项的下标i
var i=this.selectedIndex;
if(i>0){//如果i>0
//获得arr中i-1位置的商品类别对象的children,保存在变量subCate
var subCate=arr[i-1].children;
//调用fun(subCate)
subCate!==undefined&&fun(subCate);
}
}
//将select追加到id为category的父元素下
document.getElementById("category")
.appendChild(select);
})(categories);
</script>
</body>
</html>
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