多级联动菜单

<!DOCTYPE HTML>
<html>
<head>
<title>联动菜单</title>
<meta charset="utf-8" />
<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":2032,"name":'九分裤'},
      {"id":2033,"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":3022,"name":"3-6岁"},
      {"id":3023,"name":"6-9岁"},
      {"id":3024,"name":"9-12岁"}
   ]},
   {"id":303,"name":'手套'}
]}
];
   //专门遍历一级分类，创建select
   function loadData(data){//保存了当前同级分类的数组
       //创建一个select对象
      var select=document.createElement("select");
      select.add(new Option("--请选择--"))
      //遍历data数组对象
      for(var i=0;i<data.length;i++){
         //创建一个option来存储遍历data中的数据
         select.add(new Option(data[i].name,data[i].id))
      }
      //将代码片段追加到id为category的节点之中
      document.querySelector("#category").appendChild(select);
      //当选择了option之后动态添加之后的子节点select
      select.onchange=function(){
         while(this.parentNode.lastChild!=this){//此处为什么要用while没有想清楚,后面想清楚了，因为需要去除所有的lastChild
            this.parentNode.removeChild(this.parentNode.lastChild);
         }
         if(data[this.selectedIndex-1].children){
            loadData(data[this.selectedIndex-1].children);
         }
      }
   }
   window.onload=function(){
      loadData(categories);
   }
</script>
</head>
<body>
   <div id="category"></div>
</body>
</html>
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