因專案需要做了一個select 的多級分類：

以下程式碼用到了jquery庫

<select onchange="categoryChange(this,'')">

      <option value="1">LED</option>

      <option value="2">電子牛</option>

      <option value="3">透鏡</option>

</select>

var test = {"1":{"LED":{"5":"3000K","6":{"4000K":{"7":{"16mm":{"9":"成功!"}},"8":{"18mm":{"10":"tset","11":"test2"}}}}}},"2":"電子牛","3":"透鏡","4":"五金件"} //返回一個物件的鍵值對,attr=>value function objPropName(obj){ var result=''; for(var p in obj){ if(jQuery.isPlainObject(obj[p])) for(var pp in obj[p]) result = result+',"'+p+'":"'+pp+'"'; else result = result+',"'+p+'":"'+obj[p]+'"'; } return '{'+result.substring(1)+'}'; } function categoryChange(obj,str_index){ var category1_choose_value = obj.value; var category1_choose_name = obj.options[obj.selectedIndex].text; str_index_cur = str_index+"['"+category1_choose_value+"']['"+category1_choose_name+"']"; var choosed_obj = eval('(category_json'+str_index_cur+')'); $(obj).next().remove(); if(jQuery.isPlainObject(choosed_obj)){ category2data_str = objPropName(choosed_obj); category2data = eval('('+category2data_str+')'); str_index_cur = str_index_cur.replace(////g,"////"); str_index_cur = str_index_cur.replace(//'/g,"//'"); alert(str_index_cur); var str = '<select onchange="categoryChange(this,/''+str_index_cur+'/')">'; $.each(category2data,function(i){ str = str+'<option value="'+i+'">'+category2data[i]+'</option>'; }); str = str+'</select>'; $(obj).after(str); }else{ alert(category1_choose_value); } }