利用jquery each 实现多级分类下拉框显示

function get_list(obj){
if(obj.val()==0){
$('#tr_se').hide();
}else{
$.getJSON(
'/admin/index.php?app=cate_recommend&act=ajax_get_child_categories',
{'parent_id':obj.find("option:selected").attr('id')},
function(data){
var html = '<select name=\'cate_id\'>';
$.each(data,function(i,item){
html += '<option value=\''+item.cate_id+'\'>'+item.cate_name+'</option>';
if(item.has_child){
$.each(item.child,function(j,vo){
//alert(vo);
html += '<option value=\''+vo.cate_id+'\'>----'+vo.cate_name+'</option>';
});
}
}
);
html += '</select>';
$('#tr_se').show();
$('#selects').html(html);
}
);
}
}

function ajax_get_child_categories(){
$parent_id = $_GET['parent_id'];
$mod =& bm('gcategory', array('_store_id' => 0));
$gcategories = $mod->get_list($parent_id);
foreach($gcategories as $key=>$val){
$categories = $mod->get_list($val['cate_id']);
if($categories){
$gcategories[$key]['has_child'] = true;
$gcategories[$key]['child'] = $categories;
}else{
$gcategories[$key]['has_child'] = false;
}
}
echo json_encode($gcategories);exit;