mui 处理 json 数据跟 js 一样么，还是用 js 处理啊

mui.init();
mui.plusReady(function(){
mui.ajax('http://192.168.3.250/api.php',{
data:{
act:'categories_tree',
},
dataType:'json',
type:'post',
timeout:10000,
success:function(data){
var jsonobj=eval('('+data+')');

                $.each(jsonobj,function(index,item){    
                    $.each(item,function(idx,item_c){  
                        alert(item_c.name);   
                    });  

                })   
            },   
            error:function(xhr,type,errorThrown){  
                    //异常处理；  
                    alert('网络异常！');  
            }  
        })  

    })  

上面是 js 代码，获取分类的 ，，下面是返回的 json 数据 ，怎么办？

{"39":{"id":"39","name":"\u670d\u88c5\u914d\u9970","url":"category.php?id=39","cat_id":{"124":{"id":"124","name":"\u5185\u8863","url":"category.php?id=124","cat_id":{"185":{"id":"185","name":"\u6587\u80f8","url":"category.php?id=185","cat_id":[]},"186":{"id":"186","name":"\u79cb\u8863\u79cb\u88e4","url":"category.php?id=186","cat_id":[]},"188":{"id":"188","name":"\u6587\u80f8\u5957\u88c5","url":"category.php?id=188","cat_id":[]},"191":{"id":"191","name":"\u5973\u58eb\u5185\u88e4","url":"category.php?id=191","cat_id":[]},"192":{"id":"192","name":"\u7537\u58eb\u5185\u88e4","url":"category.php?id=192","cat_id":[]},"198":{"id":"198","name":"\u6253\u5e95\u88e4\u889c","url":"category.php?id=198","cat_id":[]},"201":{"id":"201","name":"\u5c11\u5973\u6587\u80f8","url":"category.php?id=201","cat_id":[]}}}}},"3":{"id":"3","name":"\u5bb6\u5c45\u5bb6\u88c5","url":"category.php?id=3","cat_id":{"287":{"id":"287","name":"\u5bb6\u7eba\u7528\u54c1","url":"category.php?id=287","cat_id":{"358":{"id":"358","name":"\u56db\u4ef6\u5957","url":"category.php?id=358","cat_id":[]},"367":{"id":"367","name":"\u88ab\u82af","url":"category.php?id=367","cat_id":[]},"368":{"id":"368","name":"\u51ac\u88ab","url":"category.php?id=368","cat_id":[]},"370":{"id":"370","name":"\u6795\u82af","url":"category.php?id=370","cat_id":[]},"373":{"id":"373","name":"\u65b0\u54c1","url":"category.php?id=373","cat_id":[]},"1282":{"id":"1282","name":"\u9664\u5473\u7528\u54c1","url":"category.php?id=1282","cat_id":[]}}}}},"43":{"id":"43","name":"\u6574\u8f66\u914d\u4ef6","url":"category.php?id=43","cat_id":{"234":{"id":"234","name":"\u5185\u5916\u9970\u54c1","url":"category.php?id=234","cat_id":{"1167":{"id":"1167","name":"\u5ea7\u57ab","url":"category.php?id=1167","cat_id":[]},"1176":{"id":"1176","name":"\u9664\u5473\u70ad\u5305","url":"category.php?id=1176","cat_id":[]}}}}},"1283":{"id":"1283","name":"\u519c\u526f\u4ea7\u54c1","url":"category.php?id=1283","cat_id":{"1284":{"id":"1284","name":"\u517b\u6b96\u6c34\u4ea7","url":"category.php?id=1284","cat_id":{"1285":{"id":"1285","name":"\u732a\u8089","url":"category.php?id=1285","cat_id":[]},"1286":{"id":"1286","name":"\u5927\u9ec4\u9c7c","url":"category.php?id=1286","cat_id":[]},"1290":{"id":"1290","name":"\u67f4\u9e21","url":"category.php?id=1290","cat_id":[]},"1291":{"id":"1291","name":"\u67f4\u9e21\u86cb","url":"category.php?id=1291","cat_id":[]}}},"1287":{"id":"1287","name":"\u79cd\u690d\u679c\u852c","url":"category.php?id=1287","cat_id":{"1288":{"id":"1288","name":"\u7389\u7c73","url":"category.php?id=1288","cat_id":[]},"1289":{"id":"1289","name":"\u5c71\u6942\u6c41","url":"category.php?id=1289","cat_id":[]},"1292":{"id":"1292","name":"\u751c\u6912","url":"category.php?id=1292","cat_id":[]}}}}}}