数据量少的话，for就好了，要是有多级结构，最好用数组的形式（JSON多几层没关系，关键是结构清晰，方便扩展）：
{
[
{"main_1":{"data":{"cid" : "1","name" : "品牌1","pid" : "0"},"Sub":"[
{"main_1":{"data":{"cid" : "1","name" : "品牌1","pid" : "0"}}},
...
]"}},
{"main_2":{"data":{"cid" : "1","name" : "品牌1","pid" : "0"},"Sub":"[...]"}}，
...
]
}
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