如何用Mongodb复杂条件查询数组内成员?

Question

[{"_id":ObjectId("55f181e43fdda0be857daaf4"),"form_info":[{"val":"王思聪","id":"1"},{"val":"13800138000","id":"2"}],"tags":[],"__v":0},{"_id":ObjectId("55f181e43fdda0f48578acf4"),"form_info":[{"val":"李丽珍","id":"1"},{"val":"13934438010","id":"2"}],"tags":[],"__v":0}]如果我想筛选form_info数组内符合成员对象内id为1,val为王思聪且id为2,val为13800138000的记录。即结果是：[{"_id":ObjectId("55f181e43fdda0be857daaf4"),"form_info":[{"val":"王思聪","id":"1"},{"val":"13800138000","id":"2"}],"tags":[],"__v":0}]该怎么写好？谢谢大大们