+++ post:/Student/joinClasses *uid#学生uid *schoolid#学校id *gccode#多个数组格式（eg：gccode[0][gradeid]=1&gccode[0][classid]=2&gccode[0][code]=3&gccode[1][gradeid]=1&gccode[1][classid]=2&gccode[1][code]=3...） <<< success { "ret": 0, "msg": "ok" } <<< error { "ret": -1, "msg": "未知错误" } +++