Destroyed 依据教师年级获取课程一级分类接口 (markdown)

-###接口地址
-
->     /teacher/catalogs/getting
-
-###请求方式
-
->     get请求
-
-###请求参数
-
->     "fit_grade":"初一"
->     年级fit_grade为单选
-
-###返回值
-######正常返回值
-```json
-{
-  "success": [
-    "教材",
-    "文章",
-    "发音",
-    "对话",
-    "词汇",
-    "测验",
-    "私人定制"
-  ]
-}
-```
-
-######异常返回值
-```json
-{
-  "failed": "教师选择的年级存在错误"
-}
-```
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