Updated 在线授课接口定义 (markdown)

@@ -675,3 +675,31 @@ Response Body:
   "returnMsg": "工单不存在"
 }
 ```
+
+#上报学生已在线接口
+
+接口地址：/teaching/callback/student_online
+
+Request Method：POST
+
+Request Body:
+
+```
+{
+    "user_id":12938,
+    "report_time":"2016-08-03 19:54:10"
+}
+
+```
+
+Response Body:
+
+```
+
+{
+  "data": {},
+  "returnCode": 200,
+  "returnMsg": "success"
+}
+```
+