doc api

@@ -70,7 +70,7 @@ public static class Response {
 ##### 3. 微信用户获取全部的教材版本、年级信息
 
 - URL: {{localhost}}/boxfish-online-card/textbook/version/getTextbookGrade
-- Method: GET
+- Method: POST
 - RequestBody: `json字符串`
 
 
@@ -107,9 +107,14 @@ public static class Response {
 
 ##### 5. 查询已经领取的教材信息、邀请的用户信息
 
-- URL: {{localhost}}/boxfish-online-card/textbook/obtain/getObtainTextbook?openId=${{openId}}
-- Method: GET
-- Requestparam: `openId`
+- URL: {{localhost}}/boxfish-online-card/textbook/obtain/getObtainTextbook
+- Method: POST
+- RequestBody:
+```json
+{
+  "openId": "wx_user_openId"
+}
+```
 
 - ResponseBody:
 
@@ -145,9 +150,14 @@ public static class WxUserInfo {
 
 ##### 6. 缺用户是否已经建立过绑定关系，如果建立过，返回之前绑定关系的邀请码
 
-- URL: {{localhost}}/boxfish-online-card/wxUser/confirm?openId={{openId}}
-- Method: GET
-- Requestparam: `openId`
+- URL: {{localhost}}/boxfish-online-card/wxUser/confirm
+- Method: POST
+- RequestBody:
+```json
+{
+  "openId": "wx_user_openId"
+}
+```
 
 - ResponseBody: