Updates 家长端服务/接口文档.md

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@@ -45,7 +45,7 @@ POST https://api.boxfish.cn/login
 
 
 失败   
 失败   
 {
 {
-  "code":"",
+  "code":"fail",
   "msg":"失败具体原因"
   "msg":"失败具体原因"
 }
 }