fix

 const CaptchaApi = require('./captcha-api');
 const CaptchaApi = require('./captcha-api');
 const logger = global.yoho.logger;
 const logger = global.yoho.logger;
+const config = global.yoho.config;
 
 
 module.exports = class extends global.yoho.BaseModel {
 module.exports = class extends global.yoho.BaseModel {
     constructor(ctx) {
     constructor(ctx) {
@@ -16,28 +17,36 @@ module.exports = class extends global.yoho.BaseModel {
             });
             });
     }
     }
 
 
+    _checkUniverse(captcha) {
+        return captcha === config.UNIVERSAL_CAPTCHA ?
+            Promise.resolve({code: 200}) :
+            Promise.reject();
+    }
+
     check(id, captcha) {
     check(id, captcha) {
-        return this.api.check(id, captcha).then((result) => {
-            if (result.code === 200) {
-                return {
-                    code: 200,
-                    message: '验证成功'
-                };
-            } else if (result.code === 503 || result.code === 504 || result.code === 501) {
-                return {
-                    code: 403,
-                    message: result.message
-                };
-            } else {
-                return {
-                    code: 405,
-                    message: result.message,
-                    data: {
-                        needCaptcha: true
-                    }
-                };
-            }
-        });
+        return this._checkUniverse(captcha)
+            .catch(() => this.api.check(id, captcha))
+            .then((result) => {
+                if (result.code === 200) {
+                    return {
+                        code: 200,
+                        message: '验证成功'
+                    };
+                } else if (result.code === 503 || result.code === 504 || result.code === 501) {
+                    return {
+                        code: 403,
+                        message: result.message
+                    };
+                } else {
+                    return {
+                        code: 405,
+                        message: result.message,
+                        data: {
+                            needCaptcha: true
+                        }
+                    };
+                }
+            });
     }
     }
 
 
 
 

@@ -136,6 +136,7 @@ module.exports = {
         id: '356b333091cdb78cd788e7bdd5f05c9f',
         id: '356b333091cdb78cd788e7bdd5f05c9f',
         key: '6fef8ee77e41429de68455eeb052ce37'
         key: '6fef8ee77e41429de68455eeb052ce37'
     },
     },
+    UNIVERSAL_CAPTCHA: 'yoho4946abcdef#$%&!@',
     apiCache: {
     apiCache: {
         cache: false
         cache: false
     },
     },