优化一些逻辑。

middleware/auth.go

@@ -21,7 +21,7 @@ func JWTAuth() gin.HandlerFunc {
 		}
 
 		parts := strings.SplitN(authHeader, " ", 2)
-		if !(len(parts) == 2 && parts[0] == "Bearer") {
+		if len(parts) != 2 || parts[0] != "Bearer" {
 			c.JSON(http.StatusUnauthorized, gin.H{"error": "认证格式错误"})
 			c.Abort()
 			return