// 配置 CORS
r.Use(cors.New(cors.Config{
    AllowOrigins:     []string{"*"}, // 允許所有來源（生產(chǎn)環(huán)境建議改成前端域名如http://localhost:8080）
    AllowMethods:     []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
    AllowHeaders:     []string{"Origin", "Content-Type", "Authorization"},
    ExposeHeaders:    []string{"Content-Length"},
    AllowCredentials: true,
    MaxAge:           12 * time.Hour,
}))

如