我正在使用 envconfig 庫瀏覽一些源代碼，但無法理解以下代碼的作用。我知道它加載環境變量，但想了解每條特定行的作用。我希望有人能向我解釋一下。特別是生產線的作用envconfig.Process("", &Env) package config      import (        "html/template"        "log"        "os"            "github.com/joho/godotenv"        "github.com/kelseyhightower/envconfig"    )        type envVars struct {        Dbhost     string `required:"true" envconfig:"DB_HOST"`        Dbport     string `required:"true" envconfig:"DB_PORT"`        Dbuser     string `required:"true" envconfig:"DB_USER"`        Dbpassword string `required:"true" envconfig:"DB_PASS"`        Dbname     string `required:"true" envconfig:"DB_NAME"`        JwtKey     string `required:"true" envconfig:"JWT_KEY"`        HashKey    string `required:"true" envconfig:"HASH_KEY"`    }        //Env holds application config variables    var Env envVars        // Tpl template    var Tpl *template.Template        func init() {            wd, err := os.Getwd() //get path of working directory(current directory) - directory of this project        if err != nil {            log.Println(err, "::Unable to get paths")        }            Tpl = template.Must(template.ParseGlob(wd + "/internal/views/*.html")) //could use path.join in case it's used on linux instead of windows.                    //load .env file        err = godotenv.Load(wd + "/./.env") //loads environment variable file so that env variables can be accessed in code eg. by using os.GetEnv("DB_DIALECT"), won't work otherwise.            if err != nil {            log.Println("Error loading .env file, falling back to cli passed env")        }            err = envconfig.Process("", &Env)            if err != nil {            log.Fatalln("Error loading environment variables", err)        }        }