使用类型而不是值：

func getEncFields(t reflect.Type, list map[string]int) {
    // Dereference pointer types.
    for t.Kind() == reflect.Ptr {
        t = t.Elem()
    }
    // Look for tags in struct fields.
    if t.Kind() == reflect.Struct {
        for i := 0; i < t.NumField(); i++ {
            field := t.Field(i)
            tag := field.Tag.Get("bson")
            if containsTag(tag, "encr") {
                list[getFieldName(field, tag)]++
            }
            getEncFields(field.Type, list)
        }
    }
}

以下是如何调用它：

listOfEncTags := make(map[string]int)
getEncFields(reflect.TypeOf(Gadget{}), listOfEncTags)
fmt.Println(listOfEncTags)

https://go.dev/play/p/5JsOil-P-RH