go - 是否可以为空接口(interface)键入别名，然后向该别名添加函数？

Question

在 Go 中，是否可以在空接口(interface)中键入别名，然后向该别名添加函数？
我想做类似的事情:

type DbJSON interface{}
func (src *DbJSON) Value() (driver.Value, error) {
    return json.Marshal(src)
}

Answer 1

不，你不能这样做。方法实现属于具体类型。该规范禁止在接口(interface)上声明方法或指向接口(interface)和指针类型的指针。
Spec: Method declaration:

The receiver is specified via an extra parameter section preceding the method name. That parameter section must declare a single non-variadic parameter, the receiver. Its type must be a defined type T or a pointer to a defined type T. T is called the receiver base type. A receiver base type cannot be a pointer or interface type and it must be defined in the same package as the method.