用于检查一个变量是否为空，支持指针类型

IsEmpty.go

func IsEmpty(v interface{}) bool {
	rt := reflect.TypeOf(v)

	if rt.Kind() == reflect.Ptr {
		rt = rt.Elem()
		return reflect.DeepEqual(v, reflect.New(rt).Interface())
	}

	return reflect.DeepEqual(v, reflect.Zero(rt).Interface())
}