判断golang中解析的json响应中是否存在所需的json键(不是值)

这里我需要判断p.Email是否存在，如果存在，则指定EMAIL值，如果不指定空字符串

Email string"email"Email

nullEmail *stringifnil

当您需要区分未定义/空/空时，请使用下面答案中建议的自定义反编组拆收器:

type String struct {
    IsDefined bool
    Value     string
}

// This method will be automatically invoked by json.Unmarshal
// but only for values that were provided in the json, regardless
// of whether they were null or not.
func (s *String) UnmarshalJSON(d []byte) error {
    s.IsDefined = true
    if string(d) != "null" {
        return json.Unmarshal(d, &s.Value)
    }
    return nil
}

StringstringIsDefined