html - 是否存在类似 number 的内容？

Question

当我们使用

<a href="tel:number">number</a> or <a href="mailto:mailid">mailid</a>

对于电话号码和电子邮件，执行类似 <a href="fax:number">number</a> 的操作传真存在吗？

Answer 1

是的，https://www.ietf.org/rfc/rfc2806 中讨论了电话、传真和调制解调器 URL 方案

2.3“传真”URL方案

The URL syntax is formally described as follows (the definition reuses nonterminals from the above definition). For the basis of this syntax, see [RFC2303] and [RFC2304].

  fax-url          = fax-scheme ":" fax-subscriber
  fax-scheme       = "fax"
  fax-subscriber   = fax-global-phone / fax-local-phone
  fax-global-phone = "+" base-phone-number [isdn-subaddress]
                     [t33-subaddress] [post-dial]
                     *(area-specifier / service-provider /
                     future-extension)
  fax-local-phone  = 1*(phonedigit / dtmf-digit /
                     pause-character) [isdn-subaddress]
                     [t33-subaddress] [post-dial]
                     area-specifier
                     *(area-specifier / service-provider /
                     future-extension)
  t33-subaddress   = ";tsub=" 1*phonedigit

The fax: URL is very similar to the tel: URL. The main difference is that in addition to ISDN subaddresses, telefaxes also have an another type of subaddress, see section 2.5.8.

示例:

<a href="fax:+358.555.1234567">+358.555.1234567</a>

但是，根据下面的评论，RFC 2806 was obsoleted by RFC 3966 and you should just use the tel URI scheme:

The "tel" URI does not specify the call type, such as voice, fax, or data call, and does not provide the connection parameters for a data call. The type and parameters are assumed to be negotiated either in-band by the telephone device or through a signaling protocol such as SIP. This document obsoletes RFC 2806.

RFC 3966 was updated by RFC 5341 形式化 URI 参数并要求它们是 registered with IANA 。为了完整起见，我将这些包括在这里。它们不包含有关传真设备的任何其他信息。