特别计划

¥Special schemes

WHATWG URL 标准 认为少数 URL 协议方案在解析和序列化方面是特殊的。当使用这些特殊协议之一解析网址时，url.protocol 属性可能会更改为另一种特殊协议，但不能更改为非特殊协议，反之亦然。

¥The WHATWG URL Standard considers a handful of URL protocol schemes to be special in terms of how they are parsed and serialized. When a URL is parsed using one of these special protocols, the url.protocol property may be changed to another special protocol but cannot be changed to a non-special protocol, and vice versa.

例如，从 http 更改为 https 有效：

¥For instance, changing from http to https works:

const u = new URL('http://example.org');
u.protocol = 'https';
console.log(u.href);
// https://example.org/ 拷贝

但是，从 http 更改为假设的 fish 协议并不是因为新协议并不特殊。

¥However, changing from http to a hypothetical fish protocol does not because the new protocol is not special.

const u = new URL('http://example.org');
u.protocol = 'fish';
console.log(u.href);
// http://example.org/ 拷贝

同样，也不允许从非特殊协议更改为特殊协议：

¥Likewise, changing from a non-special protocol to a special protocol is also not permitted:

const u = new URL('fish://example.org');
u.protocol = 'http';
console.log(u.href);
// fish://example.org 拷贝

根据 WHATWG 网址标准，特殊协议方案有 ftp、file、http、https、ws 和 wss。

¥According to the WHATWG URL Standard, special protocol schemes are ftp, file, http, https, ws, and wss.