15 lines
563 B
JavaScript
15 lines
563 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Determines whether the specified URL is absolute
|
||
|
|
*
|
||
|
|
* @param {string} url The URL to test
|
||
|
|
* @returns {boolean} True if the specified URL is absolute, otherwise false
|
||
|
|
*/
|
||
|
|
module.exports = function isAbsoluteURL(url) {
|
||
|
|
// A URL is considered absolute if it begins with "<scheme>://" or "//" (protocol-relative URL).
|
||
|
|
// RFC 3986 defines scheme name as a sequence of characters beginning with a letter and followed
|
||
|
|
// by any combination of letters, digits, plus, period, or hyphen.
|
||
|
|
return /^([a-z][a-z\d\+\-\.]*:)?\/\//i.test(url);
|
||
|
|
};
|