初始化

node_modules/axios/lib/helpers/isAbsoluteURL.js

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+'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
+ */
+export default 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);
+}