feat(utils): add isUrl fun

Author: wangxingkang

src/utils/index.ts

@@ -1,5 +1,7 @@
 export * from './is';
 export * from './rect';
 
+/** 空方法 */
+export const noop = () => {};
 export const now = () => Date.now();
 export const timestamp = () => +Date.now();

src/utils/is.ts

@@ -16,9 +16,46 @@ export const isString = (val: unknown): val is string => typeof val === 'string'
 export const isWindow = (val: any): val is Window =>
   typeof window !== 'undefined' && toString.call(val) === '[object Window]';
 
-/** 空方法 */
-export const noop = () => {};
-
 /** 判断是否是IOS系统 */
 export const isIOS =
   isClient && window?.navigator?.userAgent && /iP(ad|hone|od)/.test(window.navigator.userAgent);
+
+const protocolAndDomainRE = /^(?:\w+:)?\/\/(\S+)$/;
+
+const localhostDomainRE = /^localhost[\:?\d]*(?:[^\:?\d]\S*)?$/;
+const nonLocalhostDomainRE = /^[^\s\.]+\.\S{2,}$/;
+
+/**
+ * 检查字符串是否是 url
+ *
+ * @param value 要检查的值
+ * @returns `value` 是 Url 返回 `true`，否则返回 `false`
+ * @example
+ * ```ts
+ * isUrl('https://www.baidu.com') // => true
+ * ```
+ */
+export default function isUrl(value: string) {
+  if (!isString(value)) {
+    return false;
+  }
+
+  const match = value.match(protocolAndDomainRE);
+  if (!match) {
+    return false;
+  }
+
+  const everythingAfterProtocol = match[1];
+  if (!everythingAfterProtocol) {
+    return false;
+  }
+
+  if (
+    localhostDomainRE.test(everythingAfterProtocol) ||
+    nonLocalhostDomainRE.test(everythingAfterProtocol)
+  ) {
+    return true;
+  }
+
+  return false;
+}