feat: 网站favicon获取

src/utils/url.ts

@@ -0,0 +1,14 @@
+export function isUrl(str: string): boolean {  
+  // const urlPattern = new RegExp(  
+  //   '^(https?:\\/\\/)?'+ // protocol  
+  //   '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name and extension  
+  //   '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address  
+  //   '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path  
+  //   '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string  
+  //   '(\\#[-a-z\\d_]*)?$','i'); // fragment locator  
+  // return urlPattern.test(str);  
+  const urlPattern = new RegExp(  
+    '^(https?:\\/\\/)?'+ // protocol  
+    '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,})','i'); // fragment locator  
+  return urlPattern.test(str);  
+}