如何使用angular 5验证网站地址

npm install -g @angular/cli

ng new website-validation

cd website-validation

ng generate component WebsiteValidation

import { Component } from '@angular/core';
import { FormControl, Validators } from '@angular/forms';

@Component({
  selector: 'app-website-validation',
  template: `
    <form [formGroup]="websiteForm">
      <input type="text" formControlName="websiteUrl" placeholder="请输入网站地址">
      <button (click)="validateWebsite()">验证</button>
      <p *ngIf="websiteUrl.invalid && websiteUrl.dirty">请输入有效的网站地址。</p>
    </form>
  `,
})
export class WebsiteValidationComponent {
  websiteForm = new FormGroup({
    websiteUrl: new FormControl('', Validators.pattern('^https?://.+')),
  });

  get websiteUrl() {
    return this.websiteForm.get('websiteUrl');
  }

  validateWebsite() {
    if (this.websiteForm.valid) {
      // 执行网站地址验证逻辑
      console.log('网站地址验证通过！');
    }
  }
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';

import { AppComponent } from './app.component';
import { WebsiteValidationComponent } from './website-validation.component';

@NgModule({
  declarations: [
    AppComponent,
    WebsiteValidationComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    ReactiveFormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

<h1>网站地址验证</h1>
<app-website-validation></app-website-validation>

ng serve