import { Pipe, PipeTransform } from '@angular/core'; @Pipe({ name: 'displayArea' }) export class DisplayAreaPipe implements PipeTransform { transform(value: any): string { switch (value) { case 1: return '赠券专区'; case 2: return '金币专区'; case 3: return '银联专区'; case 4: return '优选商品'; case 5: return '工会卡专区'; case null: return '消费券'; } } }