在ng中仅显示一个值-如果有相同的数据出现，则显示

<div *ngFor="let item of items | unique">
  {{ item }}
</div>

items: string[] = ['apple', 'banana', 'apple', 'orange', 'banana'];

import { UniquePipe } from './unique.pipe';

@NgModule({
  declarations: [
    UniquePipe
  ],
  // 其他模块配置...
})
export class AppModule { }

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'unique'
})
export class UniquePipe implements PipeTransform {
  transform(value: any[]): any[] {
    return Array.from(new Set(value));
  }
}