使用angular 6获取对象数组的百分比

import { Injectable } from '@angular/core';

@Injectable()
export class DataService {
  getObjectArrayPercentage(objectArray: any[], key: string): number {
    const total = objectArray.length;
    const count = objectArray.filter(obj => obj[key]).length;
    return (count / total) * 100;
  }
}

import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-root',
  template: `
    <h1>Object Array Percentage: {{ percentage }}</h1>
  `,
})
export class AppComponent {
  percentage: number;

  constructor(private dataService: DataService) {}

  ngOnInit() {
    const objectArray = [
      { name: 'Object 1', active: true },
      { name: 'Object 2', active: true },
      { name: 'Object 3', active: false },
      { name: 'Object 4', active: true },
    ];
    this.percentage = this.dataService.getObjectArrayPercentage(objectArray, 'active');
  }
}