如何在angular 4中获取表列表/网格中的GrandTotal？

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';

export class YourComponent implements OnInit {
  tableData: any[]; // 存储表列表/网格的数据
  grandTotal: number; // 存储GrandTotal
  // ...
}

export class YourComponent implements OnInit {
  // ...
  
  constructor(private http: HttpClient) { }
  
  ngOnInit() {
    this.http.get<any[]>('your-api-url').subscribe(data => {
      this.tableData = data;
      this.calculateGrandTotal();
    });
  }
  
  calculateGrandTotal() {
    this.grandTotal = 0;
    for (let item of this.tableData) {
      this.grandTotal += item.value;
    }
  }
}

<table>
  <thead>
    <tr>
      <th>Column 1</th>
      <th>Column 2</th>
      <!-- ... -->
    </tr>
  </thead>
  <tbody>
    <tr *ngFor="let item of tableData">
      <td>{{ item.column1 }}</td>
      <td>{{ item.column2 }}</td>
      <!-- ... -->
    </tr>
  </tbody>
</table>

<div>Grand Total: {{ grandTotal }}</div>