Question

我正在写一个ShoppingCart类来添加和删除购物车中的商品代码用于添加和删除购物车中的商品。

class ShoppingCart{
  constructor(){
    this.total = 0;
    this.items = {};
  }

  addItems(itemName, quantity, price){
    this.itemName = itemName;
    this.quantity = quantity;
    this.price = price;
    this.cost = this.quantity * this.price;

    this.total += this.cost;

    this.items['itemName'] = this.itemName;
    this.items['quantity'] = this.quantity;
  }

  removeItems(itemName, quantity, price){
    this.itemName = itemName;
    this.quantity = quantity;
    this.price = price;
    this.cost = this.quantity * this.price;

    this.total -= this.cost;
    delete this.items['itemName', 'quantity'];
  }
}

Answer 1

基本上你需要如何添加和删除列表项。

按照以下方法，让我知道它是否适合您。

<ul id="todo"></ul>
<button onclick="addItemTodo('test')">Add</button>

JS

function addItemTodo(text) {
list = document.getElementById("todo");

item = document.createElement('li');
item.innerText = text;

trash = document.createElement('button');
trash.classList.add('btn1');
trash.addEventListener("click", removeActivity);

icon_trash = document.createElement('i');
icon_trash.classList.add('fas', 'fa-trash-alt', 'fa-2x');
item.appendChild(trash);
trash.appendChild(icon_trash);

list.appendChild(item); }
 function removeActivity() {
var listItems = document.getElementsByTagName("li");
for (var i = 0; i < listItems.length; i++) {
    listItems[i].onclick = function() {
        this.parentNode.removeChild(this);
    }
  }
  }

Live demo

如何在javascript中向对象添加多个项目

1 个答案: