将方法中的值放入属性数组中

Question

const cart = {
  contents: [],
  addItem() {

  }
};
cart.addItem("laptop");
console.log("The cart contains:", cart.contents);

我如何将addItem方法中的项目放入内容属性数组？

Answer 1

您可以这样做this.contents.push(item)

const cart = {
  contents: [],
  addItem(item) {
     this.contents.push(item)
  }
};
cart.addItem("laptop");
console.log("The cart contains:", cart.contents);

Answer 2

使用push：

const cart = {
  contents: [],
  addItem(item) {
    this.contents.push(item);
  }
};
cart.addItem("laptop");
console.log("The cart contains:", cart.contents);

如果要传递addItem("laptop", "phone")之类的多个项目，请使用传播：

const cart = {
  contents: [],
  addItem(...items) {
    this.contents.push(...items);
  }
};
cart.addItem("laptop", "phone");
console.log("The cart contains:", cart.contents);