這是我第一次在 Node.js 中創(chuàng)建類，我想知道為什么我不能運(yùn)行這個函數(shù)……有人能給我指出正確的方向嗎？class Customer {  constructor() {    this.shoppingBasket = [];    function startShopping() {      const prompt = require("prompt-sync")();      const itemName = prompt("What item is this?");      const itemPrice = prompt("How much is it?");      const taxExemption = promt("Is this a food, book or medical product?");      console.log(`Your item is ${itemName}`);    }  }}Customer = Customer;Customer.startShopping();