Javascript 如何在Node.js中运行函数

这是我第一次在Node.js中创建类，我想知道为什么我不能运行这个函数。。。。有人能给我指出正确的方向吗

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();

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这是一个范围函数，就像你在这里做的那样。。。这意味着您无法在试图访问它的范围内看到它

您需要使其成为一个方法，或者将其附加到此方法

// We normally require/import things at the top, but not nessesarily.
// const PromptSync = require("prompt-sync");

class Customer {
  constructor() {
    this.shoppingBasket = [];


    this.startShoppingPropertyFunction = () => {
      // If imported at top, use this instead:
      // const prompt = new PromptSync();
      const prompt = require("prompt-sync")();
      const itemName = prompt("What item is this?");
      const itemPrice = prompt("How much is it?");
      const taxExemption = prompt("Is this a food, book or medical product?");
      console.log(`Your item is ${itemName}`);
    }
  }

  startShoppingMethod() {
    // If imported at top, use this instead:
    // const prompt = new PromptSync();
    const prompt = require("prompt-sync")();
    const itemName = prompt("What item is this?");
    const itemPrice = prompt("How much is it?");
    const taxExemption = prompt("Is this a food, book or medical product?");
    console.log(`Your item is ${itemName}`);
  }
}

const myCustomer = new Customer();
myCustomer.startShoppingMethod();
myCustomer.startShoppingPropertyFunction();

startShopping是构造函数中的一个免费函数-您必须将其移出；应该是让客户=新客户；并将函数从构造函数移动到类BodyCustomer，因为Customer没有属性startShopping。该函数仅在构造函数内部可见。但是你的代码还有很多奇怪的地方。我建议首先阅读更多关于课程的内容：