如何在 Node.js 中运行函数

Question

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();

Answer 1

按照您在此处制作它的方式，它是一个范围内的功能......这意味着您无法在您尝试访问它的范围内“看到”它。

您需要使其成为“方法”或将其附加到“此”。

// 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();