所以這是我第一次嘗試使用 React。我必須計算預訂的（總）價格。保留價格由以下幾個因素決定：船長：每米 1.25 歐元人數：每人1歐元電費：每天 1.25 歐元假設船長 10 米，船上有 2 個人用電。他們待了 2 天。計算如下：船長 (10) * 1.25 * 2 = 25人數（2）* 1 * 2 = 4使用電力（真）= 1.25 * 2 = 2.5總價 = 25 歐元 + 4 歐元 + 2.5 歐元 = 21.5 歐元我嘗試在我的代碼中實現它，它看起來像這樣：import React, { Component } from 'react'import BoatForm from "./BoatForm";import StayForm from "./StayForm";export default class PriceCalculator extends Component {    /**     * So, we created a form for the customers so that they can register their boat.     * Now we want to let them know how much their reservation costs.     * The size of the boat, amount of people, amount of days and use of electricity are all parameters.     */    constructor(props) {        super(props)        this.state = {            boat_length: '',            amount_of_people: '',            arrival_date: '',            leave_date: '',            use_of_electricity: '',            box_number: ''        }    }    /**     * We use date fields in our form to define the stay date of the customer.     * That means we have to calculate the days ourselves.     */    calculateStayTime() {        const ArrivalDate = new Date(this.state.arrival_date);        const LeaveDate = new Date(this.state.leave_date);        // calculate difference        const DiffTime = Math.abs(LeaveDate - ArrivalDate);        const DiffDays = Math.ceil(DiffTime / (1000 * 60 * 60 * 24));        let AmountOfDays = DiffDays;        return AmountOfDays;       }}我努力將變量從 calculateStayTime() 傳遞到 calculatePrice()。任何人都可以幫助我如何將我的計算公式化為 React.JS？