2BTV-Web/src/util/ShopCartState.js

import APIClient from './API/APIClient';

let cartCount = 0;

function updateDOMs() {
  let updateDoms = document.getElementsByClassName('cart-num');
  for (let i = 0; i < updateDoms.length; i++) {
    updateDoms[i].style.display = cartCount > 0 ? 'block' : 'none';
    updateDoms[i].innerHTML = cartCount;
  }
}

class ShopCartState {
    constructor() { }

    static updateCount() {
        APIClient.getShopCartCount((isTrue, res) => {
            cartCount = res.data.totalNum;
            updateDOMs();
        })
    }

    static test() {
        cartCount = 99;
        updateDOMs();
    }

    static getCount() {
        // return cartCount;
        updateDOMs();
    }

    static setCartCount(number){
        cartCount = number;
        updateDOMs();
    }
}

export default ShopCartState;