如何在放置在不同.js文件中的函数之间读取、更新和传递变量？

var globalVariable = "Hello";

console.log(globalVariable); // 输出：Hello
globalVariable = "World";
console.log(globalVariable); // 输出：World

export const moduleVariable = "Hello";

import { moduleVariable } from './module.js';
console.log(moduleVariable); // 输出：Hello

export function updateVariable(variable) {
  return variable + " World";
}

import { updateVariable } from './module.js';
let variable = "Hello";
variable = updateVariable(variable);
console.log(variable); // 输出：Hello World

const event = new CustomEvent('updateVariable', { detail: { variable: "Hello" } });
document.dispatchEvent(event);

document.addEventListener('updateVariable', function(event) {
  const variable = event.detail.variable;
  console.log(variable); // 输出：Hello
});