如何让js文件只加载一次

// myModule.js
export const myFunction = () => {
    console.log('This function is from myModule');
};

// main.js
import { myFunction } from './myModule.js';
myFunction();

let moduleLoaded = false;

async function loadModule() {
    if (!moduleLoaded) {
        const module = await import('./myModule.js');
        module.myFunction();
        moduleLoaded = true;
    }
}

loadModule();

// myModule.js
if (!window.myModuleLoaded) {
    window.myModuleLoaded = true;
    // 模块的代码
    console.log('myModule loaded');
}

// main.js
if (!window.myModuleLoaded) {
    const script = document.createElement('script');
    script.src = 'myModule.js';
    document.head.appendChild(script);
}

Cache-Control: public, max-age=31536000

// webpack.config.js
module.exports = {
    // 其他配置...
    output: {
        filename: '[name].[contenthash].js',
        path: __dirname + '/dist'
    }
};