页面加载后如何加载多个脚本？

<script src="script1.js"></script>
<script src="script2.js"></script>
<script>
    // 内联脚本代码
    // ...
</script>

window.addEventListener('load', function() {
    var script1 = document.createElement('script');
    script1.src = 'script1.js';
    document.head.appendChild(script1);

    var script2 = document.createElement('script');
    script2.src = 'script2.js';
    document.head.appendChild(script2);

    // 动态创建的<script>标签也可以直接在内部编写脚本代码
    var script3 = document.createElement('script');
    script3.textContent = 'console.log("Hello, World!");';
    document.head.appendChild(script3);
});

<script src="script1.js" async></script>
<script src="script2.js" async></script>