定时器-通过文件依赖了解任务排序

<script>
    function load(src, callback) {
     
      let script = document.createElement('script')
      script.src = src
      script.onload = callback
      document.body.appendChild(script)
    }
    //任务队列是先进先执行
    load('hd.js', () => {
     
      hd()
      load('houdunren.js', () => {
     
        houdunren() //依赖hd.js
      })
    })
    console.log('主线程代码全部执行完后再来轮询任务队列'); 
  </script>