for-async-await.js

async function loop() {
  for (let i = 0; i < 10; i++) {
    document.body.innerHTML += i + "  ";
    await waitForEvent();
  }
}

function waitForEvent() {
  return new Promise(resolve => {
    window.onclick = () => {
      console.log("clicked");
      resolve();
    };
  });
}

loop();