如何知道哪个提交按钮触发了onsubmit事件

function handleSubmit(event) {
  var target = event.target;
  if (target.id === 'submitButton1') {
    // 第一个提交按钮触发了onsubmit事件
  } else if (target.id === 'submitButton2') {
    // 第二个提交按钮触发了onsubmit事件
  }
}

var form = document.getElementById('myForm');
form.addEventListener('submit', handleSubmit);

function handleSubmit(event) {
  var targetId = event.submitter.id;
  if (targetId === 'submitButton1') {
    // 第一个提交按钮触发了onsubmit事件
  } else if (targetId === 'submitButton2') {
    // 第二个提交按钮触发了onsubmit事件
  }
}

var form = document.getElementById('myForm');
form.addEventListener('submit', handleSubmit);

var clickedButton;

function handleButtonClick(event) {
  clickedButton = event.target;
}

function handleSubmit(event) {
  if (clickedButton.id === 'submitButton1') {
    // 第一个提交按钮触发了onsubmit事件
  } else if (clickedButton.id === 'submitButton2') {
    // 第二个提交按钮触发了onsubmit事件
  }
}

var button1 = document.getElementById('submitButton1');
var button2 = document.getElementById('submitButton2');
button1.addEventListener('click', handleButtonClick);
button2.addEventListener('click', handleButtonClick);

var form = document.getElementById('myForm');
form.addEventListener('submit', handleSubmit);