我怎样才能得到这个手风琴样式显示/隐藏功能的隐藏div高度？

<div class="accordion">
  <div class="accordion-item">
    <div class="accordion-title">标题1</div>
    <div class="accordion-content">内容1</div>
  </div>
  <div class="accordion-item">
    <div class="accordion-title">标题2</div>
    <div class="accordion-content">内容2</div>
  </div>
  ...
</div>

.accordion-content {
  display: none;
}

var accordion = document.querySelector('.accordion');
accordion.addEventListener('click', function(event) {
  var target = event.target;
  if (target.classList.contains('accordion-title')) {
    var content = target.nextElementSibling;
    content.style.display = (content.style.display === 'none') ? 'block' : 'none';
  }
});

var content = document.querySelector('.accordion-content');
var height = content.offsetHeight;
console.log('隐藏div的高度为：' + height + 'px');