js监听判断是否超出省略号显示

function isOverflow(element) {

  return element.scrollWidth > element.offsetWidth;

}

let element = document.querySelector('.ellipsis-span');

let resizeObserver = new ResizeObserver(() => {

  let overflow = isOverflow(element);

  if (overflow) {

    console.log('内容超出，需要显示省略号');

  } else {

    console.log('内容未超出，不需要显示省略号');

  }

});

resizeObserver.observe(element);