js代码

<script src="js/TweenMax.min.js"></script>
<script>
const letterWrapClass = 'letter-wrap';
const letterWrapElements = document.getElementsByClassName(letterWrapClass);

[...letterWrapElements].forEach(el => {
  letterWrap(el, letterWrapClass);
  letterAnimation(el, letterWrapClass);
});



function letterWrap(el, cls) {
  const words = el.textContent.split(' ');
  const letters = [];
  
  cls = cls || 'letter-wrap'
  
  words.forEach(word => {
    let html = '';
    for (var letter in word) {
      html += `
        <span class="${cls}__char">
          <span class="${cls}__char-inner" data-letter="${word[letter]}">
            ${word[letter]}
          </span>
        </span>
      `;
    };
    
    let wrappedWords = `<span class="${cls}__word">${html}</span>`;
    letters.push(wrappedWords);
  });
  
  return el.innerHTML = letters.join(' ');
}

function letterAnimation(el, cls) {
  const tl = new TimelineMax({ paused: true });
  const characters = el.querySelectorAll(`.${cls}__char-inner`);
  const duration = el.hasAttribute('data-duration') ? el.dataset.duration : 0.3;
  const stagger = el.hasAttribute('data-stagger') ? el.dataset.stagger : 0.03;
  
  el.animation = tl.staggerTo(characters, duration, {
    y: '-100%',
    ease: Power4.easeOut
  }, stagger);
      
  el.addEventListener('mouseenter', (event) => event.currentTarget.animation.play());
  el.addEventListener('mouseout', (event) => el.animation.reverse());
}</script>