向鼠标方向发射字符

<div id="container">
  <span id="text">Hello World!</span>
</div>

#container {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

#text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 24px;
  color: #000;
}

var container = document.getElementById('container');
var text = document.getElementById('text');

container.addEventListener('mousemove', function(event) {
  var mouseX = event.clientX;
  var mouseY = event.clientY;

  var containerWidth = container.offsetWidth;
  var containerHeight = container.offsetHeight;

  var textWidth = text.offsetWidth;
  var textHeight = text.offsetHeight;

  var posX = (mouseX / containerWidth) * (containerWidth - textWidth);
  var posY = (mouseY / containerHeight) * (containerHeight - textHeight);

  text.style.transform = 'translate(' + posX + 'px, ' + posY + 'px)';
});