将鼠标悬停在图像上，显示文本和不透明度更改

<div class="image-container">
  <img src="image.jpg" alt="示例图像">
  <div class="text-overlay">这里是显示的文本</div>
</div>

.image-container {
  position: relative;
  width: 400px;
  height: 300px;
}

.text-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  color: #fff;
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.image-container:hover .text-overlay {
  opacity: 1;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(document).ready(function() {
  $('.image-container').hover(function() {
    // 鼠标进入时的操作
    $(this).find('.text-overlay').text('这里是显示的文本');
  }, function() {
    // 鼠标离开时的操作
    $(this).find('.text-overlay').text('');
  });
});
</script>