JQuery -幻灯片重叠

<div id="slideshow">
  <div class="slide">Slide 1</div>
  <div class="slide">Slide 2</div>
  <div class="slide">Slide 3</div>
</div>

#slideshow {
  position: relative;
  width: 400px;
  height: 200px;
  overflow: hidden;
}

.slide {
  position: absolute;
  width: 100%;
  height: 100%;
  display: none;
}

.slide:first-child {
  display: block;
}

$(document).ready(function() {
  setInterval(function() {
    $('#slideshow .slide:first-child').fadeOut(1000).next('.slide').fadeIn(1000).end().appendTo('#slideshow');
  }, 3000);
});