jQuery实现图片预加载效果

<div class="main">
 <br>
 <div class="title">图片预加载</div>
 <div class="content">
  <div class="img">
  <a href="">
   <img lazyloadsrc="images/1.jpg" alt="" width="200" height="120">
  </a>
  <span class="loading"></span>
  </div>
  <div class="img">
  <a href="">
   <img lazyloadsrc="images/2.jpg" alt="" width="200" height="120">
  </a>
  <span class="loading"></span>
  </div>
  <div class="img">
  <a href="">
   <img lazyloadsrc="images/3.jpg" alt="" width="200" height="120">
  </a>
  <span class="loading"></span>
  </div>
  <div class="img">
  <a href="">
   <img lazyloadsrc="images/4.jpg" alt="" width="200" height="120">
  </a>
  <span class="loading"></span>
  </div>
  <div class="img">
  <a href="">
   <img lazyloadsrc="images/5.jpg" alt="" width="200" height="120">
  </a>
  <span class="loading"></span>
  </div>
  <div class="img">
  <a href="">
   <img lazyloadsrc="images/6.jpg" alt="" width="200" height="120">
  </a>
  <span class="loading"></span>
  </div>
 </div>
 </div>

 $(function () {
  $("[lazyLoadSrc]").YdxLazyLoad({
  onShow: function () {
   $(this).parent().next().hide()
  }
  });
 });