jquery实现背景墙聚光灯效果示例分享

代码如下:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
 "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
 <meta http-equiv="Content-type" content="text/html; charset=utf-8">
 <title>jQuery背景墙聚光灯效果代码 </title>
 <script type="text/javascript" charset="utf-8" src='/jquery.js'></script>
 <script type="text/javascript" charset="utf-8">
  $(window).load(function(){
   var spotlight = {
     // the opacity of the "transparent" images - change it if you like
    opacity : 0.2,

/*the vars bellow are for width and height of the images so we can make
    the <li> same size */
    imgWidth : $('.spotlightWrapper ul li').find('img').width(),
    imgHeight : $('.spotlightWrapper ul li').find('img').height()

};

//set the width and height of the list items same as the images
   $('.spotlightWrapper ul li').css({ 'width' : spotlight.imgWidth, 'height' : spotlight.imgHeight });

//when mouse over the list item...
   $('.spotlightWrapper ul li').hover(function(){

//...find the image inside of it and add active class to it and change opacity to 1 (no transparency)
    $(this).find('img').addClass('active').css({ 'opacity' : 1});

//get the other list items and change the opacity of the images inside it to the one we have set in the spotlight array
    $(this).siblings('li').find('img').css({'opacity' : spotlight.opacity}) ;

//when mouse leave...
   }, function(){

//... find the image inside of the list item we just left and remove the active class
    $(this).find('img').removeClass('active');

});

//when mouse leaves the unordered list...
   $('.spotlightWrapper ul').bind('mouseleave',function(){
    //find the images and change the opacity to 1 (fully visible)
    $(this).find('img').css('opacity', 1);
   });

});
 </script>
 <style type="text/css" media="screen">
  body { background:black; color:white; font-family: 'georgia' } /* not important */
  .spotlightWrapper ul {
   list-style-type: none; /* remove the default style for list items (the circles) */
   margin:0px; /* remove default margin */
   padding:0px; /* remove default padding */
  }
  .spotlightWrapper ul li {
   float:left; /* important: left float */
   position:relative; /* so we can use top and left positioning */
  }
  .spotlightWrapper ul li a img {
   width:200px; /* you don't need this, i just rescaled the images they are bigger then i want them to be ' */
   position:relative; /* so we can use top and left positioning */
   border:none; /* remove the default blue border */
  }
  .spotlightWrapper ul li a img.active {
   border:4px solid white; /* choose whatever you like */
   z-index:1; /* show it on top of the other images (they have z-index 0) */
   left: -4px; /* same as border width but negative */
   top: -4px; /* same as border width but negative */
  }
  .clear { clear:both; } /* to clear the float after the last item */
 </style>
</head>
<body>
 <h3>jQuery背景墙聚光灯效果</h3>
    <p>点击图片查看效果</p>
 <!-- start spotlightWrapper div -->
<div class='spotlightWrapper'>
  <!-- start unordered list -->
  <ul>
   <li><a href='#'><img src='images/1.jpg' /></a></li>
   <li><a href='#'><img src='images/2.jpg' /></a></li>
   <li><a href='#'><img src='images/3.png' /></a></li>
   <li><a href='#'><img src='images/4.jpg' /></a></li>
   <li><a href='#'><img src='images/5.jpg' /></a></li>
   <li><a href='#'><img src='images/6.png' /></a></li>
   <li><a href='#'><img src='images/7.jpg' /></a></li>
   <li><a href='#'><img src='images/9.PNG' /></a></li>
   <li><a href='#'><img src='images/10.jpg' /></a></li>
   <li><a href='#'><img src='images/11.png' /></a></li>
   <li><a href='#'><img src='images/12.png' /></a></li>
   <li><a href='#'><img src='images/13.jpg' /></a></li>
   <li><a href='#'><img src='images/14.png' /></a></li>
   <li><a href='#'><img src='images/15.jpg' /></a></li>
   <li><a href='#'><img src='images/16.jpg' /></a></li>
   <div class='clear'></div>
  </ul>
  <!-- end unordered list -->
 </div>
 <!-- end spolightWrapper div -->

</body>
</html>