jQuery背景墙聚光灯效果代码

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引入jQuery

<script src="http://libs.baidu.com/jquery/1.6.4/jquery.min.js"></script>

jQuery插件

 <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>

CSS样式

<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>

HTML

<div class='spotlightWrapper'>
  <ul>
   <li><a href='#'><img src='images/1.jpg' /></a></li>
  </ul>
</div>

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