这次我们要分享的这款jQuery焦点图非常特别，它的外观特别简单，但是又相当大气。焦点图的整体样式是仿苹果样式的，由于jQuery的运用，我们只要点击图片下方的缩略图即可达到图片切换的焦点图特效，这款jQuery焦点图插件非常适合在产片展示的网页上使用。

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接下来我们一起分享一下实现这款苹果焦点图的过程及源码。

HTML代码：

<div id="gallery">

    <div id="slides" style="width: 3680px; margin-left: 0px;">

    <div class="slide"><img width="920" height="400" alt="side" src="img/sample_slides/macbook.jpg"></div>
    <div class="slide"><img width="920" height="400" alt="side" src="img/sample_slides/iphone.jpg"></div>
    <div class="slide"><img width="920" height="400" alt="side" src="img/sample_slides/imac.jpg"></div>
    <div class="slide"><a target="_blank" href="http://tutorialzine.com/2009/10/beautiful-apple-gallery-slideshow/"><img width="920" height="400" alt="side" src="img/sample_slides/info.jpg"></a></div>

    </div>

    <div id="menu">

    <ul>
        <li class="fbar inact"> </li><li class="menuItem inact act"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_macbook.png"></a></li><li class="menuItem inact"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_iphone.png"></a></li><li class="menuItem inact"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_imac.png"></a></li><li class="menuItem inact"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_about.png"></a></li>
    </ul>

    </div>

  </div>

从以上HTML代码可以看出，整个焦点图由一些div构成图片容器，用ul li列表构成下面的缩略图。

CSS代码：

#gallery{
	/* CSS3 Box Shadow */
	-moz-box-shadow:0 0 3px #AAAAAA;
	-webkit-box-shadow:0 0 3px #AAAAAA;
	box-shadow:0 0 3px #AAAAAA;

	/* CSS3 Rounded Corners */

	-moz-border-radius-bottomleft:4px;
	-webkit-border-bottom-left-radius:4px;
	border-bottom-left-radius:4px;

	-moz-border-radius-bottomright:4px;
	-webkit-border-bottom-right-radius:4px;
	border-bottom-right-radius:4px;

	border:1px solid white;

	background:url(img/panel.jpg) repeat-x bottom center #ffffff;

	/* The width of the gallery */
	width:920px;
	overflow:hidden;
}

#slides{
	/* This is the slide area */
	height:400px;

	/* jQuery changes the width later on to the sum of the widths of all the slides. */
	width:920px;
	overflow:hidden;
}

.slide{
	float:left;
}

#menu{
	/* This is the container for the thumbnails */
	height:45px;
}

ul{
	margin:0px;
	padding:0px;
}

li{
	/* Every thumbnail is a li element */
	width:60px;
	display:inline-block;
	list-style:none;
	height:45px;
	overflow:hidden;
}

li.inact:hover{
	/* The inactive state, highlighted on mouse over */
	background:url(img/pic_bg.png) repeat;
}

li.act,li.act:hover{
	/* The active state of the thumb */
	background:url(img/active_bg.png) no-repeat;
}

li.act a{
	cursor:default;
}

.fbar{
	/* The left-most vertical bar, next to the first thumbnail */
	width:2px;
	background:url(img/divider.png) no-repeat right;
}

li a{
	display:block;
	background:url(img/divider.png) no-repeat right;
	height:35px;
	padding-top:10px;
}

a img{
	border:none;
}

CSS代码也非常简单，都是一些简单设置而已。

jQuery代码：

$(document).ready(function(){
	/* This code is executed after the DOM has been completely loaded */

	var totWidth=0;
	var positions = new Array();

	$('#slides .slide').each(function(i){

		/* Traverse through all the slides and store their accumulative widths in totWidth */

		positions[i]= totWidth;
		totWidth += $(this).width();

		/* The positions array contains each slide's commulutative offset from the left part of the container */

		if(!$(this).width())
		{
			alert("Please, fill in width & height for all your images!");
			return false;
		}

	});

	$('#slides').width(totWidth);

	/* Change the cotnainer div's width to the exact width of all the slides combined */

	$('#menu ul li a').click(function(e,keepScroll){

			/* On a thumbnail click */

			$('li.menuItem').removeClass('act').addClass('inact');
			$(this).parent().addClass('act');

			var pos = $(this).parent().prevAll('.menuItem').length;

			$('#slides').stop().animate({marginLeft:-positions[pos]+'px'},450);
			/* Start the sliding animation */

			e.preventDefault();
			/* Prevent the default action of the link */

			// Stopping the auto-advance if an icon has been clicked:
			if(!keepScroll) clearInterval(itvl);
	});

	$('#menu ul li.menuItem:first').addClass('act').siblings().addClass('inact');
	/* On page load, mark the first thumbnail as active */

	/*****
	 *
	 *	Enabling auto-advance.
	 *
	 ****/

	var current=1;
	function autoAdvance()
	{
		if(current==-1) return false;

		$('#menu ul li a').eq(current%$('#menu ul li a').length).trigger('click',[true]);	// [true] will be passed as the keepScroll parameter of the click function on line 28
		current++;
	}

	// The number of seconds that the slider will auto-advance in:

	var changeEvery = 10;

	var itvl = setInterval(function(){autoAdvance()},changeEvery*1000);

	/* End of customizations */
});

这是焦点图的重点，完成了图片滑块的动画逻辑，点击缩略图即可切换图片。

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