web前端js实现动态改变焦点图大小

以下就是实现改变焦点图大小功能的步骤：
<style>
.flexslider {
	margin: 0px auto;
	position: relative;
	 100%;
	overflow: hidden;
	zoom: 1;
	max-100%;min-1309px;
	max-height:100%
}
.flexslider .slides li {
	 100%;
	height: 100%;
}
.flex-direction-nav{
	margin-top:-200px;
}
.flex-direction-nav a {
	 70px;
	height: 70px;
	line-height: 99em;
	overflow: hidden;
	margin: -35px 0 0;
	display: block;
	background: url(images/ad_ctr.png) no-repeat;
	position: absolute;
	top: 50%;
	z-index: 10;
	cursor: pointer;
	opacity: 0;
	filter: alpha(opacity=0);
	-webkit-transition: all .3s ease;
	border-radius: 35px;
}
.flex-direction-nav .flex-next {
	background-position: 0 -70px;
	right: 470px;
}
.flex-direction-nav .flex-prev {
	left: 470px;
}
.flexslider:hover .flex-next {
	opacity: 0.8;
	filter: alpha(opacity=25);
}
.flexslider:hover .flex-prev {
	opacity: 0.8;
	filter: alpha(opacity=25);
}
.flexslider:hover .flex-next:hover,
.flexslider:hover .flex-prev:hover {
	opacity: 1;
	filter: alpha(opacity=50);
}

.flexslider .slides a img {
	 100%;
	display: block;
	max-100%;
	height: auto; 
}

.flex-control-nav {
	position: absolute;
	bottom: 60px;left:47%;
	text-align: center;
}
.flex-control-nav li {
	margin: 0 2px;
	display: inline-block;
	zoom: 1;
	*display: inline;
}
.flex-control-paging li a {
	background: url(images/dot.png) no-repeat 0 -16px;
	display: block;
	height: 16px;
	overflow: hidden;
	text-indent: -99em;
	 16px;
	cursor: pointer;
}
.flex-control-paging li a.flex-active,
.flex-control-paging li.active a {
	background-position: 0 0;
}
.flexslider .slides a img {
	 100%;
	display: block;
	height: auto; 
}

</style>
<div id="banner_tabs" class="flexslider">
	<ul class="slides">
		<li>
			<a href="category.php?id=2">
				<img src="images/focus/10.1.jpg" style="max-100%" />
			</a>
		</li>
		<li>
			<a href="zdy1490336173.php">
				<img src="images/focus/JX..jpg" style="max-100%" />
			</a>
		</li>
	</ul>
	<ul class="flex-direction-nav">
		<li>
			<a class="flex-prev" href="javascript:;">Previous</a> 
		</li>
		<li>
			<a class="flex-next" href="javascript:;">Next</a> 
		</li>
	</ul>
	<ol id="bannerCtrl" class="flex-control-nav flex-control-paging">
		<li>
			<a>1</a> 
		</li>
		<li>
			<a>2</a> 
		</li>
	</ol>
</div>
<script src="/js/slider.js"></script>
<script type="text/javascript">
$(function() {
	/*焦点图start*/
	var bannerSlider = new Slider($('#banner_tabs'), {
		time: 5000,
		delay: 400,
		event: 'hover',
		auto: true,
		mode: 'fade',
		controller: $('#bannerCtrl'),
		activeControllerCls: 'active'
	});
	$('#banner_tabs .flex-prev').click(function() {
		bannerSlider.prev()
	});
	$('#banner_tabs .flex-next').click(function() {
		bannerSlider.next()
	});
　　　　/*焦点图end*/
　　　　/*改这宽度start*/
	var winWidth = 0;  
	var winHeight = 0;  
	function findDimensions() { //函数：获取尺寸  
		//获取窗口宽度  
		if (window.innerWidth) {  
			winWidth = window.innerWidth;  
		}  
		else if ((document.body) && (document.body.clientWidth)) {  
			winWidth = document.body.clientWidth;  
		}  
		//获取窗口高度  
		if (window.innerHeight) {  
			winHeight = window.innerHeight;  
		}  
		else if ((document.body) && (document.body.clientHeight)) {  
			winHeight = document.body.clientHeight;  
		}  
		//通过深入Document内部对body进行检测，获取窗口大小  
		if (document.documentElement && document.documentElement.clientHeight && document.documentElement.clientWidth) {  
			winHeight = document.documentElement.clientHeight-173; //这里是根据当前需要改变的值 
			winWidth = document.documentElement.clientWidth;  
		}              
		//设置div的具体宽度=窗口的宽度的%  
		if (document.getElementById("banner_tabs")) {  
			document.getElementById("banner_tabs").style.height = winHeight + "px";  
		}  
	}  
	findDimensions();  
	window.onresize = findDimensions;
　　　　/*改这宽度end*/
});
</script>

slider.js
/**
 * slider插件可悬停控制
 */
; $(function ($, window, document, undefined) {
    
    Slider = function (container, options) {
        /*
        options = {
            auto: true,
            time: 3000,
            event: 'hover' | 'click',
            mode: 'slide | fade',
            controller: $(),
            activeControllerCls: 'className',
            exchangeEnd: $.noop
        }
        */

        "use strict"; //stirct mode not support by IE9-

        if (!container) return;

        var options = options || {},
            currentIndex = 0,
            cls = options.activeControllerCls,
            delay = options.delay,
            isAuto = options.auto,
            controller = options.controller,
            event = options.event,
            interval,
            slidesWrapper = container.children().first(),
            slides = slidesWrapper.children(),
            length = slides.length,
            childWidth = container.width(),
            totalWidth = childWidth * slides.length;

        function init() {
            var controlItem = controller.children();

            mode();

            event == 'hover' ? controlItem.mouseover(function () {
                stop();
                var index = $(this).index();

                play(index, options.mode);
            }).mouseout(function () {
                isAuto && autoPlay();
            }) : controlItem.click(function () {
                stop();
                var index = $(this).index();

                play(index, options.mode);
                isAuto && autoPlay();
            });

            isAuto && autoPlay();
        }

        //animate mode
        function mode() {
            var wrapper = container.children().first();

            options.mode == 'slide_one' ? wrapper.width(totalWidth) : wrapper.children().css({
                'position': 'absolute',
                'left': 0,
                'top': 0
            })
                .first().siblings().hide();
        }

        //auto play
        function autoPlay() {
            interval = setInterval(function () {
                triggerPlay(currentIndex);
            }, options.time);
        }

        //trigger play
        function triggerPlay(cIndex) {
            var index;

            (cIndex == length - 1) ? index = 0 : index = cIndex + 1;
            play(index, options.mode);
        }

        //play
        function play(index, mode) {
            slidesWrapper.stop(true, true);
            slides.stop(true, true);

            mode == 'slide_one' ? (function () {
                if (index > currentIndex) {
                    slidesWrapper.animate({
                        left: '-=' + Math.abs(index - currentIndex) * childWidth + 'px'
                    }, delay);
                } else if (index < currentIndex) {
                    slidesWrapper.animate({
                        left: '+=' + Math.abs(index - currentIndex) * childWidth + 'px'
                    }, delay);
                } else {
                    return;
                }
            })() : (function () {
                if (slidesWrapper.children(':visible').index() == index) return;
                slidesWrapper.children().fadeOut(delay).eq(index).fadeIn(delay);
            })();

            try {
                controller.children('.' + cls).removeClass(cls);
                controller.children().eq(index).addClass(cls);
            } catch (e) { }

            currentIndex = index;

            options.exchangeEnd && typeof options.exchangeEnd == 'function' && options.exchangeEnd.call(this, currentIndex);
        }

        //stop
        function stop() {
            clearInterval(interval);
        }

        //prev frame
        function prev() {
            stop();

            currentIndex == 0 ? triggerPlay(length - 2) : triggerPlay(currentIndex - 2);

            isAuto && autoPlay();
        }

        //next frame
        function next() {
            stop();

            currentIndex == length - 1 ? triggerPlay(-1) : triggerPlay(currentIndex);

            isAuto && autoPlay();
        }

        //init
        init();

        //expose the Slider API
        return {
            prev: function () {
                prev();
            },
            next: function () {
                next();
            }
        }
    };

}(jQuery, window, document));

写的比较简陋，如有错的地方，可以联系我哦