JQuery仿最新淘宝网首页带箭头幻灯片,JQuery轮播图

JQuery代码
<script type="text/javascript"> 
    $(function() { 
        var $banner = $('.banner'); 
        var $banner_ul = $('.banner-img'); 
        var $btn = $('.banner-btn'); 
        var $btn_a = $btn.find('a') var v_width = $banner.width(); 
   
        var page = 1; 
   
        var timer = null; 
        var btnClass = null; 
   
        var page_count = $banner_ul.find('li').length; //把这个值赋给小圆点的个数 
        var banner_cir = "<li class='selected' href='#'><a></a></li>"; 
        for (var i = 1; i < page_count; i++) { 
            //动态添加小圆点 
            banner_cir += "<li><a href='#'></a></li>"; 
        } 
        $('.banner-circle').append(banner_cir); 
   
        var cirLeft = $('.banner-circle').width() * ( - 0.5); 
        $('.banner-circle').css({ 
            'marginLeft': cirLeft 
        }); 
   
        $banner_ul.width(page_count * v_width); 
   
        function move(obj, classname) { 
            //手动及自动播放 
            if (!$banner_ul.is(':animated')) { 
                if (classname == 'prevBtn') { 
                    if (page == 1) { 
                        $banner_ul.animate({ 
                            left: -v_width * (page_count - 1) 
                        }); 
                        page = page_count; 
                        cirMove(); 
                    } else { 
                        $banner_ul.animate({ 
                            left: '+=' + v_width 
                        }, 
                        "slow"); 
                        page--; 
                        cirMove(); 
                    } 
                } else { 
                    if (page == page_count) { 
                        $banner_ul.animate({ 
                            left: 0 
                        }); 
                        page = 1; 
                        cirMove(); 
                    } else { 
                        $banner_ul.animate({ 
                            left: '-=' + v_width 
                        }, 
                        "slow"); 
                        page++; 
                        cirMove(); 
                    } 
                } 
            } 
        } 
   
        function cirMove() { 
            //检测page的值，使当前的page与selected的小圆点一致 
            $('.banner-circle li').eq(page - 1).addClass('selected').siblings().removeClass('selected'); 
        } 
   
        $banner.mouseover(function() { 
            $btn.css({ 
                'display': 'block' 
            }); 
            clearInterval(timer); 
        }).mouseout(function() { 
            $btn.css({ 
                'display': 'none' 
            }); 
            clearInterval(timer); 
            timer = setInterval(move, 3000); 
        }).trigger("mouseout"); //激活自动播放 
        $btn_a.mouseover(function() { 
            //实现透明渐变，阻止冒泡 
            $(this).animate({ 
                opacity: 0.6 
            }, 
            'fast'); 
            $btn.css({ 
                'display': 'block' 
            }); 
            return false; 
        }).mouseleave(function() { 
            $(this).animate({ 
                opacity: 0.3 
            }, 
            'fast'); 
            $btn.css({ 
                'display': 'none' 
            }); 
            return false; 
        }).click(function() { 
            //手动点击清除计时器 
            btnClass = this.className; 
            clearInterval(timer); 
            timer = setInterval(move, 3000); 
            move($(this), this.className); 
        }); 
   
        $('.banner-circle li').live('click', 
        function() { 
            var index = $('.banner-circle li').index(this); 
            $banner_ul.animate({ 
                left: -v_width * index 
            }, 
            'slow'); 
            page = index + 1; 
            cirMove(); 
        }); 
    }); 
</script>
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