JQuery页面图片切换和新闻列表滚动效果的具体实现

最近用到一个页面上图片左右切换和新闻列表滚动呈现的效果，整理如下：

前段代码：

复制代码 代码如下:














   
       
           

               


               


               


               


           

       
   
   
        新闻中心
       
         

           
• 新闻标题1


           
• 新闻标题2


           
• 新闻标题3


           
• 新闻标题4


           
• 新闻标题5


         

       
   





css文件夹包含一个样式表css.css：

复制代码 代码如下:

body{background:#fff;color:#444;height:100%;line-height:1.4;}
html{height:100%;overflow-y:scroll;-webkit-text-size-adjust:none;}
body,input,button,textarea,select,h1,h2,h3,h4,h5,h6{font:12px/1.5 Arial,Tahoma,Helvetica,"5b8b4f53",sans-serif;}
body,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,button,textarea,blockquote,th,td{margin:0;padding:0;}
img{vertical-align:bottom;}

a:link,a:visited,a:hover,a:active{cursor:pointer;text-decoration:none;}
a:active,a:focus {-moz-outline:none;outline:none;ie-dummy:expression(this.hideFocus=true);}
a:hover {text-decoration:underline;}
li {list-style:none;}
ol li {display:inline;}

.outer{position:relative; overflow:hidden; background:url(../images/line.gif) repeat-x bottom; border-bottom:solid 1px #fff; margin:0 auto;}
.banner{position:absolute; left:50%; top:0; margin-left:-990px; height:400px; width:1980px;overflow:hidden;}
    .flash_img {
        overflow: hidden;
        width: 1980px;
        height: 400px;
        position: relative
    }
    .banner{height:400px;}

    .flash_img .img-box {
        position: absolute;
    }
    .flash_img .img-box li{float:left;}

    .flash_img img {
        display: block;
    }

    .flash_item {
        position: absolute;
        right: 510px;
        bottom: 10px;
        height: 12px;
    }

    .flash_item li {
        background:url(../images/flash_item.png) no-repeat right;
        color: #D94B01;
        cursor: pointer;
        float: left;
        font-size: 12px;
        height: 12px;
        line-height: 12px;
        margin-left: 15px;
        text-align: center;
        width: 12px;
    }

    .flash_item li.on
    {
        background-position:left;
        color: #FFFFFF;
        font-weight: bold;
        height: 12px;
        line-height: 12px;
        width: 12px;
    }

    .flash_item li img {
        display: block
    }   

.indexNews{width:700px; height:29px; bottom:0; left:50%; position:absolute; margin-left:-480px; z-index:999;}
.indexNews strong{color:#409dd9;float: left;}
.indexNews strong a{color:#409dd9;text-decoration:none;}
.indexNews .core{height:18px; line-height:18px; overflow:hidden;}
.indexNews .core span{color:#409dd9; margin-right:20px;}
.indexNews .core a{margin-left:10px;color:#666;}
.outer{height:440px;}

js文件夹包含三个文件：jquery-1.7.2.min.js、indexPic.js、kxbdSuperMarquee.js。第一个可以在网上直接下载，第二个是切换图片，第三个滚动新闻列表。

indexPic.js：

复制代码 代码如下:
document.writeln("");
document.writeln("");
(function($) {
    $.fn.slideImg = function(settings) {
        settings = jQuery.extend({
            speed: "normal",
            timer: 1000
        }, settings);
        return this.each(function() {
            $.fn.slideImg.scllor($(this), settings);
        });
    };

    $.fn.slideImg.scllor = function($this, settings) {
        var index = 0;
        var scllorer = $(".img-box li", $this);
        var size = scllorer.size();
        var slideW = scllorer.outerWidth();
        var $selItem = $("

", {
            "class": "flash_item",
            html: function() {
                var $selItemHTML = "";
                if (size == 1) {
                    return;
                } else if (size > 1) {
                    for (var i = 0; i < size; i++) {
                        i == 0 ? $selItemHTML += '

' : $selItemHTML += '

';
                    }
                    return $selItemHTML;
                }
            }
        }).appendTo($this);
        var li = $(".flash_item li", $this);
        var showBox = $(".img-box", $this);
        var intervalTime = null;
        li.hover(function() {
            var that = this;
            if (intervalTime) {
                clearInterval(intervalTime);
            }
            intervalTime = setTimeout(function() {
                index = li.index(that);
                ShowAD(index);
            }, 200);
        }, function() {
            clearInterval(intervalTime);
            interval();
        });
        showBox.hover(function() {
            if (intervalTime) {
                clearInterval(intervalTime);
            }
        }, function() {
            clearInterval(intervalTime);
            interval();
        });
        function interval() {
            intervalTime = setInterval(function() {
                ShowAD(index);
                index++;
                if (index == size) {
                    index = 0;
                }
            }, settings.timer);
        }
        interval();
        var ShowAD = function(i) {
            showBox.animate({ "left": -i * slideW }, settings.speed);
            li.eq(i).addClass("on").siblings().removeClass("on");
        };
    };
})(jQuery);

kxbdSuperMarquee.js：

复制代码 代码如下:

(function($){

    $.fn.kxbdSuperMarquee = function(options){
        var opts = $.extend({},$.fn.kxbdSuperMarquee.defaults, options);

        return this.each(function(){
            var $marquee = $(this);//滚动元素容器
            var _scrollObj = $marquee.get(0);//滚动元素容器DOM
            var scrollW = $marquee.width();//滚动元素容器的宽度
            var scrollH = $marquee.height();//滚动元素容器的高度
            var $element = $marquee.children(); //滚动元素
            var $kids = $element.children();//滚动子元素
            var scrollSize=0;//滚动元素尺寸
            var _type = (opts.direction == 'left' || opts.direction == 'right') ? 1:0;//滚动类型，1左右，0上下
            var scrollId, rollId, isMove, marqueeId;
            var t,b,c,d,e; //滚动动画的参数,t:当前时间，b:开始的位置，c:改变的位置，d:持续的时间，e:结束的位置
            var _size, _len; //子元素的尺寸与个数
            var $nav,$navBtns;
            var arrPos = [];
            var numView = 0; //当前所看子元素
            var numRoll=0; //轮换的次数
            var numMoved = 0;//已经移动的距离

            //防止滚动子元素比滚动元素宽而取不到实际滚动子元素宽度
            $element.css(_type?'width':'height',10000);
            //获取滚动元素的尺寸
            var navHtml = '

';
            if (opts.isEqual) {
                _size = $kids[_type?'outerWidth':'outerHeight']();
                _len = $kids.length;
                scrollSize = _size * _len;
                for(var i=0;i<_len;i++){
                    arrPos.push(i*_size);
                    navHtml += '
• '+ (i+1) +'
';
                }
            }else{
                $kids.each(function(i){
                    arrPos.push(scrollSize);
                    scrollSize += $(this)[_type?'outerWidth':'outerHeight']();
                    navHtml += '
• '+ (i+1) +'
';
                });
            }
            navHtml += '

';

            //滚动元素总尺寸小于容器尺寸，不滚动
            if (scrollSize<(_type?scrollW:scrollH)) return;
            //克隆滚动子元素将其插入到滚动元素后，并设定滚动元素宽度
            $element.append($kids.clone()).css(_type?'width':'height',scrollSize*2);

            //轮换导航
            if (opts.navId) {
                $nav = $(opts.navId).append(navHtml).hover( stop, start );
                $navBtns = $('li', $nav);
                $navBtns.each(function(i){
                    $(this).bind(opts.eventNav,function(){
                        if(isMove) return;
                        if(numView==i) return;
                        rollFunc(arrPos[i]);
                        $navBtns.eq(numView).removeClass('navOn');
                        numView = i;
                        $(this).addClass('navOn');
                    });
                });
                $navBtns.eq(numView).addClass('navOn');
            }

            //设定初始位置
            if (opts.direction == 'right' || opts.direction == 'down') {
                _scrollObj[_type?'scrollLeft':'scrollTop'] = scrollSize;
            }else{
                _scrollObj[_type?'scrollLeft':'scrollTop'] = 0;
            }

            if(opts.isMarquee){
                //滚动开始
                //marqueeId = setInterval(scrollFunc, opts.scrollDelay);
                marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                //鼠标划过停止滚动
                $marquee.hover(
                    function(){
                        clearInterval(marqueeId);
                    },
                    function(){
                        //marqueeId = setInterval(scrollFunc, opts.scrollDelay);
                        clearInterval(marqueeId);
                        marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                    }
                );

                //控制加速运动
                if(opts.controlBtn){
                    $.each(opts.controlBtn, function(i,val){
                        $(val).bind(opts.eventA,function(){
                            opts.direction = i;
                            opts.oldAmount = opts.scrollAmount;
                            opts.scrollAmount = opts.newAmount;
                        }).bind(opts.eventB,function(){
                            opts.scrollAmount = opts.oldAmount;
                        });
                    });
                }
            }else{
                if(opts.isAuto){
                    //轮换开始
                    start();

                    //鼠标划过停止轮换
                    $marquee.hover( stop, start );
                }

                //控制前后走
                if(opts.btnGo){
                    $.each(opts.btnGo, function(i,val){
                        $(val).bind(opts.eventGo,function(){
                            if(isMove == true) return;
                            opts.direction = i;
                            rollFunc();
                            if (opts.isAuto) {
                                stop();
                                start();
                            }
                        });
                    });
                }
            }

            function scrollFunc(){
                var _dir = (opts.direction == 'left' || opts.direction == 'right') ? 'scrollLeft':'scrollTop';

                if(opts.isMarquee){
                    if (opts.loop > 0) {
                        numMoved+=opts.scrollAmount;
                        if(numMoved>scrollSize*opts.loop){
                            _scrollObj[_dir] = 0;
                            return clearInterval(marqueeId);
                        }
                    }
                    var newPos = _scrollObj[_dir]+(opts.direction == 'left' || opts.direction == 'up'?1:-1)*opts.scrollAmount;
                }else{
                    if(opts.duration){
                        if(t++                            isMove = true;
                            var newPos = Math.ceil(easeOutQuad(t,b,c,d));
                            if(t==d){
                                newPos = e;
                            }
                        }else{
                            newPos = e;
                            clearInterval(scrollId);
                            isMove = false;
                            return;
                        }
                    }else{
                        var newPos = e;
                        clearInterval(scrollId);
                    }
                }

                if(opts.direction == 'left' || opts.direction == 'up'){
                    if(newPos>=scrollSize){
                        newPos-=scrollSize;
                    }
                }else{
                    if(newPos<=0){
                        newPos+=scrollSize;
                    }
                }
                _scrollObj[_dir] = newPos;

                if(opts.isMarquee){
                    marqueeId = setTimeout(scrollFunc, opts.scrollDelay);
                }else if(t                    if(scrollId) clearTimeout(scrollId);
                    scrollId = setTimeout(scrollFunc, opts.scrollDelay);
                }else{
                    isMove = false;
                }

            };

            function rollFunc(pPos){
                isMove = true;
                var _dir = (opts.direction == 'left' || opts.direction == 'right') ? 'scrollLeft':'scrollTop';
                var _neg = opts.direction == 'left' || opts.direction == 'up'?1:-1;

                numRoll = numRoll +_neg;
                //得到当前所看元素序号并改变导航CSS
                if(pPos == undefined&&opts.navId){
                    $navBtns.eq(numView).removeClass('navOn');
                    numView +=_neg;
                    if(numView>=_len){
                        numView = 0;
                    }else if(numView<0){
                        numView = _len-1;
                    }
                    $navBtns.eq(numView).addClass('navOn');
                    numRoll = numView;
                }

                var _temp = numRoll<0?scrollSize:0;
                t=0;
                b=_scrollObj[_dir];
                //c=(pPos != undefined)?pPos:_neg*opts.distance;
                e=(pPos != undefined)?pPos:_temp+(opts.distance*numRoll)%scrollSize;
                if(_neg==1){
                    if(e>b){
                        c = e-b;
                    }else{
                        c = e+scrollSize -b;
                    }
                }else{
                    if(e>b){
                        c =e-scrollSize-b;
                    }else{
                        c = e-b;
                    }
                }
                d=opts.duration;

                //scrollId = setInterval(scrollFunc, opts.scrollDelay);
                if(scrollId) clearTimeout(scrollId);
                scrollId = setTimeout(scrollFunc, opts.scrollDelay);
            }

            function start(){
                rollId = setInterval(function(){
                    rollFunc();
                }, opts.time*1000);
            }
            function stop(){
                clearInterval(rollId);
            }

            function easeOutQuad(t,b,c,d){
                return -c *(t/=d)*(t-2) + b;
            }

            function easeOutQuint(t,b,c,d){
                return c*((t=t/d-1)*t*t*t*t + 1) + b;
            }

        });
    };
    $.fn.kxbdSuperMarquee.defaults = {
        isMarquee:false,//是否为Marquee
        isEqual:true,//所有滚动的元素长宽是否相等,true,false
        loop: 0,//循环滚动次数，0时无限
        newAmount:3,//加速滚动的步长
        eventA:'mousedown',//鼠标事件，加速
        eventB:'mouseup',//鼠标事件，原速
        isAuto:true,//是否自动轮换
        time:5,//停顿时间，单位为秒
        duration:50,//缓动效果，单次移动时间，越小速度越快，为0时无缓动效果
        eventGo:'click', //鼠标事件，向前向后走
        direction: 'left',//滚动方向，'left','right','up','down'
        scrollAmount:1,//步长
        scrollDelay:10,//时长
        eventNav:'click'//导航事件
    };

    $.fn.kxbdSuperMarquee.setDefaults = function(settings) {
        $.extend( $.fn.kxbdSuperMarquee.defaults, settings );
    };

})(jQuery);

images文件夹用的图标：