jquery图片切换插件

/**

 * 图片切换插件

 * Dependence jquery-1.7.2.min.js

 **/

(function ($) {

  //调用方式 $('#silder').imgSilder({s_width:564, s_height:293, is_showTit:true, s_times:3000,css_link:'css/style.css'});  容器必须加入 id silder_list or class silder_list

  /*参考结构

    <div class="silder" id="silder">

        <ul class="silder_list" id="silder_list">

            <li>

                <img src="css/img/1.jpg" border="0" alt="刘淇同志参观北京市志愿者之家">

            </li>

            <li>

                <img src="css/img/2.jpg" border="0" alt="刘淇同志与志愿者合影">

            </li>

            <li>

                <img src="css/img/3.jpg" border="0" alt="刘淇同志到北京大学人民医院调研">

            </li>

            <li>

                <img src="css/img/4.jpg" border="0" alt="2013中国志愿服务国际交流大会在京举行">

            </li>                    

        </ul>

    </div>

  */

  $.fn.silderDefaults = { //默认参数

    s_width:500, //容器宽度

    s_height:500, //容器高度

    is_showTit:true, // 是否显示图片标题 false :不显示，true :显示

    s_times:3000, //设置滚动时间

    css_link:'css/style.css'

  };

  $.extendSilder = function (obj,opt) { //obj 元素对象，opt 参数对象

    var g = {  //公共方法， 外部可调用

      //初始化

        init: function () {

            var wh ={width:opt.s_width,height:opt.s_height};

            var pagesize=0; //页码

            var silderList = $('#silder_list',g.obj);

            var silderList_li = $('#silder_list li',g.obj);

            g.LoadCSS(opt.css_link); //样式文件导入

            g.obj.css(wh); silderList.css(wh); silderList_li.find('img').css(wh); //设置宽高属性

            var currHtml = ""; //加入播放页码 及文字描述

            if(opt.is_showTit){ //判断是否显示标题

                currHtml += "<div class='silder_desc' id='silder_desc'></div>";

            }

            img_size = silderList_li.size() ;//图片个数

            currHtml += "<ul class='silder_page' id='silder_page'>";//分页码代码注入

            for(var i=0; i < img_size; i++){

                currHtml += "<li>"+ parseInt((1 + i),10) +"</li>";

            }

            currHtml +="</ul>";

            silderList_li.eq(0).show().siblings().hide(); //初始化隐藏其他图片

            g.obj.append(currHtml);//注入分页码

            var silderPage = $('#silder_page',g.obj);

            var silderPage_li =$('#silder_page li',g.obj);

            silderPage_li.eq(0).addClass('current');

            if(opt.is_showTit){ //初始化图片描述

                $('#silder_desc').text(silderList_li.eq(0).find('img').attr('alt'));

            }

            silderPage_li.on('click',function(){

                pagesize = $(this).index();

                silderList_li.eq(pagesize).fadeIn(1000).siblings().fadeOut(100);

                $(this).addClass('current').siblings().removeClass('current');

                if(opt.is_showTit){

                    $('#silder_desc').text(silderList_li.eq(pagesize).find('img').attr('alt'));

                }

            });

            var t;

            silderList.hover(function(){window.clearInterval(t); return;},function(){ t = window.setInterval(function(){

                if(pagesize < img_size && pagesize >= 0)

                {

                    silderList_li.eq(pagesize).fadeIn(1000).siblings().fadeOut(100);

                    silderPage_li.eq(pagesize).addClass('current').siblings().removeClass('current');

                    if(opt.is_showTit){

                        $('#silder_desc').text(silderList_li.eq(pagesize).find('img').attr('alt'));

                    }

                    pagesize++;

                    if(pagesize >= img_size){

                        pagesize = 0;

                    }

                }

            },opt.s_times);}).trigger("mouseout"); //悬浮时 停止自动动画,trigger 起默认触发作用

        },

          LoadCSS:function(url){ //新建css

            var s = document.createElement("LINK");

                s.rel = "stylesheet";

                s.type = "text/css";

                s.href = url;

                document.getElementsByTagName("HEAD")[0].appendChild(s);

          }

    };

    g.obj = $(obj);

    g.init();

    return g;

  }

  $.fn.imgSilder = function (options) {

    if (this.length == 0) return; //判断对象是否存在

    this.each(function () {

      if (this.usedSilder) return;

      var opt = $.extend({}, $.fn.silderDefaults, options); //合并已赋值参数

      this.usedSilder = $.extendSilder(this, opt);

    });

  }

})(jQuery);

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