/**  * 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);