基于jquery的无缝循环新闻列表插件_jquery

(function($){
$.fn.extend({
newsList:function(options){
var defaults ={
actName:'li', //显示条数名；
maxShowNum:'6', //最多的显示条数；
actNameH:'28', //一次移动的距离；
ulClass:'.ul_news_list', //被复制层的class
copyUlClass:'.ul_news_list2', //复制层的class
autoTime:'1500', //自动运行时间；
clickGoUpC:'.go_uplist', //点击向上class;
clickDownUpC:'.go_downlist', //点击向下class;
goStart:'go_tart',
autoCloss:'flase' //自动运行开关,当为'flase'时为开，其它则关；
} ;

options = $.extend(defaults, options);
return this.each(function(){
var o = options;
var counts =1;
var linum = $($(this).find(o.actName),$(this)).size();
var ul_class = $($(this).find(o.ulClass),$(this));
var copy_ul_class = $($(this).find(o.copyUlClass),$(this));
var click_go_up_c = $($(this).find(o.clickGoUpC),$(this));
var click_go_down_C = $($(this).find(o.clickDownUpC),$(this));
var go_start = $($(this).find(o.goStart),$(this));
if(linum > o.maxShowNum){
$(copy_ul_class).html($(ul_class).html());
goStartList();
}
var thiswrap = $($(ul_class).parent().parent(),$(this));
//自动运行函数
function auto_function(){
if(counts $(ul_class).animate({top:'-=' + o.actNameH},o.autoTime);
$(copy_ul_class).animate({top:'-=' + o.actNameH},o.autoTime);
counts++;
}else{
$(ul_class).animate({top:0},0);
$(copy_ul_class).animate({top:0},0);
counts = 1;
}
}
//点击向上移动时；
if(linum > o.maxShowNum){
$(click_go_up_c).click(function(){
if(counts $(ul_class).animate({top:'-=' + o.actNameH},0);
$(copy_ul_class).animate({top:'-=' + o.actNameH},0);
counts++;
}else{
$(ul_class).animate({top:0},0);
$(copy_ul_class).animate({top:0},0);
counts = 1;
}
});
}
//点击向下移动时；
if(linum > o.maxShowNum){
$(click_go_down_C).click(function(){
if(counts > 1){
counts--;
$(ul_class).animate({top:'-'+ counts*o.actNameH},0);
$(copy_ul_class).animate({top:'-'+ counts*o.actNameH},0);
}else{
$(ul_class).animate({top:0},0);
$(copy_ul_class).animate({top:0},0);
counts = linum+1;
}
});
}
//鼠标经过所发生的开始停止；
if(linum > o.maxShowNum){
$(thiswrap).hover(function(){
goStopList();
},function(){
goStartList();
});
}
function goStartList(){
if(o.autoCloss === 'flase'){
go_start = setInterval(auto_function,o.autoTime);
}
}
function goStopList(){
clearInterval(go_start);
}
});
}
});
}(jQuery));

body { font-family:"微软雅黑",Arial,"Lucida Grande", Verdana, Lucida; font-size:12px; }
*{ padding:0; margin:0;}
img { border:0;}
.clear { clear:both;}
a { color:#000; text-decoration:none;}
a:hover { color:#EC6104; text-decoration:none;}
.undis { display:none;}/*news_list*/
.news_list_bar { position:relative; width:560px; height:168px; overflow:hidden; background:url(../images/slideshow2/v3_picture6.gif) repeat-y; background-color:#F00;}
.ul_news_list,
.ul_news_list2{ position:relative; list-style:none;}
.ul_news_list li,
.ul_news_list2 li{line-height:28px; height:28px; width:500px; overflow:hidden; white-space:nowrap;padding:0 20px;}
.ul_news_list li a,
.ul_news_list2 li a{ padding-right:20px;}
.go_upanddown { position:absolute; margin:-20px 0 0 500px;}
.go_upanddown span { padding-right:10px; cursor:pointer;}