//新闻滚动(function($) {  $.fn.myScroll = function(options) {    var opts = $.extend(true, {},    $.fn.myScroll.defaults, options);    return this.each(function() {        var $this = $(this);        var $li=$this.find("li"),            li_len=$li.length,            li_height=$li.outerHeight(),            page_li_len=Math.floor($this.height()/li_height),            page=Math.ceil(li_len/page_li_len),            scrollHeight=li_height*(page_li_len),            li_width=$li.width(),            index=0;        var slideFunc=function(){            if(index>=page){index=0;}else if(index<=-1){index=page-1;}            console.log(index);            $this.find("ul").animate({marginTop:-index*scrollHeight});            };        $this.find(".prev").on("click",function(){            index=index-1;            slideFunc();        });        $this.find(".next").on("click",function(){            index=index+1;            slideFunc();        });    });  };  $.fn.myScroll.defaults = {  };})(jQuery);