a.find("ul").html(htmlall);//html内容还原初始值
a.find(".ps_next").show();//按钮样式初始化
a.find(".ps_pre").hide();
//判断每次滚动数量
/*
var w_body = $("body").width();
if(w_body <=1170){
var num = 3;
}else if(w_body<= 1380){
var num = 4;
}else if(w_body>1380){
var num = 5;
}
*/
var num=3;
//判断需要添加的li节点数量
var reminder=lisize%num;
if(lisize%num!=0){addli = num-reminder;}
else{addli = 0;}
addlist();
w_li = a.find("li").width();
margin_li=parseInt(a.find("li").css("marginLeft"));
a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
a.find("ul").animate({"margin-left":0});//ul位置还原
btnshow(now,parseInt((lisize+addli)/num),lisize,num);
});
function addlist(){
for(i=0;i<addli;i++){
var html = a.find("ul li").eq(i).html();
a.find("ul").append("<li>"+html+"</li>");
}
a.find("ul").css({"width":(w_li+margin_li*2)*(lisize+addli)});
//console.log(a.find("ul li").size());
}
function photoscroll(){
a.find(".ps_pre").on("click",function(){//console.log(num);
now--;
if(now >= 0){
a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
btnshow(now,parseInt((lisize+addli)/num),lisize,num);
}
});
a.find(".ps_next").on("click",function(){//console.log(num);
now++;
if(now < (lisize+addli)/num){
a.find("ul").animate({"margin-left":-now*num*(w_li+margin_li*2)});
btnshow(now,parseInt((lisize+addli)/num),lisize,num);
}
});
btnshow(now,parseInt((lisize+addli)/num),lisize,num);
}
/***
参数说明：
now:当前是第几组，默认是0
c:总共有几组
d:初始化时li的个数
e:每组显示li个数
***/
function btnshow(now,c,d,e){
if(d<=e){//如果初始化时li的个数小于一组要显示的数，则不显示pre和next按钮
a.find(".ps_next").hide();
a.find(".ps_pre").hide();
}else if(now==0){//初始化now=0，显示第一组，只显示next
a.find(".ps_next").show();
a.find(".ps_pre").hide();
}else if(now==c-1){//显示到最后一组，只显示pre
a.find(".ps_next").hide();
a.find(".ps_pre").show();
}else{//显示中间组，pre和next都需要显示
a.find(".ps_next").show();
a.find(".ps_pre").show();
}
}
}
})(jQuery);
$.photolist($("#activity-slide"));
</script>
css部分：
@charset "utf-8";
body, div, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, code, form, fieldset, legend, button, textarea, table, tbody, tfoot, thead, th, td, article, aside, dialog, figure, footer, header, hgroup, menu, nav, section, time, mark, audio, video { margin: 0; padding: 0; outline:nonebackground:transparent;
