//显示的页码数目
var count_page = 5;
//当前页
var pageNumber;
//总页数
var pageCount;
//开始页码
var start;
//结束页码
var end;
start = Math.max(1, pageNumber - parseInt(count_page / 2));
end = Math.min(pageCount, start + count_page - 1);
start = Math.max(1, end - count_page + 1);
var count_page = 5;
//当前页
var pageNumber;
//总页数
var pageCount;
//开始页码
var start;
//结束页码
var end;
start = Math.max(1, pageNumber - parseInt(count_page / 2));
end = Math.min(pageCount, start + count_page - 1);
start = Math.max(1, end - count_page + 1);