一个通用的JavaScript分页

一个通用的JavaScript分页
1.JavaScript代码
Pagination=function(id)
{
var totalNum=0;
var maxNum=10;
var pageUrl="";
var breakpage = 5;
var currentposition = 0;
var breakspace = 2;
var maxspace = 4;
var currentpage=1;
var perpage=10;
var id =id;
this.initPage = function(pageName)
{
var count = this.getTotalNum();
perpage = this.getMaxNum();
if (currentpage==null){
currentpage = 1;
}else{
currentpage = parseInt(currentpage);
}
var pagecount = Math.floor(count/perpage)+1;

var pagestr = "";
var prevnum = currentpage-currentposition;
var nextnum = currentpage+currentposition;
if(prevnum<1) prevnum = 1;
if(nextnum>pagecount) nextnum = pagecount;
pagestr += (currentpage==1)?'<span class="disabled"> <上一页</span>':'<span><a href="javascript:'+pageName+'.page_onclick('+(this.getIndexPage()-1)+',\''+pageName+'\')"><上一页</a></span>';
if(prevnum-breakspace>maxspace){
for(i=1;i<=breakspace;i++)
pagestr += '<a href="javascript:'+pageName+'.page_onclick('+i+',\''+pageName+'\')">'+i+'</a>';
pagestr += '...';
for(i=pagecount-breakpage+1;i<prevnum;i++)
pagestr += '<a href="javascript:'+pageName+'.page_onclick('+i+',\''+pageName+'\')">'+i+'</a>';
}else{
for(i=1;i<prevnum;i++)
pagestr += '<a href="javascript:'+pageName+'.page_onclick('+i+',\''+pageName+'\')">'+i+'</a>';
}
for(i=prevnum;i<=nextnum;i++){
pagestr += (currentpage==i)?'<span class="current">'+i+'</span>':'<a href="javascript:'+pageName+'.page_onclick('+i+',\''+pageName+'\')">'+i+'</a>';
}
if(pagecount-breakspace-nextnum+1>maxspace){
for(i=nextnum+1;i<=breakpage;i++)
pagestr += '<a href="javascript:'+pageName+'.page_onclick('+i+',\''+pageName+'\')">'+i+'</a>';
pagestr += '<span class="break">...</sp