Javascript版仿豆瓣分页效果

点击下面的运行，可预览代码效果:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="gb2312" >
<head>
 <meta http-equiv="content-type" content="text/html; charset=gb2312" />
 <meta name="author" content="Smiling Dolphin" />
 <meta name="keywords" content="design, css, cascading, style, sheets, xhtml, graphic design, w3c, web standards, visual, display, java, javascript, c++, php, jsp, asp, py, pl" />
 <meta name="description" content="my favorites language." />
 <meta name="robots" content="all" />
 <title>仿豆瓣分页原型（Javascript版） - twocity.cn</title>
 <style type="text/css" title="currentStyle" media="screen">
  /* Paginator */
  .paginator {
   font: 14.8px normal Arial, Helvetica, sans-serif;
   color: #666666;
   margin-top: 10px;
   margin-bottom: 5px;
   line-height: 150%;
   background-color: #EEFFEE;
   text-align: center;
  }
  .paginator a, .thispage, .break {
   padding: 2px 4px;
  }
  .paginator .prev {
   margin-right: 20px;
  }
  .paginator .next {
   margin-left: 20px;
  }
  .paginator .count {
   margin-left: 20px;
   font-size: 11px;
  }
 </style>
</head>
<body>
<div id="pagebar" class="paginator"></div>
<script language="javascript" type="text/javascript">
function QueryString(item){
 var sValue=location.search.match(new RegExp("[\?\&]"+item+"=([^\&]*)(\&?)","i"))
 return sValue?sValue[1]:sValue
}
var count = 560;
var perpage = 20;
var currentpage = QueryString("page");
if (currentpage==null){
 currentpage = 1;
}else{
 currentpage = parseInt(currentpage);
}
var pagecount = Math.floor(count/perpage);
var pagestr = "";
var breakpage = 9;
var currentposition = 4;
var breakspace = 2;
var maxspace = 4;
var prevnum = currentpage-currentposition;
var nextnum = currentpage+currentposition;
if(prevnum<1) prevnum = 1;
if(nextnum>pagecount) nextnum = pagecount;
pagestr += (currentpage==1)?'<span class="prev">< 前页</span>':'<span class="prev">< <a href="?page='+(currentpage-1)+'">前页</a></span>';
if(prevnum-breakspace>maxspace){
 for(i=1;i<=breakspace;i++)
  pagestr += '<a href="?page='+i+'">'+i+'</a>';
 pagestr += '<span class="break">...</span>';
 for(i=pagecount-breakpage+1;i<prevnum;i++)
  pagestr += '<a href="?page='+i+'">'+i+'</a>';
}else{
 for(i=1;i<prevnum;i++)
  pagestr += '<a href="?page='+i+'">'+i+'</a>';
}
for(i=prevnum;i<=nextnum;i++){
 pagestr += (currentpage==i)?'<span class="thispage">'+i+'</span>':'<a href="?page='+i+'">'+i+'</a>';
}
if(pagecount-breakspace-nextnum+1>maxspace){
 for(i=nextnum+1;i<=breakpage;i++)
  pagestr += '<a href="?page='+i+'">'+i+'</a>';
 pagestr += '<span class="break">...</span>';
 for(i=pagecount-breakspace+1;i<=pagecount;i++)
  pagestr += '<a href="?page='+i+'">'+i+'</a>';
}else{
 for(i=nextnum+1;i<=pagecount;i++)
  pagestr += '<a href="?page='+i+'">'+i+'</a>';
}
pagestr += (currentpage==pagecount)?'<span class="next">后页 ></span>':'<span class="next"><a href="?page='+(currentpage+1)+'">后页</a> ></span>';
document.getElementById("pagebar").innerHTML = pagestr;
</script>
</body>
</html>

[Ctrl+A 全部选择提示：你可先修改部分代码，再按运行]
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