科讯sql商业版中用到的ajax空间与分页函数,他们的js代码学习是非常不错的
//ajax 控件
function pageajax(){
    var xhrobj=null;
    if(window.xmlhttprequest)
    {
    xhrobj=new xmlhttprequest();
    }
    else if(window.activexobject)
    {
    try{
    xhrobj=new activexobject(microsoft.xmlhttp);
    }
    catch(e1)
    {
    try{
    xhrobj=new activexobject(msxml2.xmlhttp);
    }
    catch(e2){
    try{
    xhrobj=new activexobject(msxml3.xmlhttp);
    }
    catch(e3){
    alert(创建ajax失败：+e3)
    }
    }
    }
    }
    else
    {
    alert(未能识别的浏览器);
    }
    return xhrobj;
}
function page(curpage,labelid,classid,installdir,url,refreshtype,specialid)
   {
   this.labelid=labelid;
   this.classid=classid;
   this.url=url;
   if (labelid.substring(0,5)=={sql_)
   {
    var slabelid=labelid.split('(')[0];
    slabelid=slabelid.replace({,);
    this.c_obj=c_+slabelid;
    this.p_obj=p_+slabelid;
   }
   else
   {
   this.c_obj=c_+labelid;
   this.p_obj=p_+labelid;
   }
   this.installdir=installdir;
   this.refreshtype=refreshtype;
   this.specialid=specialid;
   this.page=curpage;
   loaddata(1);
   }
function loaddata(p)
{  this.page=p;
   var xhr=new pageajax();
   xhr.open(get,installdir+url+?labelid=+escape(labelid)+&classid=+classid+&refreshtype=+refreshtype+&specialid= +specialid+&curpage=+p,true);
   xhr.onreadystatechange=function (){
             if(xhr.readystate==1)
              {
                 if (p==1)
                eval('document.all.'+c_obj).innerhtml=
正在连接服务器...
;
              }
              else if(xhr.readystate==2 || xhr.readystate==3)
              {
                if (p==1)
                eval('document.all.'+c_obj).innerhtml=正在读取数据...
;
              }
              else if(xhr.readystate==4)
              {
             if (xhr.status==200)
             {
                  var pagearr=xhr.responsetext.split({ks:page})
                  var pageparamarr=pagearr[1].split(|);
                  count=pageparamarr[0];    
                  perpagenum=pageparamarr[1];
                  pagecount=pageparamarr[2];
                  itemunit=pageparamarr[3];   
                  itemname=pageparamarr[4];
                  pagestyle=pageparamarr[5];
                  getobject(c_obj).innerhtml=pagearr[0];
                  pagelist();
             }
            }
       }
    xhr.send(null); 
}
function getobject(id) 
{
    if(document.getelementbyid) 
    {
        return document.getelementbyid(id);
    }
    else if(document.all)
    {
        return document.all[id];
    }
    else if(document.layers)
    {
        return document.layers[id];
    }
}
function pagelist()
{
 var n=1;    
 var statushtml=null;
 switch(parseint(this.pagestyle))
 {
  case 1:    
     statushtml=共+this.count+this.itemunit+ 首页 上一页 下一页 尾页 页次:+this.page+/+this.pagecount+页 +this.perpagenum+this.itemunit+this.itemname+/页;
        break;
  case 2:
     statushtml=+this.pagecount+页/+this.count+this.itemunit+ 9 7 ;
     var startpage=1;
     if (this.page==10)
       startpage=2;
     else if(this.page>10)
       startpage=eval((parseint(this.page/10)-1)*10+parseint((this.page)%10)+2);
      for(var i=startpage;i          if (i==this.page)
           statushtml+=+i+ 
          else
            statushtml+=+i+ 
            n=n+1;
          if (n>10) break;
      }
     statushtml+=8 :;
     statushtml=+statushtml+;
    break;     
  case 4:
     statushtml=共+this.pagecount+页/+this.count+this.itemunit+this.itemname+ 9 7 ;
      for(var i=this.page;i          if (i==this.page)
           statushtml+=+i+ 
          else
            statushtml+=[+i+] 
            n=n+1;
          if (n>10) break;
      }
     statushtml+=8 :;
    break;     
  case 3:
     statushtml=第+this.page+页 共+this.pagecount+页   > >> +this.perpagenum+this.itemunit+this.itemname+/页;
   break;
 }
     statushtml+= 第;
      for(var i=1;i         if (i==this.page)
         statushtml+=+i+;
         else
         statushtml+=+i+;
      }    
     statushtml+=页;
     getobject(this.p_obj).innerhtml=statushtml;
}
function homepage()
{
   if(this.page==1)
    alert(已经是首页了！)
   else
   loaddata(1);
} 
function lastpage()
{
   if(this.page==this.pagecount)
    alert(已经是最后一页了！)
   else
   loaddata(this.pagecount);
} 
function previouspage()
{
   if (this.page>1)
      loaddata(this.page-1);
   else
      alert(已经是第一页了);      
}
function nextpage()
{
   if(this.page      loaddata(this.page+1);
   else
      alert(已经到最后一页了);
}
function turn(i)
{
     loaddata(i);
}