ajax实现标签导航

答案：主要函数:
复制代码 代码如下:

<!-- 
function getObject(objectId) { 
     if(document.getElementById && document.getElementById(objectId)) { 
    // W3C DOM 
       return document.getElementById(objectId); 
     }  
     else if (document.all && document.all(objectId)) { 
    // MSIE 4 DOM 
       return document.all(objectId); 
     }  
     else if (document.layers && document.layers[objectId]) { 
    // NN 4 DOM.. note: this won't find nested layers 
       return document.layers[objectId]; 
     }  
     else { 
       return false; 
    } 
}  

var responsecont; 
var xmlHttp; 
var requestType; 
var newsstring; 

function CreateXMLHttpRequest(){ 
   // Initialize Mozilla XMLHttpRequest object 
   if (window.XMLHttpRequest){ 
       xmlHttp = new XMLHttpRequest(); 
   }  
   // Initialize for IE/Windows ActiveX version 
   else if (window.ActiveXObject) { 
       try{ 
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP.3.0"); 
       }  
       catch (e){ 
            try{ 
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 
            } 
            catch (e){newsstring = "<div class='loading'>Loading rquest content fail, Please try it again latter...</div>";} 
       } 
   } 
} 

function getnews(tagid,x){ 
   var url = tagid+'_'+x+'.htm'; 
   var loadstatustext="<div class='loading'><img src='images/loading.gif' /> Loading request content, please wait...</div>"; 
   requestType = tagid; 
   CreateXMLHttpRequest();    

   getObject(requestType+'_cnt').innerHTML = loadstatustext; 
   xmlHttp.onreadystatechange = processRequestChange; 
   xmlHttp.open("GET", url, true); 
   xmlHttp.setRequestHeader("If-Modified-Since","0"); 
   xmlHttp.send(null);   
} 

function processRequestChange(){ 
   // only if xmlHttp shows "complete" 
   if (xmlHttp.readyState == 4){ 
      // only http 200 to process 
      if (window.location.href.indexOf("http")==-1 || xmlHttp.status == 200){ 
         newsstring = xmlHttp.responseText; 
         //inject centent to tab-pane 
            shownews(requestType,newsstring); 
      } 
   } 
} 

function shownews(requestType,newsstring){ 
//<![CDATA[ 
    responsecont = getObject(requestType+'_cnt'); 
    responsecont.innerHTML = newsstring; 
//]]> 
} 

function TabNews(tagid,x){ 
    for (var i=1;i<=7;i+=2) { 
         if (i == x) { 
            getObject(tagid+i).className="tabactive"+i; 
            if(i!=1){ 
               getObject(tagid+(i-1)).style.display="none";                
               if(i!=7){ 
                  getObject(tagid+(i+1)).style.display="none"; 
               }                  
            } 
            if(i==1){ 
               getObject(tagid+"2").style.display="none"; 
            }  
            try{             
               getnews(tagid,i); 
            } 
            catch(e){ 
               alert(e); 
            }   
        } 
        else 
        { 
            getObject(tagid+i).className="";             
            if(i!=7){ 
               getObject(tagid+(i+1)).style.display="block"; 
            }              
        }          
   } 
} 
//--> 


调用方法:
复制代码 代码如下:
<li style="cursor:pointer" id="tab3" onclick="TabNews('tab',3)">最新折扣信息</li>

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