var xmlHttpRequest;   
    function createXMLHttpRequest(){   
        try  
        {   
       // Firefox, Opera 8.0+, Safari   
        xmlHttpRequest=new XMLHttpRequest();   
        }   
     catch (e)   
        {   
  
      // Internet Explorer   
       try  
          {   
           xmlHttpRequest=new ActiveXObject("Msxml2.XMLHTTP");   
          }   
       catch (e)   
          {   
  
          try  
             {   
              xmlHttpRequest=new ActiveXObject("Microsoft.XMLHTTP");   
             }   
          catch (e)   
             {   
             alert("您的浏览器不支持AJAX！");   
             return false;   
             }   
          }   
        }   
  
    }   
    //发送请求函数   
    function getcdk(id){   
        createXMLHttpRequest();   
		var post="game_id="+id;//构造要携带的数据 
        xmlHttpRequest.open("POST","getcdk.php",true);   
        xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded");   
        xmlHttpRequest.onreadystatechange = processResponse;   
        xmlHttpRequest.send(post);   
    }   
    //处理返回信息函数   
    function processResponse(){   
        if(xmlHttpRequest.readyState == 4){   
            if(xmlHttpRequest.status == 200){   
                var res = xmlHttpRequest.responseText;   
                document.getElementById('text').innerHTML = res;  
            }else{   
                window.alert("请求页面异常");   
            }   
        }   
    }