ajax核心js代码

<script type="text/javascript" >
             var xmlHttp ;
             function createXmlHttp(){
                   if(window .XMLHttpRequest){
                         //针对firefox,mozillar,opera,safari,IE7,IE8
                         xmlHttp = new XMLHttpRequest();
                         //针对某些特定版本的mozillar浏览器的bug进行修正
                         if(xmlHttp .overrideMimeType){
                               xmlHttp.overrideMimeType ("text/xml");
                         }
                   }else  if(window .ActiveXObject){
                         //针对IE6,IE5.5,IE5
                         try{
                               xmlHttp=new ActiveXObject("MSXML2.XMLHTTP" );
                         }catch( e){
                               try{
                                     xmlHttp=new ActiveXObject("Microsoft.XMLHTTP" );
                               }catch( e){
                                     alert("不能创建XmlHttpRequest" );
                               }
                         }
                   }
             }
           
             function checkemail( obj){
                   createXmlHttp();
                 
                   var url = "reg?email=" +obj+ "&k=" +Math. random();
                   xmlHttp.open ('get', url,true);
                   xmlHttp.send (null);
                 
                   xmlHttp.onreadystatechange = callback;
             }
           
           
             function callback(){
                 
                   if(xmlHttp .readyState == 4 ){
                         document.getElementById ("emailError").innerHTML = xmlHttp .responseText;
                   }
             }
           
           
           
       </script>


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