手动Js——Ajax

<script type="text/javascript">
            var xmlHttpReq;
            //创建XMLHTTP对象
            function createXMLHttpRequest(){
                if(window.ActiveXObject){
                    xmlHttpReq = new ActiveXObject("MSXML2.XMLHTTP.3.0");
                }else{
                    xmlHttpReq = new XMLHttpRequest();
                }
            }
            //检查用户
            function checkUser(){
                createXMLHttpRequest();
                var userName =document.getElementById("userName").value;
                var password =document.getElementById("password").value;
                //处理检查的地址
                var url="checkUser.jsp?userName="+userName+"&password="+password;
                xmlHttpReq.open("GET",url,true);
                xmlHttpReq.onreadystatechange = showResult;//showResult是当onreadystatechange的值改变时触发的javascript函数
                xmlHttpReq.send();
            }

            function showResult(){
                if(xmlHttpReq.readyState == 4){
                    if(xmlHttpReq.status == 200){
                        var result = xmlHttpReq.responseText;//将响应信息作为字符串返回
                        //alert( result);
                        var checkResult = document.getElementById("checkResult").innerHTML="<b>"+result+"</b>";
                        //var b=document.createElement("b");
                        //var resultContent = document.createTextNode(result);
                       // b.appendChild(resultContent);
                       // checkResult.appendChild(b);
                    }
                }
            }
        </script>

 

 

 

 

xmlHttpReq = new ActiveXObject("MSXML2.XMLHTTP.3.0");

   xmlHttpReq.onreadystatechange = ReturnData;

   //xmlHttpReq.open("GET", "GetData.aspx?Type=UserRegister&PetName="+PetName+"&Password="+Password+"&Password2="+Password2,"", false);

   xmlHttpReq.open("GET", "GetData.aspx?Type=UserRegister&PetName="+PetName,"", false);

   xmlHttpReq.send();

xmlHttpReq = new ActiveXObject("MSXML2.XMLHTTP.3.0");   

xmlHttpReq.onreadystatechange =  function(){

               if(xmlHttpReq.readystate == 4 && xmlHttpReq.status == 200)

                   {

                       document.getElementById('checkResult').innerHTML=xmlHttpReq.responseText;

 

                 };

xmlHttpReq.open("GET", "GetData.aspx?Type=UserRegister&PetName="+PetName,"", false);   xmlHttpReq.send();