原生Ajax post提交

原生Ajax post提交

function CreateXmlRequest(){
 var xmlHttp=null;
 if(window.XMLHttpRequest){
  xmlHttp=new XMLHttpRequest();
 }else if(window.ActiveXObject){
  try {
   xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
   try {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
   } catch (failed) {
    xmlHttp=false;
   }
  }
  
 }
 return xmlHttp;
}

function CreateAdd(){
 var username=document.getElementById("username").value;
 var password=document.getElementById("password").value;
 alert("password="+password)
 var request=CreateXmlRequest();
 if(!request){
  document.getElementById("show").innerHTML="当前浏览器不支持javascript";
 }else{
  var content="username="+username+"&password="+password;
  request.open("post","addObj",false);
  request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
  request.send(content);
  request.onreadystatechange=function(){
   if(request.readyState==4){
    document.getElementById("show").innerHTML="loading...";
    if(request.status==200){
     var result=request.responseText;
     alert(result)
     if(result=="add"){
      document.getElementById("show").innerHTML="增加成功";
     }else if(result=="notadd"){
      document.getElementById("show").innerHTML="增加失败";
     }
    }
    
   }
  }
  
  
  
  document.getElementById("show").innerHTML="";
 }
}