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="";}}