项目中js使用ajax请求

<script type=text/javascript>
document.getElementById('tbody_2c923daf6c462275016c4c63dde01400').onclick=function(){
var projectid=document.getElementById('field_2c923daf6c462275016c4c64f40a1409').value;
var name=document.getElementById('field_828081188164f5a601816628cfe70011').value;

if(projectid != null || projectid !=''){
var ajax=null;
if(window.XMLHttpRequest){
ajax=new XMLHttpRequest();
}else{
ajax=new ActiveXObject("Microsoft.XMLHttp");
}
var _url = "http://localhost:8080/changename.do?projectid=" +projectid+ "";
ajax.open('GET',_url,true);
ajax.send(null);
ajax.onreadystatechange=function(){
if (ajax.readyState == 4 && ajax.status == 200) {
var result=JSON.parse(ajax.responseText);
console.log(result.isOk)
if(result.isOk == 1){
console.log(result.resultName)
var date=getMonth();
document.getElementById('field_828081188164f5a601816628cfe70011').value=result.resultName+date;
}
}
}

}

}

function getMonth(){
var today=new Date();
var getYear=today.getYear();
var month=today.getMonth() +1;
if(month >=1 && month<=3){
var data=getYear+'第一季度';
return data;
}else if(month >=4 && month<=6){
var data=getYear+'第二季度';
return data;
}else if(month >=7 && month<=9){
var data=getYear+'第三季度';
return data;
}else{
var data=getYear+'第四季度';
return data;
}
}
</script>