表单提交有以下两种方式，请问，有何不同？

1. XMLHttpRequest

     <script type="text/javascript">
         function submitData(){
             var form=document.getElementById("form1");
             var formData=new FormData(form);
             var xhr=new XMLHttpRequest();
             xhr.open("post","index.html",true);
             xhr.onload= function () {
                 if(this.status==200)
                     document.getElementById("res").innerHTML=this.response;
             };
             xhr.send(formData);
         }
     </script>

<form id="form1">
    姓:<input type="text" id="txtFirstName" name="firstname" value="郭" />
    名:<input type="text" id="txtUserName" name="username" value="延思" />
    <input type="button" value="提交" onclick="submitData();" />
</form>

// 服务器端进行处理，node.js
app.post("/index.html", function (req,res) {
    var str="";
    for(var k in req.body){
        str+="键是:"+k+" 值是:"+req.body[k]+"<br/>";
    }
    res.send(str);
});

2. 表单post方法，指定脚本

<form action="/upload" enctype="multipart/form-data" method="post">

通过url="/upload"定义的router里面进行处理：
function upload(request, response) {
    ... // 读取表单信息..
}
--
修改:saynothing FROM 218.108.95.*
FROM 218.108.95.*