Node post request

I'm trying to alert a log in success box after user has enter the name and pw using node server..This is the code for the button

<script>
      $(document).ready(function(){
        var user,pass;
        $("#submit").click(function(){
          user=$("#user").val();
          pass=$("#password").val();
          $.post("/login",{user: user,password: pass}, function(data){
            if(data)
              {
                alert("login success");
              }
          });
        });
      });
</script>

This is the code for the post method..

 app.post('/login',function(req,res){
  var user_name=req.body.user;
  var password=req.body.password;
   console.log("User name = "+user_name+", password is "+password);
 res.sendStatus(200);
  res.end("yes");
});

Also, can i know where is a better place to learn these? like how does people kow res.sendStatus is there & how do use it ?

via newB