rails backbone - rest api - ajax function

ajaxFunc.js

function getData(){
  $.get('http://localhost:3000/posts.json');
}

function postData(){
var url ='http://localhost:3000/posts';
var data = {title:"asdf",content:"asdf"};

    $.ajax({  
      type: "POST",  
      url: url,  
   data: {"post":{"title":"foo","content":"bar"}},
      success: function() {  
// stub
  alert('done')
      },
      dataType: 'json'  
    });  
}

function deleteData(){
var url = 'http://localhost:3000/posts/70';
var success = function(){
  alert('foo');
}
  $.ajax({
    url: url,
    type:'DELETE',
    success:success
  });
}