php – 上传到服务器后不允许使用英特尔XDK Ajax访问[在xampp中

XMLHttpRequest cannot load http://watanydemo.eb2a.com/metawe3/action/get?_=1451186106865. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
index.html:92 {"readyState":0,"status":0,"statusText":"error"}

虽然我通过所有方式设置标题,但仍将原点设置为null

public function get()
{ $this->load->model('Name_model');  
$result = $this->Name_model->read_names();
header('Access-Control-Allow-Origin: *');
header('Content-type: application/json');

echo json_encode($result);
}

NB我的后端是Codeigniter

我的Ajax调用是

<script type="text/javascript">

        $(document).ready(function() {

$('#loading-image').show();
            try {
        $.ajax({
            type: "GET",url: "http://watanydemo.eb2a.com/metawe3/action/get",crossDomain: true,contentType: "application/x-www-form-urlencoded",async: true,dataType: 'json',processData: false,cache: false,success: function (response) {
                alert("valid response");

for (var i = 0,res = response.length; i < res; ++i) {
 var picture = response[i].picurl;
var name= response[i].name;


 $("#row").append('<div class="col-md-4"><h1>'+name+'</h1><img id="pic" class="thumbnail img-responsive" alt="Bootstrap template"src="'+picture+'" />'+'<div class="well"></div></div>');
 }
            },complete: function(){
    $('#loading-image').hide();
  },error: function (ErrorResponse) {
              console.log(JSON.stringify(ErrorResponse));
            }
        });
    }
    catch (error) {
                  console.log(JSON.stringify(error));

    }


    });  

    </script>