How to use $.ajax to load a local file?

How to use $.ajax to load a local file?

e.g.

$.ajax({
      url: "../config.json",
      dataType: "json",
      success: function(data) {
            setting(data);
      }
});

function setting(data) {
      // some codes that must use "data" to create a page
}

when I put the html and js on service, it will run rightly, but if I run the html file simply, without any service, it's invalid in Firefox and chrome but only valid in IE

I've saw the API about jquery.ajax, and there is a param "isLocal", I don't know why it needs a MAP  ! how?