如何从FB.api返回的对象中读取属性数据？

<script>
    window.fbAsyncInit = function () {
        FB.init({ appId: \'<myAppId>\', status: true, cookie: true, xfbml: true });
        FB.Event.subscribe(\'comment.create\', function () {
            FB.api(\'/comments/?ids=http://foo.com\', function (response) {
                console.log(response);
            });
        });
    };
    (function () {
        var e = document.createElement(\'script\'); e.async = true;
        e.src = document.location.protocol + \'//connect.facebook.net/en_US/all.js\';
        document.getElementById(\'fb-root\').appendChild(e);
    } ());
</script>

{
    \"http://foo.com\": {
       \"data\": [
          {
             \"id\": \"10150090820621770_15631060\",
             \"from\": {
                \"name\": \"Test User\",
                \"id\": \"1234455\"
             },
             \"message\": \"testing\",
             \"created_time\": \"2011-04-18T01:55:38+0000\"
          },
          {
             \"id\": \"10150090820621770_15631066\",
             \"from\": {
                \"name\": \"Test UserToo\",
                \"id\": \"1149043581\"
             },
             \"message\": \"testing2\",
             \"created_time\": \"2011-04-18T01:56:12+0000\"
          }
       ]
    }
 }

response.data[0].from.name

undefined

response.data

response.data.length

response.data[0]