类似FaceBook的按钮回调不起作用

有人能告诉我为什么回调不适用于下面给出的类似按钮代码吗？据我所见，该代码是用JavaScript设置的标准代码。初始化第一个按钮，然后异步加载API，并提供回调函数。

<div id="fb-root"></div>
<script>
window.fbAsyncInit=function(){
    FB.init({
        appId:'',//App ID
        status:false,// check login status
        cookie:true,// enable cookies to allow the server to access the session
        xfbml:true// parse XFBML
    });
    // Additional initialization code here
    FB.Event.subscribe('edge.create', function(response) {
        //alert("user_id1:<?php echo $user_id1; ?>, user_id2:<?php echo $user_id2; ?>");
        /*var data={
            action:"ap_buttons_give_points",
            author_id:<?php echo $author_id; ?>,
            post_id:<?php echo $post_id; ?>,
            type:"like"
        }
        jQuery.post("<?php echo $ajax_url; ?>",data,function(resp){
        });*/
    alert('You just liked the page!');
});
    FB.Event.subscribe('edge.remove', function(response) {
        /*var data={
            action:"ap_buttons_take_points",
            author_id:<?php echo $author_id; ?>,
            post_id:<?php echo $post_id; ?>,
            type:"like"
        }
        jQuery.post("<?php echo $ajax_url; ?>",data,function(resp){
            //alert("fb remove:"+resp);
        });*/
    alert('You just unliked the page!');
});
};
// Load the SDK Asynchronously
(function(d){
    var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
    if (d.getElementById(id)) {return;}
    js = d.createElement('script'); js.id = id; js.async = true;
    js.src = "//connect.facebook.net/en_US/all.js";
    ref.parentNode.insertBefore(js, ref);
}(document));
</script>