<div id="fb-root"></div><script>
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=223245147771570";
fjs.parentNode.insertBefore(js, fjs);}
(document, 'script', 'facebook-jssdk'));
FB.Event.subscribe('edge.create',
function(response) {
alert('You liked the URL: ' + response);
});</script>
<h1>Lajknout stranku!</h1>
<div class="fb-like" data-href="https://www.facebook.com/Testra22" data-send="false" data-layout="button_count" data-width="10" data-show-faces="false" data-font="trebuchet ms"></div>
我使用此代码创建 FB Like 按钮,我想在用户单击它时显示警报。但是有js错误Uncaught ReferenceError: FB is not defined。