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當用戶在點擊關鍵按鈕時成功登錄Google+後，我需要回撥事件。Google +的回撥按鈕+關注按鈕
此代碼是不給任何響應回調：
<!DOCTYPE html>
<html lang="en">
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="https://apis.google.com/js/platform.js?onload=onLoadCallback" async defer></script>
<script>
function plusClick(data) {
//Nothing working
}
</script>
</head>
<body>
<div class="g-follow" data-annotation="bubble" data-onstartinteraction="tester" data-callback="plusClick" data-height="20" data-href="//plus.google.com/u/0/115175605005410528191" data-rel="author"></div>
</body>
</html>