subtitleClick

<h1>Please click on the subtitle</h1>
<script>
document.addEventListener('subtitleClick', function(e) {
  alert('subtitle clicked')
}, false);

function ready(callback) {
  // Invoke directly if JSBridge is already injected
  if (window.AlipayJSBridge) {
    callback && callback();
  } else {
    // Otherwise listen to `AlipayJSBridgeReady` event
    document.addEventListener('AlipayJSBridgeReady', callback, false);
  }
}
ready(function() {
  AlipayJSBridge.call('setTitle', {
    title: 'title',
    subtitle: 'subtitle'
  });
});
</script>