showLoading

<h1>Please press the following buttons</h1>
<p>Please press back button to exit in Android platform</p>
<a href="javascript:void(0)" class="btn show">Show loading</a>
<a href="javascript:void(0)" class="btn delay">Display loading in 2 seconds</a>
<a href="javascript:void(0)" class="btn notext">Display spinner without text</a>

<script>
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() {
  document.querySelector('.show').addEventListener('click', function() {
    AlipayJSBridge.call('showLoading', {
      text: 'Loading',
    });
    setTimeout(function() {
      AlipayJSBridge.call('hideLoading');
    }, 3000);
  });

  document.querySelector('.delay').addEventListener('click', function() {
    AlipayJSBridge.call('showLoading', {
      text: 'Loading',
      delay: 2000,
    });
    setTimeout(function() {
      AlipayJSBridge.call('hideLoading');
    }, 5000);
  });

  document.querySelector('.notext').addEventListener('click', function() {
    AlipayJSBridge.call('showLoading', {
      text: ' ',
    });
    setTimeout(function() {
      AlipayJSBridge.call('hideLoading');
    }, 3000);
  });
});
</script>