页面加载时自动加载弹出窗口

I have just purchased a website template which included 'Sweet Alerts'.

On the template you have to click a button to show the pop up alert, see below code

 <button id="sweet-3" type="button" class="btn btn-raised btn-success">Launch alert</button>

Is it possible to load this when the page loads?

Base on 'Sweet Alerts' documentation (http://t4t5.github.io/sweetalert/) you could simply do something like this:

<body onload="sweetAlert('Test', 'Hello world', 'error');">
 <button id="sweet-3" type="button" class="btn btn-raised btn-success">Launch alert</button>
</body>
document.ready(function{
$('#sweet-3').trigger('click');
});

Quick and dirty

$( document ).ready(function() {
  $('#sweet-3').click();
});