how to do something when web page is loaded with javascript code example

Example 1: on load javascript

window.addEventListener('load', (event) => {
  console.log('page is fully loaded');
});

Example 2: call a function when page is loaded

<script src="js/jquery-1.11.0.min.js" type="text/javascript"></script>
<script type="text/javascript">

    $(document).ready(function () {
        yourFunction();
    });
    function yourFunction(){
      //some code
    }
</script>