js example on click a button

Example 1: button click function in js

<script>
  $(document).ready(function(){
    $('#MyButton').click(function(){
       CapacityChart();
    });
  });
</script>

<input type="button" value="Capacity Chart" id="MyButton" >

Example 2: how to create click function in javascript

var x = document.getElementById('container');
//click can also be antother event
x.addEventListener('click', function (x) {
  console.log('hi');
});