call a function in jquery code example

Example 1: how to call function in jquery

$(document).ready(function() {
  $('#btnSun').click(myFunction);
});

function myFunction() {
  alert('hi');
}

Example 2: how do i call a js method?

<button onclick="sayHello()">say hello</button>  <script>    'use strict';  //force the context to be undefined    function sayHello() {      console.log(this);      console.log(arguments);      console.log('hello');    }  </script>