how .call() method works in javascript code example

Example 1: javscript call

myFunc.call(thisArg, ...args)

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>