call meathod javascript code example

Example 1: 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>

Example 2: js call and apply

func.call([thisArg[, arg1, arg2, ...argN]])