how call function in javascript code example

Example 1: javascript function call with variable

function abc() {
  alert('test');
}

var funcName = 'abc';

window[funcName]();

Example 2: call function javascript

// Define your function
function sayHello(msg){
	console.log("Hello, " + msg);
}

// Call it
sayHello("Norris");

// outputs:
// Hello, Norris