Problem Description:

When you run the code containing the return statement directly in the script tag or in the browser console, an error is reported:

SyntaxError: Illegal return statement

if (!NaN) {
	console.log('went into the conditional statement')
	return "Ollie gives!"
}

reason:

In JavaScript, the return statement can only be placed in the function, otherwise the following error will pop up.

SyntaxError: Illegal return statement

Solution:
package the modified code block in function.

(function () {
	if (!NaN) {
		console.log('went into the conditional statement')
	return "Ollie gives!"
	}
})()

// Run results 
It goes into the conditional statement
"Ollie gives!"