setTimeout in JavaScript
setTimeout: The global setTimeout() method sets a timer which executes a function or specified piece of code once the timer expires.
Syntax: setTimeout(callbackFunction, delay)
Return value : It returns a integer id and it is used with clearTimeout() for preventing function from start.
Important points related to setTimeout
(1). It execute only once.
(2). It is asynchronous function.
(3). It is a part of Web API or window object.