In JavaScript a piece of code can be executed at specified time interval. For example, you can call a specific JavaScript function every 1 second. This concept in JavaScript is called timing events. The global window object has the following 2 methods that allow us to execute a piece of JavaScript code at specified time intervals. setInterval(func, delay) - Executes a specified function, repeatedly at specified time interval. This method has 2 parameters. The func parameter specifies the name of the function to execute.