How to time an event in javascript?

JavaScript Timing Events
To time events in JavaScript use the following 2 methods
1.setInterval() :This method will wait for a specific time and then execute the specified function and will continue to execute the function for every time interval.
This is the syntax used : setInterval("javascript function",milliseconds);
to Stop the Execution use the clearInterval() method with the following syntax :
clearInterval(intervalVariable)
2.setTimeout() - : this method will wait for a specific time and then executes the specified function
This is the syntax used:
setTimeout("javascript function",milliseconds);
and again to stop the execution use the clearTimeout() method