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window.setInterval() Method in Window Object of Javascript Syntax with Examples
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Usage 
The setInterval() method is used to display message or call function at specified interval of time.
Syntax 
setInterval(message or function,interval);
Syntax
function doIt(){
  document.body.innerHTML = "";
  document.write(new Date()+"<br />");
}

setInterval(doIt,1000);
Output 
It will display current time at every second.

"Sat Dec 06 2014 11:49:00 GMT+0530 (India Standard Time)"
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