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window.clearInterval() Method in Window Object of Javascript Syntax with Examples
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Usage 
The clearInterval() is used to clear interval which is mentioned in setinterval method.Example: If setinterval is used to display message at every particular time, then we can use clearinterval to stop display that particular message.
Syntax 
clearInterval(function);
Output
<button onclick="javascript:startIt();">Start</button>
<button onclick="javascript:stopIt();">Stop</button>

<input type="text" id="txt_current_time" size="50" />
var timer = null;
function doIt(){
  document.getElementById("txt_current_time").value = (new Date());
}

function startIt(){
   if (timer === null)
   timer = setInterval(doIt,1000);
}

function stopIt(){
   clearInterval(timer);
   timer = null;
}
Output 
It will display Start and Stop button.
Once you click start button, it will display time at every particular time interval in text box.

Sat Dec 06 2014 12:06:02 GMT+0530 (India Standard Time)

Once you click stop button, it will clear set values and stop the function.
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