javascript

An example of the difference between interval and setTimeOut in javascript

SetTimeout (code,millisec) //- execute code after specified time

Code must be;

Millisec must;

ClearTimeout (setTimeoutId) //- cancel setTimeout()

SetInterval (code, millisec); // specifies that code is cycled in milliseconds

Code must be;

Millisec must;

ClearInterval (intervalId);

SetTimeout (code,millisec) can be used to achieve setInterval effect.

Below is a countdown page


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title> Headless document </title>
<script type="text/javascript">
var c=6;
var t;
function timedCount()
{
var time = document.getElementById('txt').value;
if( time>0){
document.getElementById('txt').value=c;
c=c-1;
t=setTimeout("timedCount()",1000);
}
else{
clearTimeout(t);
}

}
</script>
</head>
<body>
<form>
<input type="button" value=" Start the clock! " onClick="timedCount()">
<input type="text" id="txt" value="6">
</form>
</body>
</html>