An example of the difference between interval and setTimeOut in javascript

2020-03-30 02:23:29
OfStack

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>