javascript

Introduction and application of js setTimeout of function take countdown as an example

Definition and usage:

The setTimeout() method is used to call a function or evaluate an expression after a specified number of milliseconds.

Grammar:

SetTimeout (code, millisec)

Parameters:

Code (required) : a string of JavaScript code to be executed after the function to be called. Millisec (required) : number of milliseconds to wait before executing the code.

Tip:

SetTimeout () executes code only once. If you want to make multiple calls, use setInterval() or have the code itself call setTimeout() again.

For example:


<script language="javascript">
function timer(){

var value=Number(document.all['time'].value);
if (value>1) document.all['time'].value=value-1;
else {
document.all['time'].value=" Agreed to ";
return false;
}
window.setTimeout("timer()",1000);

}
</script>
<body onload="timer()">
<input name="time" value="10" type="button" style="width:40px;" />
</body>