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JS Timer function: SetTimeout and SetInterval

Source: Internet
Author: User
Tags setinterval time interval
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The two htmldom elements can be interpreted as a function that is timed to execute so that we can run the specified code again at the specified time.

The difference between the two is one settimeout only executes once, setinterval Non-stop execution: Look at the following two:

SetTimeout

The settimeout () method is used to call a function or evaluate an expression after a specified number of milliseconds.
SetTimeout () executes only one code at a time. If you want to call more than once, use SetInterval () or let code itself call SetTimeout () again.

SetTimeout (CODE,MILLISEC)
Code required. The JavaScript code string to execute after the function to be invoked.
Millisec required. The number of milliseconds to wait before executing the code.

Example: 5 seconds after clicking the button pop-up dialog box

The code is as follows Copy Code

<script type= "Text/javascript" >
function timedmsg ()
{
var t=settimeout ("Alert (' 5 seconds! ')", 5000)
}
</script>

<body>
<form>
<input type= Button "value=" Displays the Timed message box! "OnClick =" timedmsg () >
</form>
<p> Click on the button above. A message box is displayed in 5 seconds. </p>
</body>


setinterval

The SetInterval () method can call a function or a calculation expression in the specified period (in milliseconds).
The SetInterval () method keeps calling the function until the clearinterval () is called or the window is closed. The ID value returned by SetInterval () can be used as an argument to the Clearinterval () method.
SetInterval (code,millisec[, "Lang"])
Code required. The function to invoke or the code string to execute.
Millisec must. The time interval, in milliseconds, between the periodic execution or invocation of code.

SetTimeout () executes only one code at a time. If you want to call more than once, use SetInterval () or let code itself call SetTimeout () again.

We write an example and keep updating the time:

The code is as follows Copy Code

<span id= "Timeinfo" >09:00</span>
<script type= "text/ JavaScript
Function Timegoon () {
    function getfullstr (i) {
         return i<10? " 0 "+I:I;
   }
    var today = new Date ();
    var h = getfullstr (Today.gethours ());      //Get the current number of hours (0-23)
    var m = getfullstr (Today.getminutes ());      //Get the current number of hours (0-23)
    var s = getfullstr (Today.getseconds ());    //Get current number of minutes (0-59)
     $ (' #timeinfo '). Text (h+ ': ' +m+ ': ' +s);
}
SetInterval (Timegoon,
</script>
 
</body>

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Related Keywords:
php timer function script jquery timer function example alarm clock and timer alarm clock and timer setinterval php js replace function php settimeout

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