Alert "Hello" every 3 seconds, 3000 milliseconds:
setInterval(function(){ alert("Hello"); }, 3000);
Click the button to wait 3 seconds, then alert "Hello".
<!DOCTYPE html> <html> <body> <button onclick="myFunction()">Test</button> <script> function myFunction() {/*from w ww .jav a2 s .co m*/ setInterval(function(){ alert("Hello"); }, 3000); } </script> </body> </html>
The setInterval() method calls a function an expression at specified intervals in milliseconds.
The setInterval() method will continue calling the function until clearInterval() is called, or the window is closed.
The ID value returned by setInterval() is used as the parameter for the clearInterval() method.
To execute a function only once, after a specified number of milliseconds, use the setTimeout() method.
setInterval(function, milliseconds,param1, param2, ... );
Parameter Values
| Parameter | Description |
|---|---|
| function | Required. The function that will be executed |
| milliseconds | Required. The intervals in milliseconds on how often to execute the code. If the value is less than 10, the value 10 is used |
| param1, param2, ... | Optional. Additional parameters to pass to the function |
The setInterval() method returns a Number representing the ID value of the timer that is set.
Use this value with the clearInterval() method to cancel the timer