setInterval()
Repeatedly calls a function with a fixed delay between each call.
Syntax
setInterval(callback, delay, ...args)
Returns
number — A timer id that can be passed to `clearInterval()`.
Examples
let n = 0;
const id = setInterval(() => {
n++;
console.log(n);
if (n === 3) clearInterval(id);
}, 10);
Output
1
2
3
Notes
- Always clear the interval with `clearInterval()` to stop it.
- If callbacks take longer than the interval, they may run back to back
without idle time.
- For animations prefer `requestAnimationFrame()`.
Browser & runtime support
| Environment | Since version |
|---|---|
| chrome | 1.0 |
| firefox | 1.0 |
| safari | 1.0 |
| edge | 12 |
| node | 0.10 |