# Timer
## Module to Import
None
## Permission List
None
## setTimeout\(handler\[, delay\[, ...args\]\]\)
Sets a timer for the system to call a function after the timer goes off.
- Parameters
Name
Type
Mandatory
Description
handler
Function
Yes
Function to be called after the timer goes off.
delay
number
No
Number of milliseconds delayed before the execution. If this parameter is left empty, the default value 0 is used, which means that the execution starts immediately or as soon as possible.
...args
Array<any>
No
Additional parameter to pass to the handler after the timer goes off.
- Return Value
**timeoutID**: timer ID
- Example
```
var timeoutID = setTimeout(function() {
console.log('delay 1s');
}, 1000);
```
## clearTimeout\(timeoutID\)
Cancels the timer created via **setTimeout\(\)**.
- Parameter
Name
Type
Mandatory
Description
timeoutID
number
Yes
ID of the timer to cancel, which is returned by setTimeout()
- Example
```
var timeoutID = setTimeout(function() {
console.log('do after 1s delay.');
}, 1000);
clearTimeout(timeoutID);
```
## setInterval\(handler\[, delay\[, ...args\]\]\)
Sets a repeating timer for the system to repeatedly call a function at a fixed interval.
- Parameters
Name
Type
Mandatory
Description
handler
Function
Yes
Function to be called repeatedly
delay
number
No
Number of milliseconds delayed before the execution
...args
Array<any>
No
Additional parameter to pass to the handler after the timer goes off
- Return Value
**intervalID**: ID of the repeating timer
- Example
```
var intervalID = setInterval(function() {
console.log('do very 1s.');
}, 1000);
```
## clearInterval\(intervalID\)
Cancels the repeating timer set via **setInterval\(\)**.
- Parameter
Name
Type
Mandatory
Description
intervalID
number
Yes
ID of the repeating timer to cancel, which is returned by setInterval().
- Example
```
var intervalID = setInterval(function() {
console.log('do very 1s.');
}, 1000);
clearInterval(intervalID);
```