JavaScript-如何仅运行setInterval（）1次

Question

<button onClick="increase = setInterval(increasing, 400);
        clearInterval(decrease);"><b>Sicaklik Arttir (+)</b>
</button>

<button onClick="clearInterval(increase);
        clearInterval(decrease);"><b>Stop</b
</button>

<button onClick="decrease = setInterval(decreasing, 400);
        clearInterval(increase)"><b>Sicaklik Azalt  (-)</b>
</button>

I have buttons that include setInterval . When I press button, setInterval is called, but when I press again, setInterval is called again, and I can't stop it.

How do I stop it?

I want to run setInterval only one time.

Answer 1

There is setTimeout method which calls only once at a time.

setTimeout(increasing, 400)

To clear the timeout use clearTimeout method.

Answer 2

Check the return value before button clicked 2nd time and before timeout of 400 seconds ,

 if(! increase)
   increase = setTimeout(increasing, 400);

Then clear timeout :

 clearTimeout(increase);