The Imitation tutorial provides a countdown page with the following code:
1 <HTML> 2
However, an interesting phenomenon is found during running:
Because the above Code does not hide the input box and the countdown button after the countdown starts, this leads to a new countdown button if you do not click the new page after the countdown starts, the following countdown will start again, but the speed of the countdown will be twice the original speed, and the click will be twice the last time, and so on. It means that if you click the Start countdown button again without refreshing a new page, the countdown function is called twice in 1000 milliseconds;
About setinterval: What if you click the setinterval button again without refreshing the page?
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