为什么我的IF语句不执行？ 为什么即使我插入clearStatement调用，间隔仍继续运行

Question

The If statement is not being executed. I dont understand why?

the only way I can clear the interval is if I print the command myself without the any if statements.

var number = 0;

function addThis(){
  return number +=1;
}

var mySID = setInterval(addThis, 1000); 

if(number === 10){
  clearInterval(mySID);
  number;
}

Answer 1

It is running; it's just not evaluating to true, so the "then" doesn't run. Your if statement runs immediately after the call to setInterval , so number is still 0. It won't be 10 for another 10 seconds, but by then the if statement has long since finished.