为什么JavaScript while循环在consol.log之前执行迭代器[关闭]

Question

我希望这段代码最多只能打印 10 个。但它最多可以打印 12 个。我可以修改代码来检查 i<10 instead of i<=10. But I do not understand why the while loop goes on to print 12. I know my logic is correct.

我希望下面的代码最多打印 10 个。但它最多打印 12 个。

let i=0;
while (i<=10){
    console.log(i);
    i+=2;
}

Answer 1

代码按预期工作。它不打印 12。 使用代码片段可以让您轻松验证代码。

let i=0;
while (i<=10){
    console.log(i);
    i+=2;
}

Answer 2

它最多打印 12，因为你设置了条件 i <= 10, i+=2. meaning as long as i is less than or equal to 10, it is going to add 2 to i. so if i is equal to 10, it is still going to add 2 to i. To achieve your desired result, i have update the code, see below:

let i = 0;
while (i <= 10) {
    i += 2;
    if (i > 10) {
        break;
    }
}