间隔太慢

Question

间隔不是每毫秒运行ning 一次。最后的数字只达到 459 就停止了。如果间隔上不止一条线，则更少。在这里它甚至没有经过前一千。我想要的是每秒运行一次，让我知道间隔完成了多长时间。所以如果 testNum 是 30，那么我知道它已经完成了 97% (2970/3000)。

let testNum = 3000
let testInt = setInterval(() => {
    testNum--
}, 1)
let testTimeout = setTimeout(() => {
    clearInterval(testInt)
    console.log('Final Number: ' + testNum)
}, 3000)

Answer 1

来自https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setInterval#Parameters：

delay

The time, in milliseconds (thousandths of a second), the timer should delay in between executions of the specified function or code. If this parameter is less than 10, a value of 10 is used.

也看看 Reasons for delays longer than specified。

间隔太慢

Interval is too slow

javascript

settimeout

setinterval