javascript setinterval随机时间

Question

我有这个带有功能警报的setinterval:

setInterval(function(){
    alert('oo');
}, 5000);

但是我想在每次间隔运行alert()时改变我的(5000)间隔 - 我想在5-10秒之间随机选择它.知道怎么做吗？

Answer 1

你可以这样做：

function myFunction() {
  alert('oo');
  setTimeout(myFunction, Math.random() * 5000)
}

myFunction()

Answer 2

您可以使用两种方法来完成此操作，即第一setTimeout和第二requestAnimationFrame。

以下是两者的完整示例。

随机间隔setTimeout

function randomInterval(callback, min, max) {
    let timeout;

    const randomNum = (max, min = 0) => Math.random() * (max - min) + min;

    const stop = () => clearTimeout(timeout)

    const tick = () => {
        let time = randomNum(min, max);
        stop();

        timeout = setTimeout(() => {
            tick();
            callback && typeof callback === "function" && callback(stop);
        }, time)
    }

    tick();
}

随机间隔使用requestAnimationFrame

function randomInterval(callback, min, max) {
    const randomNum = (max, min = 0) => Math.random() * (max - min) + min;

    let targetTime = randomNum(min, max);
    let lastInvoke = performance.now();

    const stop = () => targetTime = null

    const tick = () => {
        if (!targetTime) return;

        if (performance.now() - lastInvoke > targetTime) {
            lastInvoke = performance.now();
            targetTime = randomNum(min, max);
            callback && typeof callback === "function" && callback(stop);
        }

        requestAnimationFrame(tick)
    }

    tick();
}

这是如何调用它的示例

randomInterval((stop) => {
    // do what you want...

    if (stopCondition) {
        stop();
    }
}, 1000, 3000)

Answer 3

您应该使用setTimeout设置执行函数的时间间隔.

function myFunction() {
  var min = 5,
    max = 10;
  var rand = Math.floor(Math.random() * (max - min + 1) + min); //Generate Random number between 5 - 10
  alert('Wait for ' + rand + ' seconds');
  setTimeout(myFunction, rand * 1000);
}

myFunction()