Question

我有一个用例，在调用下一个函数之前，我需要在1-3秒之间进行随机延迟。

我尝试使用setTimeout方法，但是我不确定我在做什么是否正确

let timeInMs = Math.random() * (3000);
console.log('timeInMs => ', timeInMs);

setTimeout(test, timeInMs);

let test = async() => {
  console.log('called')
};

有人可以帮我解决用例吗？

Answer 1

将setTimeOut函数封装到Promise中，然后可以使用async / await语法对其进行调用：

const randomTimeInMs = Math.random() * (3000);

const functionToExecute = (delay) => console.log(`Ended after ${delay}`)

const executeLater = (functionToExecute, delay) => {
    return new Promise((resolve) => {
        setTimeout(() => {
            resolve(functionToExecute(delay))
        }, delay);
    });
}

// If you are in the entry file use following syntax. If you are already in an async function, just call `await executeLater()`
(async function() {
    await executeLater(functionToExecute, randomTimeInMs)
    console.log('Continue through this code after waiting...')
}());

Answer 2

尝试一下：

let timeInMs = Math.random() * (3000);
console.log('timeInMs => ', timeInMs);
let test = function (){
    console.log('called')
};
setTimeout(test,timeInMs);

对我来说正确！
是的！正确的方法是使用setTimeOut方法。

Answer 3

调用settimeout时，测试变量未定义。

使用函数语法，这将取决于函数范围

let timeInMs = Math.random() * (3000);
console.log('timeInMs => ', timeInMs);

setTimeout(test,timeInMs);

async function test(){
    console.log('called')
};

NodeJs：如何在1-3秒之间创建随机延迟？

3 个答案: