我正在尝试在Node.js的循环内添加延迟。我有一个数组,需要为数组的每个元素调用一个函数。值得注意的是,每个这样的函数调用之间应该有30秒的间隔。这是我尝试过的-

const cprRedshift = async (page) => {
    let query = "select links from schema.table", links = [], ranks = []
    let data = await redshiftSelect(query)
    data.rows.forEach(element => {
        links.push(element.links)
    })

    let hostnames = await getDomainNames(links)

    // one way
    for(let i = 0; i < hostnames.length; i++){
            await setTimeout(async () => await checkPageRank(hostnames[i]), 30000)
    }

    // another way
    let i = 0
    while(i < hostnames.length){
        await checkPageRank(page, hostnames[i])
        setInterval(() => ++i, 30000)
    }
}


checkPageRank是同一脚本中的一个函数,我需要为hostnames []数组中的所有元素调用它,同时每次调用之间要保持30秒的间隔。关于如何实现这一点的任何想法将不胜感激。谢谢!

最佳答案

这是执行这种操作的通用模式的简化示例:



const hostnames = ["one", "two", "three", "four", "five", "six"];

function go (index = 0) {
  // do whatever you need to do for the current index.
  console.log(hostnames[index]);

  // if we haven't reached the end set a timeout
  // to call this function again with the next index.
  if (hostnames.length > index + 1) {
    setTimeout(() => go(index + 1), 1000);
  }
}

// kick it off
go();

09-18 15:48