javascript - 在异步函数中使用 setTimeout

Question

这个问题在这里已经有了答案:





Combination of async function + await + setTimeout

(15 个回答)


7 天前关闭。




我有一个异步函数，它在继续之前等待 axios 调用完成。问题是我需要将 axios 调用的超时设置为半秒，这样我就不会达到 shopify API 调用限制。

async function processMatchingSchools(customer_metafield_url) {
  for (const item of customer_metafield_url) {
    await axios.get(item).then((res) => {
      for (key in res.data.metafields) {
        if (res.data.metafields[key].value === schoolName) {
          id_for_each_student.push(shopifyAdmin + "/customers/" + res.data.metafields[key].owner_id + "/metafields.json")
        }
      }
    })
  }
  console.log("Customer metafields to search", id_for_each_student)
  processOwnerIds(id_for_each_student)
}

当我尝试设置 setTimeout 时，它会调用 setTimeout 并在完成 axios 调用之前继续前进。

async function processMatchingSchools(customer_metafield_url) {
  for (const item of customer_metafield_url) {
    await setTimeout(function(item) {
      axios.get(item).then((res) => {
        for (key in res.data.metafields) {
          if (res.data.metafields[key].value === schoolName) {
            id_for_each_student.push(shopifyAdmin + "/customers/" + res.data.metafields[key].owner_id + "/metafields.json")
          }
        }
      })
    }, 500)
  }
  console.log("Customer metafields to search", id_for_each_student)
  processOwnerIds(id_for_each_student)
}

有什么帮助吗？

Answer 1

await仅适用于 promise 。
您需要包装 setTimeout在 promise 中:

const waitFor = delay => new Promise(resolve => setTimeout(resolve, delay));

await waitFor(500);