fetch()调用不返回任何数据 [英] fetch() call not returning any data

问题描述

我的fetch()调用有问题，无法正常工作.我有一个在此函数中调用自身的递归方法，但是一旦它传递了if语句，则数据本身不会被解析为下面的.then()调用.我想将递归方法保留在此函数内.因为此函数正在调用的系统会将data.result更改为另一个不为null的结果.我只是不知道什么时候会发生，所以这就是为什么我使用递归方法.

I'm having a problem with my fetch() call not working correctly. I have a recursion method that calls itself within this function, but once it passes the if statement, the data itself is not being resolved to the .then() call below. I would like to keep the recursion method within this function. Because the system that this function is calling will change the data.result to a different result that is not null. I just don't know when that will happen, hence that is why I'm using the recursion method.

var someToken = "actually token";

function getResult(getToken) {
  return new Promise((resolve, reject) => {
    fetch(url, {
      headers: {
        "Authorization": something,
        "Jenkins-Crumb": getToken
      },
      redirect: 'follow',

    }).then(response => {
      return response.json()

    }).then(data => {

      if (data.result == null) {
        console.log('retrieving data')
        getResult(getToken)
      } else if (data.result == "SUCCESS") {
        console.log('success')
        resolve(data)
      }

    }).catch(err => {
      reject(err)
    })
  })
}

getResult(someToken).then(data => {
  console.log(data)
}).catch(err => console.log(err))

推荐答案

尝试使用 async ... await ，您的代码会简单得多

try using async...await and your code will be much simpler

var someToken = "actually token";

async function getResult(getToken) {
  const resp = await fetch(url, {
    headers: {
      "Authorization": something,
      "Jenkins-Crumb": getToken
    },
    redirect: 'follow',
  });
  const data = await resp.json();
  if (data.result == null) {
    console.log('retrieving data')
    return getResult(getToken)
  } else if (data.result == "SUCCESS") {
    console.log('success')
    return data;
  }
}

getResult(someToken).then(data => {
  console.log(data)
}).catch(err => console.log(err))

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