JavaScript中的承诺/提取:如何从文本文件中提取文本 [英] Promises/Fetch in JavaScript: how to extract text from text file

问题描述

我正在使用JavaScript编写一个小程序.基本上，我想使用Promise和fetch从两个文本文件中提取文本.但是，我不知道如何从文件中获取实际的文本.这是我当前的代码.

I'm working on a small program in JavaScript. Basically, I want to use Promise and fetch to extract text out of two text files. However, I can't figure out how to get the actual text out of the files. Here's my current code.

sample.txt

sample.txt

this is
a sample
text file.

sample2.txt

sample2.txt

this is
the second
sample file.

index.js

function getSampleText() {

  Promise.all([
  fetch('sample.txt'),
  fetch('sample2.txt')
  ]).then(allResp => {
    let sampleResp = allResp[0];
    let sample2Resp = allResp[1];
    console.log(sampleResp);
    console.log(sample2Resp);
  })
}

这是应许...我该如何从中获取文字?

Here are the Promises...how do I get the text out of these?

推荐答案

Fetch不会为响应文本返回承诺-在标头包含后，它会返回对 Response 对象可用的承诺已收到.

Fetch doesn't return a promise for the text of a response - it returns a promise for a Response object available after headers have been received.

这样您就可以做一些很酷的事情，例如:

This is so you can do cool things like:

• 根据标题确定如何读取响应的正文.
• 逐步发送响应等.

如果您想要响应的文本-您可以 .text() Response 对象来获得承诺:

If you want the text of the response - you can .text() the Response objects to get a promise for that:

Promise.all([
  fetch('sample.txt').then(x => x.text()),
  fetch('sample2.txt').then(x => x.text())
]).then(([sampleResp, sample2Resp]) => {
  console.log(sampleResp);
  console.log(sample2Resp);
});

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