如何使用 JavaScript 编写文档然后下载文档？

Question

How can I write for example in a JSON or TXT file with JavaScript. After I write in the file how can I download it. Similar to doing this in python

File = open("FileToWriteIn.txt", "wb")
File.write("Hello")
File.close()
# Then I want to download the file which in this case would be FileToWriteIn.txt but I want to
# do this with JavaScript

Thanks.

Answer 1

For file saving take a look at FileSaver.js which provides a simple approach to save files. Writing to a text file will then look like this:

var blob = new Blob(["Hello, world!"], {type: "text/plain;charset=utf-8"});
FileSaver.saveAs(blob, "hello world.txt");

This will automatically open the download dialogue.

Answer 2

You can create Blobs,. Below is an example, I've placed the result inside an iFrame for this snippet, but you could use window.open instead if you wanted to download.

 //create blob const blob = new Blob([JSON.stringify( { hello: 'world' })], {type : 'application/json'}); //turn into a URL for download or view etc. const url = URL.createObjectURL(blob); //for testing, lets put in an iframe const frame = document.createElement('iframe'); frame.setAttribute('src',url); document.body.appendChild(frame);