仅将 xhr2 与 javascript 一起使用

Question

I'm trying to use xhr2, to read through a json file. I've looked up numerous ways to achieve this but none seem to be working. The function below my require statements is the function that I see most often. Ultimately what I wish to achieve is to make an array of objects by reading through multiple json files in order to fill a select order form on a website I am trying to create.

var http = require('http');
const ROOT = "./root_html";
var fs = require('fs');
var url = require('url');
var mime = require('mime');
//var XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
var XMLHttpRequest = require('xhr2');
var XMLHttpRequestUpload = XMLHttpRequest.XMLHttpRequestUpload;
//create the server
var server = http.createServer(handleRequest);

function readTextFile(file, callback) {
    var rawFile = new XMLHttpRequest();
    rawFile.overrideMimeType("application/json");
    rawFile.open("GET", file, false);
    rawFile.onreadystatechange = function() {
        if (rawFile.readyState === 4 && rawFile.status == "200") {
            callback(rawFile.responseText);
        }
    }
    rawFile.send(null);
}

//usage:
readTextFile("/civs/specials.json", function(text){
    var data = JSON.parse(text);
    console.log(data);
});

I continue to get an error and am having an awfully hard time trying to find any information regarding why this error is occurring.

C:\cygwin64\home\User\node_modules\xhr2\lib\xhr2.js:205
          throw new NetworkError("Unsupported protocol " + this._url.protocol);

Answer 1

You may don't have a running server in your local computer. To run the server in the local computer:

(1) Open Terminal
(2) cd <designated folder>
(3) http-server
(4) Modify the file location related to the "designated folder" in JS file
ex) "http://localhost:8080/<related folder>/<JSON file>"
(5) Open another Terminal
(6) node <JS file>

Answer 2

1. npm i xmlhttprequest
2. var XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
3. var xhr = new XMLHttpRequest();

It's work in my code