aifengqi

const axios = {
    get(url, { headers = {} }) {
        return new Promise((resolve, reject) => {
            const xhr = window.XMLHttpRequest
                ? new XMLHttpRequest()
                : new ActiveXObject("Microsoft.XMLHTTP");

            xhr.open("get", url);
            xhr.withCredentials = true;
            // Object.entries(headers).forEach(([key,value]) => xhr.setRequestHeader(key, value));

aifengqi

// A blockchain is a distributed database for an append-only sequence of records.

It works like a log: new records are appended over time and linked together,
similar to a linked list.

Class DataBlock {
    getData();
    setData();
    getPre();
    getNext();

aifengqi

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
} 

aifengqi

package main

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"io"
	"log"
	"net/http"
	"os"