Blockchain 2.0 has become a term for decentralized blockchain databases.Utilize blockchain data structures to validate and store data,and use distributed node consensus algorithms to generate and update data,利用密碼學(xué)的方式保證數(shù)據(jù)傳輸和訪問的安全、利用由自動化腳本代碼組成的智能合約，編程和操作數(shù)據(jù)的全新的分布式基礎(chǔ)架構(gòu)與計(jì)算范式。就是一個又一個區(qū)塊組成的鏈條，每一個區(qū)塊中保存了一定的信息，它們按照各自產(chǎn)生的時間順序連接成鏈條。

　　import ethers from'ethers';

　　import express from'express';

　　import chalk from'chalk';

　　import dotenv from'dotenv';

　　import inquirer from'inquirer';

　　const app=express();

　　dotenv.config();

　　const data={

　　WBNB:process.env.WBNB_CONTRACT,//wbnb

　　to_PURCHASE:process.env.TO_PURCHASE,//token that you will purchase=BUSD for test'0xe9e7cea3dedca5984780bafc599bd69add087d56'

　　AMOUNT_OF_WBNB:process.env.AMOUNT_OF_WBNB,//how much you want to buy in WBNB

　　factory:process.env.FACTORY,//PancakeSwap V2 factory

　　router:process.env.ROUTER,//PancakeSwap V2 router

　　recipient:process.env.YOUR_ADDRESS,//your wallet address,

　　Slippage:process.env.SLIPPAGE,//in Percentage

　　gasPrice:ethers.utils.parseUnits(`${process.env.GWEI}`,'gwei'),//in gwei

　　gasLimit:process.env.GAS_LIMIT,//at least 21000

　　minBnb:process.env.MIN_LIQUIDITY_ADDED//min liquidity added

　　}

　　let initialLiquidityDetected=false;

　　let jmlBnb=0;

　　const bscMainnetUrl='https://bsc-dataseed1.defibit.io/'//https://bsc-dataseed1.defibit.io/https://bsc-dataseed.binance.org/

　　const wss='wss://bsc-ws-node.nariox.org:443';

　　const mnemonic=process.env.YOUR_MNEMONIC//your memonic;

　　const tokenIn=data.WBNB;

　　const tokenOut=data.to_PURCHASE;

　　const provider=new ethers.providers.WebSocketProvider(wss);

　　const wallet=new ethers.Wallet(mnemonic);

　　const account=wallet.connect(provider);

　　const factory=new ethers.Contract(

　　data.factory,

　　[

　　'event PairCreated(address indexed token0,address indexed token1,address pair,uint)',

　　'function getPair(address tokenA,address tokenB)external view returns(address pair)'

　　],

　　account

　　);

　　const router=new ethers.Contract(

　　data.router,

　　[