[英]node.js process.env not working in command line
我正在參加關於從頭開始編寫區塊鏈的在線課程。 本課程使用 javascript 和 node.js。 我對這些技術非常陌生,但到目前為止,我一直遵循 T 的課程。我正在粘貼相關代碼 - 應用程序文件(索引):
const express = require('express');
const bodyParser = require('body-parser');
const Blockchain = require('../blockchain');
const P2pServer = require('./p2p-server');
const HTTP_PORT = process.env.HTTP_PORT || 3001;
const app = express();
const bc = new Blockchain();
const p2pServer = new P2pServer(bc);
app.use(bodyParser.json());
app.get('/blocks', (req, res) => {
res.json(bc.chain);
});
app.post('/mine', (req, res) => {
const block = bc.addBlock(req.body.data);
console.log(`New blovk added: ${block.toString()}`);
res.redirect('/blocks');
});
app.listen(HTTP_PORT, () => console.log(`Listening on port ${HTTP_PORT}`));
p2pServer.listen();
以及來自 p2p-server.js 的代碼:
const Websocket = require('ws');
const P2P_PORT = process.env.P2P_PORT || 5001;
const peers = process.env.PEERS ? process.env.PEERS.split(',') : [];
//HTTP_PORT=3002 P2P_PORT=5003 PEERS=ws://localhost:5001 npm run dev
class P2pServer {
constructor(blockchain) {
this.blockchain = blockchain;
this.sockets = [];
}
listen() {
const server = new Websocket.Server({ port: P2P_PORT });
server.on('connection', socket =>this.connectSocket(socket));
this.connectToPeers();
console.log(`listening to peer-to-peer connections on: ${P2P_PORT}`);
}
connectToPeers() {
peers.forEach(peer => {
const socket = new Websocket(peer);
socket.on('open', () => this.connectSocket(socket));
});
}
connectSocket(socket){
this.sockets.push(socket);
console.log('socket connected');
}
}
module.exports = P2pServer;
當我嘗試在命令行中運行以下命令時:
HTTP_PORT=3002 P2P_PORT=5003 PEERS=ws://localhost:5001 npm run dev
我得到以下信息:
'HTTP_PORT' is not recognized as an internal or external command, operable program or batch file.
由於某種原因, process.env 沒有接收輸入並將其傳遞給應用程序。 這里有什么問題? 謝謝!
編輯:我被要求添加package.json
:
{
"name": "sf-chain",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "jest --watchAll",
"dev-test": "nodemon dev-test",
"start": "node ./app",
"dev": "nodemon ./app"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"jest": "^23.1.0",
"nodemon": "^1.17.5"
},
"dependencies": {
"body-parser": "^1.18.3",
"crypto-js": "^3.1.9-1",
"express": "^4.16.3",
"ws": "^5.2.0"
}
}
您正在使用:
$ HTTP_PORT=3002 P2P_PORT=5003 PEERS=ws://localhost:5001 npm run dev
由於窗口Powershell無法識別此命令,因此顯示錯誤。
相反,您應該使用:
set HTTP_PORT=3002 && set P2P_PORT=5002 && set PEERS=ws://localhost:5001 && npm run dev
我相信正在做同樣的課程。 我相信你可能已經知道了,但我在 Git Bash 而不是 Powershell 中嘗試了相同的步驟,並且成功了。
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