即使设置了 env，redis 端口和主机仍未定义

Question

我正在使用 redis npm 包，每当我尝试连接它时，它都说 host 和 port 未定义。我打印出我的 process.env 对象，我可以看到 host 和 port 设置了值。只有当我将值传递到我的 Redis 模型 class 的构造函数时，它才变得未定义。有什么想法吗？

index.js

require('dotenv').config()


function startRedis() {
    const redisInstance = new Redis(
        process.env.REDIS_HOST,
        process.env.REDIS_PORT
    );
    
    redisInstance.init();
}



class Redis {
        constructor(redishost, redisport) {
            this.redishost = redishost;
            this.redisport = redisport;
        }
    
        async init() {
            try {
                this.redisClient = redis.createClient({
                    port: this.redisport, 
                    host: this.redishost
                });
                
            console.log("port: ", this.port)
            console.log("host: ", this.host)
    
            } catch(error) {
                console.log(`Error creating client due to: ${error}`)
            }
}

.env

REDIS_HOST="value here"
REDIS_PORT="port value here"

package.json

{
  "name": "app",
  "version": "0.0.1",
  "dependencies": {
    "redis": "^3.0.2",
    "dotenv": "^10.0.0"
  },
  "engines": {
    "node": ">=10.0.0"
  },
  "main": "index.js",
  "keywords": [],
  "author": "",
  "license": "ISC",
  "description": "",
  "devDependencies": {
    "redis": "^3.0.2",
    "dotenv": "^10.0.0"
  }
}

Update 1: 添加了我的 package.json

Answer 1

正如我在这里看到的，如果 process.env.REDIS_HOST 有价值。

你有新的class名字

你的启动函数应该是这样的


function startRedis() {
    const redisInstance = new Redis(
        process.env.REDIS_HOST,
        process.env.REDIS_PORT
    );
    
    redisInstance.init();
}

而你 console.log 错误的值


class Redis {
        constructor(redishost, redisport) {
            this.redishost = redishost;
            this.redisport = redisport;
        }
    
        async init() {
            try {
                this.redisClient = redis.createClient({
                    port: this.redisport, 
                    host: this.redishost
                });
                
            console.log("port: ", this.redisport)
            console.log("host: ", this.redishost)
    
            } catch(error) {
                console.log(`Error creating client due to: ${error}`)
            }
}

即使设置了 env，redis 端口和主机仍未定义

redis port and host undefined even though env are set

javascript

redis

node.js

npm

server