我有简单的phpmyadmin、mysql容器。
我在nodejs中创建了一个带有backend的新文件夹。现在，我无法通过backend连接到database。
所有三个容器（phpmyadmin，mysql，api）都工作并启动。但容器api不与数据库连接。
这是我用于连接的主db.js文件，它总是抛出错误。

const mysql = require("mysql");

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
    port: 8899,
});

db.connect((err) => {
    if (err) {
        throw new Error("Something went wrong!"); //  Get error always in this line because can't connect to db
    }
});

module.exports = db;

phpmyadmin的网址是localhost:8899。Phpmyadmin如我所期望的那样工作。没有任何错误。我可以通过docker-compose中的登录名和密码登录到数据库。但无法连接到后端。
和docker-compose.yml文件

version: "3"

services:
  phpmyadmin: 
    image: phpmyadmin/phpmyadmin
    container_name: phpmyadmin1
    environment: 
      - PMA_ARBITRARY=1
      - PMA_HOST=db
      - PMA_PORT=3306
    restart: always
    links:
      - db
    ports: 
      - 8899:80
    depends_on:
      - db

  api:
    build: ./api
    container_name: api1
    command: npm run start
    restart: unless-stopped
    ports:
      - "3005:3005"
    environment: 
      - PORT=3005
    depends_on:
      - phpmyadmin

  db: 
    image: mysql
    container_name: db
    environment:
      - MYSQL_ROOT_PASSWORD=my_secret_password
      - MYSQL_DATABASE=guess-game
      - MYSQL_USER=db_user
      - MYSQL_PASSWORD=db_user_pass
    restart: always
    ports: 
      - 6033:3306

我试着这样写：

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
});

就像这样

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
    port: 80,
});

或者

const db = mysql.createConnection({
    host: "localhost",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
    port: 6033, // DB port
});

偶数

const db = mysql.createConnection({
    host: "127.0.0.1",
    user: "db_user",
    password: "db_user_pass",
    database: "any-game",
});

请帮帮忙🙄