// /work/coding/githubbuild/my-bfe-awesome/test.js
console.log(__dirname);
// /work/coding/githubbuild/my-bfe-awesome
console.log(__filename);
// /work/coding/githubbuild/my-bfe-awesome/test.js

  npm install pm2 -g
  // 进程间通信模块保证日志正常打印 pm2 安装模块依赖 git
  pm2 install pm2-intercom

 // package.json 里 scripts 的配置
    "pm2": "pm2 start ./config/ecosystem.config.js --env production",

// config/ecosystem.config.js
module.exports = {
  /**
   * Application configuration section
   * http://pm2.keymetrics.io/docs/usage/application-declaration/
   */
  apps: [
    // First application
    {
      name: "",
      script: "./bin/www",
      watch: true,
      ignore_watch: [
        // 从监控目录中排除
        "node_modules",
        "logs",
        "public",
        ".idea",
        ".git",
      ],
      watch_options: {
        followSymlinks: false,
      },
      error_file: "./logs/pm2/app-err.log", // 错误日志路径
      out_file: "./logs/pm2/app-out.log", // 普通日志路径
      instances: 2,
      // instance_var: "NODE_APP_INSTANCE",
      exec_mode: "cluster", // 集群模式 负载均衡
      env: {
        COMMON_VARIABLE: "true",
      },
      env_production: {
        NODE_ENV: "production",
      },
      env_dev: {
        NODE_ENV: "dev",
      },
      env_test: {
        NODE_ENV: "test",
      },
    },
  ],
};

var htmlSTring =
  "<div>\
  This is a string.\
</div>";