🔰environment

🚧 施工中

JS ⟩ concepts ⟩ environment

JavaScript code can be run：

• in browser (client code)

• in web worker

• in Node.js (server code)

🔴 主題

• environments

  • browser (client code)

  • Node.js (server code)

  • web worker

  • JS engine

⭐️ 重點

global object in each environment：

• browser： window (a Window object)

• web worker： self (a WorkerGlobalScope object)

• Node.js： global (an object called global)

every environment exposes some of its own built-ins into the global scope：

• browser：console, DOM(including window), timers, web API

• web worker：??? (anything else?)

• Node.js：???

📗 參考

• YDKJS: Scope & Closures (v.2) ⟩ Chapter 4: Around the Global Scope

📘 手冊

• Global object

🚧

• console

• timers