🔰global variable

a var/let/const in global scope.

JS ⟩ scope ⟩ global ⟩ variable

a var/ let / const variable declared in the global scope.

⭐️ 重點

• global object property is also exposed as global variable.

• global variables do get created by declaring variables in the global scope.

👉 global var / function is global object property❗️❗

global variables don't get created by declaring variables in the top-level scope of a module (module scope).

DOM element with "id" is automatically registerd as global variable/global object property.

🔴 主題

• accidental global variable in sloppy mode❗️

• global var

  • global var / function is global object property❗️❗

• global let

  • global let shadows global object property❗

👥 相關

• accidental global variable in sloppy mode❗️