🔸global object property

🚧 under construction

JS ⟩ scope ⟩ global ⟩ global object ⟩ property

property of the global object.

⭐️ 重點

read-only global object property❗

• NaN/Infinity/ undefined

global variable/function as global object property

• global var / function is implemented as global object property❗

• these properties cannot be deleted with delete❗

• global let / const is not global object property❗

👉 global var / function is global object property❗️

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

🔴 主題

• global object properties

  • in general： undefined/ NaN / Infinity ...

  • in browser： window.name / DOM element with "id"

• general topics

  • global let shadows global object property

  • global var / function is global object property❗️

  • accidental global variable in sloppy mode❗️

🚧

• NaN

• Infinity