📜'use strict'

JS ⟩ grammar ⟩ directive ⟩ 'use strict'

(directive) indicate the code that follows is strict mode, can appear only at the start of a script / function body.

'use strict';    // enters strict mode

👥 相關

• strict mode

📗 參考

• JavaScript: The Definitive Guide ⟩ 5.6.3 "use strict"

📘 手冊

• Strict mode