✅always use strict mode

it's best practice to use "strict mode".

JS ⟩ concepts ⟩ strict mode ⟩ always use strict mode

in strict mode：

• ✅eval has its own scope in strict mode.

• ✅ no accidental global variable in sloppy mode❗️

• ✅ no deplicate parameters❗. ( 👉 more ... )

• ✅ can't delete variables/functions. ( 👉 more ... )

• ✅ no octal literals ( 👉 more ... )

👥 相關

• parameter

• eval

• global variable

📗 參考

• eval of strict mode code does not introduce new variables into the surrounding scope

• itHome ⟩ 你不可不知的 JavaScript 二三事 ⟩

  • #Day12：看 Strict Mode 如何施展「還我漂亮拳」(1)

📘 手冊

• Strict mode