Strict mode - JavaScript | MDN

Note: Sometimes you'll see the default, non-strict mode referred to as sloppy mode. This isn't an official term, but be aware of it, just in case. JavaScript's strict mode is a way to opt in to a restricted variant of JavaScript, thereby implicitly opting-out of "sloppy mode". Strict mode isn't just a subset: it intentionally has different semantics from normal code. Strict mode code and non-stric

[theatrical]

[debug

[LaclefYoshi]

"use strict";と書かれたコードを最近よく見たので

[mooz]

strict mode の概要

[clairvy]

use strict

[Kanasansoft]

EcmaScript5で導入された、厳格モードの詳細。