---
description: 🚧 施工中
---

# JS engine

[JS](../..) ⟩ [concepts](../../../browser/concepts) ⟩ [environment]() ⟩ JS engine

{% hint style="info" %}
🚧
{% endhint %}

{% tabs %}
{% tab title="🔴 主題" %}
* [mode](js-engine/mode "mention")
  * [strict-mode](js-engine/mode/strict-mode "mention") / [sloppy-mode](js-engine/mode/sloppy-mode "mention")
* <mark style="color:yellow;">**engines**</mark>
  * [v8](js-engine/v8 "mention")
{% endtab %}

{% tab title="⭐️ 重點" %}
{% hint style="info" %}
[v8](js-engine/v8 "mention")

* is a <mark style="color:purple;">**JS engine**</mark> used in <mark style="color:yellow;">**Chrome**</mark> / [node.js](node.js "mention").
* behaves <mark style="color:red;">**contrary**</mark> to the <mark style="color:yellow;">**spec**</mark> in [function-in-block-fib](../../val/func/declare/function-in-block-fib "mention"):exclamation:
{% endhint %}
{% endtab %}
{% endtabs %}
