From e480acc35961e795711b5ca6d570ab282af21b9a Mon Sep 17 00:00:00 2001
From: EnochGao <enochgao@qq.com>
Date: Fri, 16 Dec 2022 16:52:55 +0800
Subject: [PATCH] feat: translate Indexed Access Types.md in zh-CN

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 .../Type Manipulation/Indexed Access Types.md | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 docs/documentation/zh/handbook-v2/Type Manipulation/Indexed Access Types.md

diff --git a/docs/documentation/zh/handbook-v2/Type Manipulation/Indexed Access Types.md b/docs/documentation/zh/handbook-v2/Type Manipulation/Indexed Access Types.md
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+---
+title: 索引访问类型
+layout: docs
+permalink: /zh/docs/handbook/2/indexed-access-types.html
+oneline: "使用 Type['a'] 语法来获取一个类型的子集"
+---
+
+我们可以使用 _索引访问类型_ 来查找另一种类型的特定属性:
+
+```ts twoslash
+type Person = { age: number; name: string; alive: boolean };
+type Age = Person["age"];
+//   ^?
+```
+
+被索引的类型本身也是一种类型，因此完全可以使用union、`keyof` 或其他类型：
+
+```ts twoslash
+type Person = { age: number; name: string; alive: boolean };
+// ---cut---
+type I1 = Person["age" | "name"];
+//   ^?
+
+type I2 = Person[keyof Person];
+//   ^?
+
+type AliveOrName = "alive" | "name";
+type I3 = Person[AliveOrName];
+//   ^?
+```
+
+如果你试图索引一个不存在的属性，甚至会看到一个错误：
+
+```ts twoslash
+// @errors: 2339
+type Person = { age: number; name: string; alive: boolean };
+// ---cut---
+type I1 = Person["alve"];
+```
+
+使用任意类型索引的另一个例子是使用 `number` 来获取数组元素的类型。我们可以将其与 `typeof` 结合使用，方便地获取数组字面量元素的类型：
+
+```ts twoslash
+const MyArray = [
+  { name: "Alice", age: 15 },
+  { name: "Bob", age: 23 },
+  { name: "Eve", age: 38 },
+];
+
+type Person = typeof MyArray[number];
+//   ^?
+type Age = typeof MyArray[number]["age"];
+//   ^?
+// Or
+type Age2 = Person["age"];
+//   ^?
+```
+
+索引只能作用类型上面，这意味着不能使用 `const` 来建立变量引用：
+```ts twoslash
+// @errors: 2538 2749
+type Person = { age: number; name: string; alive: boolean };
+// ---cut---
+const key = "age";
+type Age = Person[key];
+```
+
+不过，你可以使用类型别名进行类似的重构：
+
+```ts twoslash
+type Person = { age: number; name: string; alive: boolean };
+// ---cut---
+type key = "age";
+type Age = Person[key];
+```