TypeScript 中对象字面量的类型定义 [英] Type definition in object literal in TypeScript

问题描述

在 TypeScript 类中，可以为属性声明类型，例如:

In TypeScript classes it's possible to declare types for properties, for example:

class className {
  property: string;
};

如何在对象字面量中声明属性的类型?

How do declare the type of a property in an object literal?

我尝试了以下代码，但无法编译:

I've tried the following code but it doesn't compile:

var obj = {
  property: string;
};

我收到以下错误:

名称字符串"在当前作用域中不存在

The name 'string' does not exist in the current scope

我做错了什么还是这是一个错误?

Am I doing something wrong or is this a bug?

推荐答案

您已经很接近了，您只需要将 = 替换为 :.您可以使用对象类型文字(请参阅规范第 3.5.3 节)或接口.使用对象类型文字与您所拥有的很接近:

You're pretty close, you just need to replace the = with a :. You can use an object type literal (see spec section 3.5.3) or an interface. Using an object type literal is close to what you have:

var obj: { property: string; } = { property: "foo" };

但你也可以使用接口

interface MyObjLayout {
    property: string;
}

var obj: MyObjLayout = { property: "foo" };

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