typescript { [key: string]: boolean; type { [key: string]: boolean; } 意思？
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What does the type { [key: string]: boolean; } mean?
提问by Leonid Bor
Run into such thing lately, a function declaration:
最近遇到这样的事情，一个函数声明：
static required(control: AbstractControl): {
[key: string]: boolean;
};
What is this return value? An object with arbitrary amount of properties, where each of them is a boolean and has name, which appears to be string? It's more of a typescript question I guess, but just in case someone wonders where I found that - it's Angular's Validatorsclass.
这个返回值是什么？具有任意数量属性的对象，其中每个属性都是布尔值并具有名称，名称似乎是字符串？我猜这更像是一个打字稿问题，但以防万一有人想知道我在哪里找到的 - 这是 Angular 的Validators课程。
采纳答案by Leonardo Chaia
This is a key/value structure. The key is a stringand the value is a boolean. For example:
这是一个键/值结构。键是 a string，值是 a boolean。例如：
let map : { [key: string]: boolean} = {};
map["foo"] = true;
map["bar"] = false;
map.foo = true;
map["foobar"] = "foo"; // Throws exception
map[1] = true; // Curiously doesn't throws exception
Check this sample on the Typescript Playground.
