typescript 键值对声明的打字稿数组
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Typescript array of key value pairs declaration
提问by mishap
Confused about the following declaration:
对以下声明感到困惑：
constructor(controls: {[key: string]: AbstractControl}, optionals?: {[key: string]: boolean}, validator?: ValidatorFn, asyncValidator?: AsyncValidatorFn)
What is the type of the controls (first parameter)? Is it an object which is an array of key value pairs where key is string and value is AbstractControl? Thanks!
控件的类型是什么（第一个参数）？它是一个键值对数组的对象，其中键是字符串，值是 AbstractControl？谢谢！
回答by Nitzan Tomer
Yes, like you guessed, it's a js object with key as string and AbstractControlas values.
For example:
是的，就像你猜的那样，它是一个 js 对象，键作为字符串和AbstractControl值。
例如：
{
"control1": new Control(),
"control2": new Control()
}
Edit
编辑
You can declare a variable to be of this type in two ways:
您可以通过两种方式将变量声明为这种类型：
let controls: { [key: string]: AbstractControl };
or
或者
interface ControlsMap {
[key: string]: AbstractControl;
}
let controls: ControlsMap;
or even better:
甚至更好：
interface ControlsMap<T extends AbstractControl> {
[key: string]: T;
}
let controls1: ControlsMap<AbstractControl>;
let controls2: ControlsMap<MyControl>;
