在 Promise Typescript 中获取一个值
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Get a value inside a Promise Typescript
提问by Rjk
One of function inside a typescript class returns a Promise<string>. How do I unwrap/yield the value inside that promise.
打字稿类中的一个函数返回一个Promise<string>. 我如何解开/产生该承诺中的价值。
functionA(): Promise<string> {
// api call returns Promise<string>
}
functionB(): string {
return this.functionA() // how to unwrap the value inside this promise
}
回答by basarat
How do I unwrap/yield the value inside that promise
我如何解开/产生该承诺中的价值
You can do it with async/await.Don't be fooled into thinking that you just went from async to sync, async await it is just a wrapper around .then.
你可以用async/await来做。不要误以为你只是从异步到同步，异步等待它只是一个包装器.then。
functionA(): Promise<string> {
// api call returns Promise<string>
}
async functionB(): Promise<string> {
const value = await this.functionA() // how to unwrap the value inside this promise
return value;
}
Further
更远
回答by Suren Srapyan
Try this
试试这个
functionB(): string {
return this.functionA().then(value => ... );
}
