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並前往https://www.quora.com/How-can-I-wait-until-my-http-request-finishes-in-Angular-2-4-or-5-so-that-I-dont-get-undefined-back

How to wait until my http request finishes in Angular 2,4, or 5 ...

You can use toPromise Function from rxjs and convert the http request to a promise then use async/await in your component to wait for result.

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