angular-observable

问题 I'm migrating an Angular 5 app to the latest CLI and Angular 6 RC and all of my Observable imports are broken. I see that Angular 6 changes the way the imports work, but I can't find any definite reference as to how the syntax works. I had this in 5 and it worked fine: import { Observable } from 'rxjs/Observable'; import 'rxjs/add/operator/map'; import 'rxjs/add/operator/catch'; import 'rxjs/add/observable/throw'; Now with the new syntax I see that import { Observable, Subject, throwError}

问题 I am retrieving the moved element top and left values and displaying it within the element, the issue is the top, left values of the current moved element modifies the span text top,left of all the elements. Note : It modifies the span text(top,left values) of all the elements which I dont want . The top,left positions per say of element are correct that is not getting affected. html <div (mousemove)="documentMouseMove($event)" #parentparent> <div id="toget" class="dropzone"> <div class="box"

问题 Can someone please explain the difference between Promise and Observable in Angular? An example on each would be helpful in understanding both the cases. In what scenario can we use each case? 回答1: Promise A Promise handles a single event when an async operation completes or fails. Note: There are Promise libraries out there that support cancellation, but ES6 Promise doesn't so far. Observable An Observable is like a Stream (in many languages) and allows to pass zero or more events where the