the end of the array.functiondoSequence(observer,arr,idx){returnsetTimeout(()=>{observer.next(arr[idx]);if(idx===arr.length-1){observer.complete();}else{doSequence(observer,arr,idx++);}},1000);}// Create a new
创建Observable RxJS 中提供了很多操作符,用于创建 Observable 对象,常用的操作符如下: of(), 将普通JavaScript数据转为 Observable from(), 把数组或iterable对象转换成Observable create(), 返回一个可以在Observer上调用方法的Observable. fromEvent(), 把event转换成Observable. fromPromise(), 把Promise转换成Observa...
Create observable with constructor 代码语言:javascript 复制 content_copy// This function runs when subscribe() is calledfunction sequenceSubscriber(observer) { // synchronously deliver 1, 2, and 3, then complete observer.next(1); observer.next(2); observer.next(3); observer.complete(); // uns...
push.notification.service.ts的示例代码 import {Injectable} from '@angular/core';import { Observable} from 'rxjs/Observable';@Injectable()export class PushNotificationsService { public permission: Permission; constructor() { this.permission = this.isSupported() ? 'default' : 'denied'; ...
从promise创建一个Observable: Copy import{ fromPromise }from'rxjs';// Create an Observable out of a promiseconstdata =fromPromise(fetch('/api/endpoint'));// Subscribe to begin listening for async resultdata.subscribe({next(response) {console.log(response); },error(err) {console.error('Error:...
create - Observable构造函数 of - 列举有限的 range - 特定范围 generate - 循环 repeat - 重复 empty - 空 never - 永不完结 throw - 抛出错误 异步数据流 interval - 特定间隔 timer - 定时 from fromEvent ajax defer 编写代码时候,常常没有想到异步的存在,导致undefined异常发生。
| [](https://github.com/angular/angular/commit/87549af73c675d33b2c87d083e05a82b18332bf0) | Fix capitalization of toObservableOptions (#49832) | | [:ClassDecorator{return(constructor:any...