Observable.of 不是正确导入的函数

Question

我在 angular 6 中为 observable 导入 "of" 方法时遇到问题，即使是全新的项目安装，所有更新的包，我仍然会收到错误消息。所以，我做了一个小项目

这是提供的服务

import { Injectable } from '@angular/core';
import { TableRow } from './table-row';
import { Observable, of } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class TestTableService {

  private testData : TableRow[] = [
    {id:1, name:'pi', value:3.14},
    {id:2, name:'euler', value:2.71},
    {id:3, name:'Feigenbaum constant', value:2.50290},
    {id:4, name:'Mills constant', value:1.30637},
    {id:5, name:'one', value:1},
    {id:6, name:'square root of 2', value:1.41421}
  ];

  constructor() { }

  public getData() : Observable<TableRow[]>
  {
    return Observable.of(this.testData);
  }
}

这是使用它的组件：

import { Component, OnInit } from '@angular/core';
import { TestTableService } from './../test-table.service';
import { TableRow } from './../table-row';

@Component({
  selector: 'app-test-table',
  templateUrl: './test-table.component.html',
  styleUrls: ['./test-table.component.css']
})
export class TestTableComponent implements OnInit {
  tableData : TableRow[] = [];

  constructor(private testTable : TestTableService) { }

  ngOnInit() {
    this.testTable.getData()
      .subscribe(table => this.tableData = table);
  }

}

注意导入与其他问题完全相同

项目package.json：

{
  "name": "angular-table-test",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^6.0.2",
    "@angular/cdk": "^6.1.0",
    "@angular/common": "^6.0.2",
    "@angular/compiler": "^6.0.2",
    "@angular/core": "^6.0.2",
    "@angular/forms": "^6.0.2",
    "@angular/http": "^6.0.2",
    "@angular/material": "^6.1.0",
    "@angular/platform-browser": "^6.0.2",
    "@angular/platform-browser-dynamic": "^6.0.2",
    "@angular/router": "^6.0.2",
    "core-js": "^2.5.4",
    "hammerjs": "^2.0.8",
    "rxjs": "^6.0.0",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular/compiler-cli": "^6.0.2",
    "@angular-devkit/build-angular": "~0.6.3",
    "typescript": "~2.7.2",
    "@angular/cli": "~6.0.3",
    "@angular/language-service": "^6.0.2",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~1.4.2",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1"
  }
}

可能是什么问题？

Answer 1

在 rxjs 6.x 中，of 不再是 Observable 上的静态函数。

因此，您只需调用 of(…).

而不是调用 Observable.of(…)

有关从 rxjs 5.x 到 6+ 的迁移信息，请参阅 here。

Answer 2

在 Rxjs 6（或 angular6）中，导入路径和 Observable 创建方法已经改变。例如-

Observable.fromEvent 现在变成了 fromEvent 。 Observable.of 已变为 of，与 interval 类似（之前是 Observable.interval）。它们不再是 Observable class 的静态方法。另一个重大变化是现在必须使用 pipe 运算符。例如，为了在 Observable 上使用 map 运算符然后在其上使用 subscribe 我们现在必须遵循以下语法 -

Observable.pipe(map((val) => ...)).subscribe();

我们可以在pipe里面添加多个逗号分隔的运算符，从左到右依次执行。

查看这些链接以获得更多参考：

https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md

https://www.academind.com/learn/javascript/rxjs-6-what-changed/

Observable.of 不是正确导入的函数

Observable.of is not a function with correct import

angular

angular6

rxjs6