2

我在导入 Angular 6 中可观察的“of”方法时遇到问题，即使安装了全新的项目，所有更新的包，我仍然得到错误。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);
  }

}

请注意，导入与其他问题相同

我得到的错误

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"
  }
}

角度 cli 版本输出

可能是什么问题呢？

4

2 回答 2

10

在rxjs6.x 中，of不再是Observable.

因此，Observable.of(…)您只需调用 ，而不是调用of(…)。

从5.x 升级到 6+时，请参阅此处了解此信息和其他迁移信息。rxjs

于 2018-05-22T13:10:15.123 回答
4

在 Rxjs 6（或 Angular 6）中，导入路径和 Observable 创建方法发生了变化。例如 -

Observable.fromEvent现在变成了fromEvent。 Observable.of已经变成of，类似地interval（Observable.interval以前）。它们不再是 Observable 类的静态方法。另一个很大的变化是pipe现在必须使用操作符。例如，为了map在 Observable 上使用运算符然后subscribe在其上使用，我们现在必须遵循以下语法 -

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

我们可以在其中添加多个逗号分隔的运算符，这些运算符pipe将从左到右依次执行。

检查这些链接以获取更多参考：

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

https://www.academind.com/learn/javascript/rxjs-6-what-c​​hanged/

于 2018-05-22T13:13:46.513 回答