如何从`Rx`(非角度)导入`Observable` [英] How to import `Observable` from `Rx` (not angular)

问题描述

我正在使用 SystemJS 将我的 es2015 项目加载到浏览器中.

I'm using SystemJS to load my es2015 project into the browser.

这是我做的

import {Observable} from 'rxjs/Rx';

const button = document.querySelector('button');
const start$ = Observable.fromEvent(button, 'click');

在这种情况下，Observable 是 undefined.所以我尝试了

In this case Observable is undefined. So I tried

import Observable from 'rxjs/Observable';

在这种情况下 Observable 是一个对象但 Observable.fromEvent 是 undefined(它似乎是一个空对象)

In which case Observable is an object but Observable.fromEvent is undefined (it seems to be an empty object)

我终于做到了

import Rx from 'rxjs/Rx' // Rx.Observable

确实有效.任何想法为什么其他两个不起作用?我看过他们使用这些的代码.导入 Observable 的首选方法是什么?

which did work. Any ideas why the other two didn't work? I have seen code in which they used these. What would be the preferred way to import Observable?

更新:如下所述，自述文件中对所有内容进行了描述.但是如果我这样做

UPDATE: As stated below its all described in the README. However if I do that

import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/fromEvent';

const start$ = Observable.fromEvent(startButton, 'click');

我得到 Observable 是 undefined.如果我这样做

I get Observable is undefined. And if I do

import Observable from 'rxjs/Observable';

Observable 又是一个空对象.fromEvent 未添加.

the Observable is an empty object again. The fromEvent is not added.

我使用的是 RxJs 5.1.1，这是我的 index.html/systemjs 部分:

I'm using RxJs 5.1.1 and here is my index.html/systemjs part:

 <script src="./node_modules/systemjs/dist/system.js"></script>
  <script>
      SystemJS.config({
          baseURL: 'node_modules',
          packages: {
              '.': {
                  defaultJSExtensions: 'js'
              }
          },
          map: {
              'plugin-babel': 'systemjs-plugin-babel/plugin-babel.js',
              'systemjs-babel-build': 'systemjs-plugin-babel/systemjs-babel-browser.js'
          },
          transpiler: 'plugin-babel'
      });

      SystemJS.import('/js/main.js');
  </script>

推荐答案

As it notes 在 README 中，您可以使用 import { Observable } from 'rxjs/Observable';:

As it notes in the README, you can use import { Observable } from 'rxjs/Observable';:

通过修补仅导入您需要的内容(这对于大小敏感的捆绑很有用)

To import only what you need by patching (this is useful for size-sensitive bundling)

这为您提供了一个非常小的Observable，您需要在其中明确添加您计划使用的任何额外功能；在您的情况下，请按照以下方式操作:

This gives you a very minimal Observable, to which you need to explicitly add any extra functionality you plan to use; in your case, follow it with:

import 'rxjs/add/observable/fromEvent';

这篇关于如何从`Rx`(非角度)导入`Observable`的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！