blocks|key|4439986|text|很多东西都隐藏在：import+'rxjs/Rx';中，您可以尝试使用Observable.of来获取单个值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4439987|这对我有效(plunker)：|4439988|import+{Component}+from+'angular2/core';
import+{Observable}+from+'rxjs/Observable';
import+'rxjs/Rx';

@Component({
++selector:+'my-app',
++providers:+[],
++template:+`
++++<div>
++++++<h2>Hello+{{test+%7C+async}}</h2>+++++
++++</div>
++`,
++directives:+[]
})
export+class+App+{
++++test:+Observable<any>+=+Observable.of("I'm+an+observable");
++++constructor()+{
++}
}|code-block|syntax|javascript|4439989|entityMap|0|LINK|mutability|MUTABLE|url|http://plnkr.co/edit/j7kVjTaTaLOmDoLB8EdN?p=preview^0|9|H|Z|D|0|6|7|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@$9|10|A|11|1|12]]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

<p>A lot of the stuff is tucked away in:  <code>import 'rxjs/Rx';</code> You might try <code>Observable.of</code> for a single value.</p>

<p>This works for me (<a href="http://plnkr.co/edit/j7kVjTaTaLOmDoLB8EdN?p=preview">plunker</a>):</p>

<pre><code>import {Component} from 'angular2/core';
import {Observable} from 'rxjs/Observable';
import 'rxjs/Rx';

@Component({
  selector: 'my-app',
  providers: [],
  template: `
    &lt;div&gt;
      &lt;h2&gt;Hello {{test | async}}&lt;/h2&gt;     
    &lt;/div&gt;
  `,
  directives: []
})
export class App {
    test: Observable&lt;any&gt; = Observable.of("I'm an observable");
    constructor() {
  }
}
</code></pre>


blocks|key|4439924|text|.just(value)来自RxJS+v4，而angular2正在使用v5。它已经经过了广泛的重写，并且仍处于测试阶段，因此v5中的操作员缺少/更改了名称。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4439925|正如MarkM提到的，.of很好。我只想补充一点，你也可以使用.from，如果你只有一个值，或者一个值的数组。要重用您接受的答案中的示例，您可以使用类似(plunkr)的内容：|4439926|//our+root+app+component
import+{Component}+from+'angular2/core';
import+{Observable}+from+'rxjs/Observable';
import+'rxjs/Rx';

@Component({
++selector:+'my-app',
++providers:+[],
++template:+`
++++<div>
++++++<h2>Hello+{{test+%7C+async}}</h2>

++++</div>
++`,
++directives:+[]
})
export+class+App+{
++++test:+Observable<any>+=+Observable.from(["I'm+an+observable"]);
++++constructor()+{
++}
}|code-block|syntax|javascript|4439927|entityMap|0|LINK|mutability|MUTABLE|url|http://plnkr.co/edit/IdSkxCrIKB9YqJYrC69H?p=preview^0|0|C|0|B|3|V|5|25|6|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|I|5|J|7|15|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

<p><code>.just(value)</code> is from RxJS v4 while angular2 is using the v5. It has gone through an extensive rewrite, and it is still in beta so operators are missing/changed names in v5. </p>

<p><code>.of</code> is just fine, as MarkM mentioned. I just wanted to add that you can also use <code>.from</code> which works if you have just one value, or an array of values. To reuse the example from your accepted answer, you would use something like (<a href="http://plnkr.co/edit/IdSkxCrIKB9YqJYrC69H?p=preview">plunkr</a>): </p>

<pre><code>//our root app component
import {Component} from 'angular2/core';
import {Observable} from 'rxjs/Observable';
import 'rxjs/Rx';

@Component({
  selector: 'my-app',
  providers: [],
  template: `
    &lt;div&gt;
      &lt;h2&gt;Hello {{test | async}}&lt;/h2&gt;

    &lt;/div&gt;
  `,
  directives: []
})
export class App {
    test: Observable&lt;any&gt; = Observable.from(["I'm an observable"]);
    constructor() {
  }
}
</code></pre>


blocks|key|4439934|text|使用of函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4439935|import+{of}+from+'rxjs';

var+requestStream+=+of('https://api.github.com/users');|code-block|syntax|javascript|4439936|entityMap|0|LINK|mutability|MUTABLE|url|https://rxjs.dev/api/index/function/of^0|2|2|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<p>Use the <a href="https://rxjs.dev/api/index/function/of" rel="nofollow noreferrer">of</a> function:</p>

<pre class="lang-js prettyprint-override"><code>import {of} from 'rxjs';

var requestStream = of('https://api.github.com/users');
</code></pre>


<p>I would like to emit a single value. </p>

<p>According to this <a href="https://gist.github.com/staltz/868e7e9bc2a7b8c1f754">post</a>, the following should be valid:</p>

<pre><code>var requestStream = Rx.Observable.just('https://api.github.com/users');
</code></pre>

<p>However, this does not work. <code>just</code> is not defined.</p>

<p>Has it been deprecated? Is there something that I can use instead?</p>


Emit a single value

我想发出一个单一的值。根据此，以下内容应有效：var requestStream = Rx.Observable.just('https://api.github.com/users');然而，这是行不通的。未定义just。它是否已被弃用？有没有我可以用的东西？

问发出单个值
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问发出单个值EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问发出单个值
EN