不带.subscribe回调的有角http.post [英] Angular http.post without .subscribe callback

问题描述

我想知道我是否可以仅发出http 发布请求而无需订阅回调

I'm wondering if I can make just a http post request without subscribing on callbacks, something like this

 this._http.post('/list/items/update?itemId=' + itemId + "&done=" + done, null);

代替此

 this._http.post('/list/items/update?itemId=' + itemId + "&done=" + done, null)
        .subscribe();

推荐答案

我认为你不能.

http.post(以及获取，放置，删除等)返回一个冷的Observable，即:

http.post (and get, put, delete, etc) returns a cold Observable, i.e. an Observable for which:

其基本生产者是在订阅期间创建和激活的

its underlying producer is created and activated during subscription

来源.

这意味着Observable表示的功能只能通过subscribe()方法激活.

This means the function represented by the Observable is activated only with the subscribe() method.

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