如何使用http在angular2中发出放置请求? [英] How to make a put request in angular2 using http?

问题描述

我正在开发这个angular2应用程序，并且正在执行CRUD操作.

I am working on this angular2 application and I am doing CRUD operations.

我有用于制作get&的http. post请求.

I have http for making get & post requests.

我现在想执行put操作，但是找不到任何相关的内容.

I want to perform put operation now but cannot find anything relevant.

有输入吗?

谢谢.

推荐答案

如果您已经熟悉POST，那么

POST和PUT请求之间的唯一区别实际上是UT而不是OST， 对于前端至少是verb.

Only difference between POST and PUT request is literally UT instead of OST, it's just a verb, for front-end atleast.

Angular Docs(必须使其变得复杂)

// Update existing Hero
private put(hero: Hero) {
  let headers = new Headers();
  headers.append('Content-Type', 'application/json');

  let url = `${this.heroesUrl}/${hero.id}`;

  return this.http
             .put(url, JSON.stringify(hero), {headers: headers})
             .map(res => res.json());
}

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记住-可观察对象可能是惰性的(例如:Angular的Http请求)，因此即使您不想处理响应，也需要订阅它们以使请求执行. – @ user2171669

---

And remember - Observables can be lazy (eg: Angular's Http request) so you need to subscribe on them to make the request execute even if you don't want to handle the response. – @user2171669

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