如果你还在寻找像Angular这样的服务，你可以尝试react-rxbuilder库

您可以使用@Injectable来注册服务，然后您可以使用useService或CountService。在组件中使用服务

import { RxService, Injectable, useService } from "react-rxbuilder";

@Injectable()
export class CountService {
  static ins: CountService;

  count = 0;
  inc() {
    this.count++;
  }
}

export default function App() {
  const [s] = useService(CountService);
  return (
    <div className="App">
      <h1>{s.count}</h1>
      <button onClick={s.inc}>inc</button>
    </div>
  );
}

// Finally use `RxService` in your root component
render(<RxService>{() => <App />}</RxService>, document.getElementById("root"));

预防措施

取决于rxjs和typescript 不能在服务中使用箭头函数

我和你处境相同。在你提到的情况下，我将输入验证UI组件实现为一个React组件。

我同意验证逻辑本身的实现应该(必须)不耦合。因此，我会把它放在一个单独的JS模块中。

也就是说，对于不应该耦合的逻辑，在单独的文件中使用JS模块/类，并使用require/import将组件与“服务”解耦。

这允许独立地进行依赖注入和单元测试。

如果你还在寻找像Angular这样的服务，你可以尝试react-rxbuilder库

您可以使用@Injectable来注册服务，然后您可以使用useService或CountService。在组件中使用服务

import { RxService, Injectable, useService } from "react-rxbuilder";

@Injectable()
export class CountService {
  static ins: CountService;

  count = 0;
  inc() {
    this.count++;
  }
}

export default function App() {
  const [s] = useService(CountService);
  return (
    <div className="App">
      <h1>{s.count}</h1>
      <button onClick={s.inc}>inc</button>
    </div>
  );
}

// Finally use `RxService` in your root component
render(<RxService>{() => <App />}</RxService>, document.getElementById("root"));

预防措施

取决于rxjs和typescript 不能在服务中使用箭头函数

在React世界中，我们有两种类型的逻辑:有状态的和无状态的。现在，这是开始React时要掌握的主要概念。这里我们更新的状态应该是更新UI，而不是Angular对dom的直接更新。两种类型的逻辑是:

That do not depend on state changes, i.e. static logic which doesn't need to re-render something based on state changes. For such cases just create regular js files and import them like a library or helper methods If you have some code that depends on state and u need to resuse it then two options - hocs and the newer hooks. Hooks are a bit hard to wrap our heads around but basically they would force their parent to rerender if their internal state changes so any stateful logic can be defined and reused in different components, and each hook instance would have its own isolated scope.

理解状态和声明性组件需要一点思维转变，但可以在评论中随意提出后续问题

当你意识到Angular服务只是一个对象，它交付了一组与上下文无关的方法时，问题就变得极其简单了。只是Angular的DI机制让它看起来更复杂。DI非常有用，因为它负责为您创建和维护实例，但您并不真正需要它。

考虑一个名为axios的流行AJAX库(你可能听说过):

import axios from "axios";
axios.post(...);

它不是一个服务吗?它提供了一组负责某些特定逻辑的方法，并且独立于主代码。

Your example case was about creating an isolated set of methods for validating your inputs (e.g. checking the password strength). Some suggested to put these methods inside the components which for me is clearly an anti-pattern. What if the validation involves making and processing XHR backend calls or doing complex calculations? Would you mix this logic with mouse click handlers and other UI specific stuff? Nonsense. The same with the container/HOC approach. Wrapping your component just for adding a method which will check whether the value has a digit in it? Come on.

我只需要创建一个名为ValidationService.js的新文件，并按照如下方式组织它:

const ValidationService = {
    firstValidationMethod: function(value) {
        //inspect the value
    },

    secondValidationMethod: function(value) {
        //inspect the value
    }
};

export default ValidationService;

然后在你的组件中:

import ValidationService from "./services/ValidationService.js";

...

//inside the component
yourInputChangeHandler(event) {

    if(!ValidationService.firstValidationMethod(event.target.value) {
        //show a validation warning
        return false;
    }
    //proceed
}

您可以在任何地方使用这项服务。如果验证规则改变了，你只需要关注ValidationService.js文件。

您可能需要一个依赖于其他服务的更复杂的服务。在这种情况下，您的服务文件可能返回一个类构造函数而不是一个静态对象，因此您可以在组件中自己创建该对象的实例。您还可以考虑实现一个简单的单例，以确保在整个应用程序中始终只有一个服务对象实例在使用。

我也来自Angular.js领域，React.js中的服务和工厂更简单。

你可以像我一样使用普通的函数或类，回调样式和事件Mobx:)

// Here we have Service class > dont forget that in JS class is Function class HttpService { constructor() { this.data = "Hello data from HttpService"; this.getData = this.getData.bind(this); } getData() { return this.data; } } // Making Instance of class > it's object now const http = new HttpService(); // Here is React Class extended By React class ReactApp extends React.Component { state = { data: "" }; componentDidMount() { const data = http.getData(); this.setState({ data: data }); } render() { return <div>{this.state.data}</div>; } } ReactDOM.render(<ReactApp />, document.getElementById("root")); <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>JS Bin</title> </head> <body> <div id="root"></div> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> </body> </html>

这里有一个简单的例子: