问题描述
我决定尝试 Mobx 并面临组件对存储库中不断变化的字段缺乏响应的问题。我看了类似的主题,但我仍然不明白问题是什么。如果在更改后将属性值打印到控制台,您将看到实际结果。
index.js
import React from 'react';
import ReactDOM from 'react-dom';
import { Provider } from "mobx-react";
import AppStore from "./AppStore";
import App from './App';
ReactDOM.render(
<React.StrictMode>
<Provider AppStore={AppStore}>
<App />
</Provider>
</React.StrictMode>,document.getElementById('root')
);
App.js
import React,{ Component } from "react";
import { inject,observer } from "mobx-react";
@inject('AppStore')
@observer class App extends Component {
render() {
const { AppStore } = this.props;
console.log(AppStore);
return(
<div className="App">
{ this.props.AppStore.counter }
<hr/>
<button onClick={this.props.AppStore.increment}>+</button>
<button onClick={this.props.AppStore.decrement}>-</button>
</div>
)
}
}
export default App;
AppStore.js
import { observable,action } from "mobx";
class AppStore {
@observable counter = 0;
@action increment = () => {
this.counter = this.counter + 1;
console.log(this.counter);
}
@action decrement = () => {
this.counter = this.counter - 1;
console.log(this.counter);
}
}
const store = new AppStore();
export default store;
解决方法
Since mobx@6.0.0
decorators are not enough。您还必须使用 makeObservable
手动使您的班级可观察。
class AppStore {
@observable counter = 0;
constructor() {
makeObservable(this);
}
@action increment = () => {
this.counter = this.counter + 1;
}
@action decrement = () => {
this.counter = this.counter - 1;
}
}