javascript - 在 MobX 中使用 React 时可以直接修改状态吗？

Question

我不应该这样做的唯一原因是让 react 更新 View 。 https://facebook.github.io/react/docs/state-and-lifecycle.html#using-state-correctly
但 MobX-react 似乎为我做了这些肮脏的工作。我只需要将 this.state 标记为可观察的，一切都会按预期进行。有什么缺点吗？我不想把所有州都扔进一个巨大的商店。

JSFiddle link

代码:

const {observable, computed} = mobx;
const {observer} = mobxReact;
const {Component} = React;

@observer
class Form extends React.Component{
    @observable state = {
        username: '',
        password: '',
    };

    constructor(...args) {
        super(...args);
        this.handleSubmit = this.handleSubmit.bind(this)
    }

    render() {
        return  <form onSubmit={this.handleSubmit}>
                    <label>
                    Name:
                    <input type="text" value={this.state.username} onChange={event => this.state.username = event.target.value} />
                    </label>
                    <div>username: {this.state.username}</div>
                    <input type="submit" value="Submit" />
                </form>;
    }

    handleSubmit(event: Event) {
        event.preventDefault();
        console.log(this.state.username);
    }
}

ReactDOM.render(
    <div>
        <Form />
        <mobxDevtools.default />
    </div>
, document.getElementById('mount'));

Answer 1

最好完全绕过state，直接将可观察数据放在类上。

示例 ( JS Bin )

const {observable, computed} = mobx;
const {observer} = mobxReact;
const {Component} = React;

@observer
class Form extends React.Component{
    @observable username = '';
    @observable password = '';

    constructor(props) {
        super(props);
        this.handleSubmit = this.handleSubmit.bind(this)
    }

    render() {
        return <form onSubmit={this.handleSubmit}>
            <label>
                Name:
                <input type="text" value={this.username} onChange={event => this.username = event.target.value} />
            </label>
            <div>username: {this.username}</div>
            <input type="submit" value="Submit" />
        </form>;
    }

    handleSubmit(event: Event) {
        event.preventDefault();
        console.log(this.username, this.password);
    }
}

ReactDOM.render(
    <div>
        <Form />
    </div>
, document.getElementById('mount'));