React:TypeError: this.setstate 不是 function

Question

我遇到了 TypeError 問題：this.setstate is not a function。 我正在使用 react 創建一個具有登錄和注冊頁面的應用程序，兩個頁面都有 email、名稱和密碼輸入字段，在輸入字段中的值時會立即發生錯誤。 下面是登錄頁面中我的代碼示例，我怎樣才能解決這個問題我已經盡了最大努力，似乎我無法弄清楚我的代碼有什么問題，因為編譯成功，輸入時沒有任何其他錯誤. 我也不太擅長目前正在學習的編碼。

`從'react'導入反應；

class Signin extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            signInEmali: '',
            signInPassword: '',
        };
    }

    onEmaliChange = (Event) => {
        this.setstate({ signInEmali: Event.target.value });//the error happens here
    };

    onPasswordChange = (Event) => {
        this.setstate({ signInPassword: Event.target.value });//the error happens here
    };
    onSubmitSignIn = () => {
        fetch('http://localhost:3001/signin', {
            method: 'post',
            headers: { 'content-type': 'application/json' },
            body: JSON.stringify({
                email: this.state.signInEmali,
                password: this.state.signInPassword,
            }),
        })
            .then((Response) => Response.json())
            .then((data) => {
                if (data === 'success') {
                    this.props.onRouteChange('home');
                }
            });
    };
render() {
        const { onRouteChange } = this.props;
        return (
            <article className="br3  b--black-10 mv4 w-100 w-50-m w-25-l mw6 shadow-5 center">
                <main className="pa4 black-80">
                    <div className="measure">
                        <fieldset id="sign_up" className="ba b--transparent ph0 mh0">
                            <legend className="f1 fw6 ph0 mh0">Sign In</legend>
                            <div className="mt3">
                                <label className="db fw6 lh-copy f6" htmlFor="email-address">
                                    Email
                                </label>
                                <input
                                    className="pa2 input-reset ba bg-transparent hover-bg-black hover-white w-100"
                                    type="email"
                                    name="email-address"
                                    id="email-address"
                                    onChange={this.onEmaliChange}
                                />
                            </div>
                            <div className="mv3">
                                <label className="db fw6 lh-copy f6" htmlFor="password">
                                    Password
                                </label>
                                <input
                                    className="b pa2 input-reset ba bg-transparent hover-bg-black hover-white w-100"
                                    type="password"
                                    name="password"
                                    id="password"
                                    onChange={this.onPasswordChange}
                                />
                            </div>
                        </fieldset>
                        <div className="">
                            <input
                                onClick={this.onSubmitSignIn}
                                className="b ph3 pv2 input-reset ba b--black bg-transparent grow pointer f6 dib"
                                type="submit"
                                value="Sign in"
                            />
                        </div>
                        <div className="lh-copy mt3">
                            <p
                                onClick={() => onRouteChange('register')}
                                className="f6 link dim black db pointer">
                                Register
                            </p>
                        </div>
                    </div>
                </main>
            </article>
        );
    }
}

export default Signin;

`

Answer 1

只需在代碼setstate更改為setState即可