好吧，您需要以react方式执行此操作，即保持电子邮件和密码输入的值处于某种状态，并在需要时检索它们。要保持电子邮件值处于某种状态，请onChange在电子邮件和密码输入上添加一个事件处理程序，如下所示：

<input id="email" name="email" type="email" onChange={this.handleChange} value={this.state.email} />
<input id="password" name="password" type="password" onChange={this.handleChange} value={this.state.password} />

与handleChange如下所示：

handleChange = (evt)=> { // If you are using typescript, type evt like this evt: React.ChangeEvent<HTMLInputElement>
    const target = event.target;
    const value = target.value;
    const name = target.name;

    this.setState({
      [name]: value
    });
}

该handleChange函数将同时保存email和password状态。现在您可以检索它们并在需要时使用它们，如下所示：

const {email, password} = this.state;

哦，首先记住初始化两个email和的值password

我已更新您的代码，如下所示：

    class MyAwesomeComponent extends React.Component {
       constructor() {
          super()
          this.state = {
             email: "",
             password: ""
          }
          this.handleSubmit = this.handleSubmit.bind(this);
          this.handleChange = this.handleChange.bind(this)
       }

       handleChange = (evt)=> {
        const target = event.target;
        const value = target.value;
        const name = target.name;

        this.setState({
          [name]: value
        });
       }

       handleSubmit(event) {
        event.preventDefault();
        const form = new FormData(event.target);
        const {email, password} = this.state;

        axios({
            method: 'post',
            url: 'http://localhost:3003/register',
            data: qs.stringify({email,password}),
            headers: {
              'content-type': 'application/x-www-form-urlencoded;charset=utf-8'
            }
          })
       }

       render() {
        return (
            <div className="content-landing">

                <form onSubmit={this.handleSubmit}>
                    <label htmlFor="email">Enter email</label>
                    <input id="email" name="email" type="email" onChange={this.handleChange} value={this.state.email} />

                    <label htmlFor="password">Enter password</label>
                    <input id="password" name="password" type="password" onChange={this.handleChange} value={this.state.password} />


                    <button>Register</button>
                </form>

            </div>

        )
      }
    }

   export default MyAwesomeComponent

有关更多信息，请查看React.js 文档

更改此代码

  data: qs.stringify({
              email: event.target.email.value,
              password: event.target.password.value
            })