react 收集表单数据 react-hook-form

import React from 'react'
import ReactDOM from 'react-dom'
import { useForm } from 'react-hook-form'

function App() {
  const { register, handleSubmit, errors } = useForm() // initialize the hook
  const onSubmit = (data) => {
    console.log(data)
  }

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <input name="firstname" ref={register} /> {/* register an input */}
      <input name="lastname" ref={register({ required: true })} />
      {errors.lastname && 'Last name is required.'}
      <input name="age" ref={register({ pattern: /\d+/ })} />
      {errors.age && 'Please enter number for age.'}
      <input type="submit" />
    </form>
  )
}

ReactDOM.render(<App />, document.getElementById('root'))