自定义hook的书写方式

//   hooks/useObjectState.js

  
import { useState } from 'React'
 
function useObjectState(obj){

const [formData, setFormData] = useState(obj)
const handleSetFormData = (key, value) =>{

    formData[key] = value
    setFormData({...formData})

}

return [formData,handleSetFormData]

}

export default useObjectState

// hooks/index.js

import useObjectState from './useObjectState'


export {

    useObjectState

}

import { useObjectState } from '../hooks'
import './Login.css'

function Login (props){
    const [formData, handleSetFormData] = useObjectState({
    username:'',
    password:'',
})

return (
<div className='p-login'>
    {JSON.stringify{formData}}
    <form action=''>
        <div>
            <input type='text' value={formData.usename} 
                onChange={(e)=>{
                handleSetFormData('username', e.target.value)
            }}            
            placeholder='请输入账号'
            />
        </div>
        <div>    
            <input type='text' value={formData.password} 
                onChange={(e)=>{
                    handleSetFormData('password', e.target.value)
                }}            
            placeholder='请输入账号'
            />
        </div>
</div>

)
}

自己记录以防遗忘，手敲代码，未验证，请学习过程中自我鉴别哈，