https://www.bilibili.com/video/BV1ZB4y1Z7o8?spm_id_from=333.788.videopod.episodes&vd_source=5fa338953c49cd2c52e91d8f48756175&p=11
const [form,setForm]=useState({name:'jack'})
执行后，form的值为{name:'jack'}
1.直接替换整个对象
setForm({name:'Rose'})
2.如果有多个属性，替换局部属性
setForm({...form,name:'Rose'})