我正在尝试为状态数组 personState 中的值实现名称更改处理程序。const [personState, setPersonState] = useState([ { id:'asdasd', name: "Max", age: 28 }, { id:'asdasdsd', name: "Manu", age: 29 }, { id:'assddasd', name: "Stan", age: 31 }, ]);这是处理名称更改事件的函数:const nameChangeHandler = (event, id) => { const personIndex = personState.findIndex(p => { return p.id === id;//find index of the value in personstate with id equal id passed in }) const person = {...personState[personIndex]} // get all the object value inside that person person.name = event.target.value; //change name of that copy person to the input value const persons = [...personState]; //copy array of current personState persons[personIndex] = person// change value of that person in the array setPersonState(...personState, persons);//set state with the new array }下面是我在切换显示时使用 map 遍历 personState 数组的地方。用于显示数据和删除数据的映射工作但是当我想实现名称更改时,它突然返回:TypeError: personState.map is not a functionAppD:/React App/react-guide/src/App.js:52 49 | <button onClick={() => togglePersonHandler()}> 50 | Switch Name 51 | </button>> 52 | {showPerson ? personState.map((person,index) => { 53 | return <Person click = {()=>deletePersonHandler(index)} changed={(event) => nameChangeHandler(event, person.id)} key={person.id} name={person.name} age ={person.age}/> 54 | }) : null} 55 | </div>任何帮助将非常感激
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撒科打诨
TA贡献1934条经验 获得超2个赞
这是罪魁祸首:
setPersonState(...personState, persons);//set state with the new array
它应该被新值替换(只有一个参数)
setPersonState(persons);//set state with the new array
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