Javascript 使用setstate更改字典，但不工作。反应

这就是它的要点，我想根据

traildays

字符串中是否提到它来更改每天的真与假。事情的结局只是周六变为现实

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我认为这与…天重置所有内容有关，但任何帮助都将不胜感激，谢谢。

您是正确的，每个setter使用相同的天值，从

const[days，setDays]

覆盖其中的一个字段。请尝试方便的

setDays格式（prevValue=>newValue）

。作为参数，您将收到最新的模型状态，因此可以增量应用更改：

const [days, setDays] = useState({ Monday: false, Tuesday: false,Wednesday: false,Thursday: false, Friday: false,Saturday: false,Sunday:false });

const [traildays, setTrialDays] = useState('MON,WED,THUR,SAT');

const Changedays = async () => { 
        if(traildays.includes('MON') == true) {setDays({...days,Monday:!days.Monday})}
        if(traildays.includes('TUE') == true) {setDays({...days,Tuesday:!days.Tuesday})}
        if(traildays.includes('WED') == true) {setDays({...days,Wednesday:!days.Wednesday})}
        if(traildays.includes('THUR') == true) {setDays({...days,Thursday:!days.Thursday})}
        if(traildays.includes('FRI') == true) {setDays({...days,Friday:!days.Friday})}
        if(traildays.includes('SAT') == true) {setDays({...days,Saturday:!days.Saturday})}
        if(traildays.includes('SUN') == true) {setDays({...days,Sunday:!days.Sunday})}

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您是正确的，每个setter使用相同的天值，从

const[days，setDays]

并覆盖其中的一个字段。请尝试方便的

setDays格式（prevValue=>newValue）

。作为参数，您将收到最新的模型状态，因此可以增量应用更改：

const [days, setDays] = useState({ Monday: false, Tuesday: false,Wednesday: false,Thursday: false, Friday: false,Saturday: false,Sunday:false });

const [traildays, setTrialDays] = useState('MON,WED,THUR,SAT');

const Changedays = async () => { 
        if(traildays.includes('MON') == true) {setDays({...days,Monday:!days.Monday})}
        if(traildays.includes('TUE') == true) {setDays({...days,Tuesday:!days.Tuesday})}
        if(traildays.includes('WED') == true) {setDays({...days,Wednesday:!days.Wednesday})}
        if(traildays.includes('THUR') == true) {setDays({...days,Thursday:!days.Thursday})}
        if(traildays.includes('FRI') == true) {setDays({...days,Friday:!days.Friday})}
        if(traildays.includes('SAT') == true) {setDays({...days,Saturday:!days.Saturday})}
        if(traildays.includes('SUN') == true) {setDays({...days,Sunday:!days.Sunday})}

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@udalmik说了什么，或者您可能希望将状态设置一次，以不进行任何不必要的重新渲染

if(traildays.includes('MON') == true) {
  setDays(prevDays => {
    return {...prevDays, Monday:!days.Monday};
  });
}

---

@udalmik说了什么，或者您可能希望将状态设置一次，以不进行任何不必要的重新渲染

if(traildays.includes('MON') == true) {
  setDays(prevDays => {
    return {...prevDays, Monday:!days.Monday};
  });
}

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谢谢，伙计，工作完美谢谢，伙计，工作完美谢谢，那很有用谢谢，那很有用