如何在不清除初始状态的情况下设置单个数组中的对象数组。
const [arr,setArr]=useState([])
const arr1=[{key:'a',value:'a'},{key:'b',value:'b'}]
const arr2=[{key:'c',value:'c'},{key:'d',value:'d'}]
1st cycle setState
setArr((prevState)=>(prevState.push(...arr1)) // required state arr=[{key:'a',value:'a'},{key:'b',value:'b'}]
2st cycle setState
setArr((prevState)=>(prevState.push(...arr2)) // required state arr=[{key:'a',value:'a'},{key:'b',value:'b'},{key:'c',value:'c'},{key:'d',value:'d'}]
最佳答案
Array#push
返回新数组的 length
。尝试使用 spread operator
相反:
setArr((prevState) => [...prevState, ...arr1]);
setArr((prevState) => [...prevState, ...arr2]);
关于arrays - 如何在不删除旧状态的情况下设置对象的状态数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/68235627/