object - react - setState 找到对象项然后分配

Question

我有状态的对象-

this.state = {
  states: {
    na: 0, s1a: 0, s2a: 0, s3a: 0, s4a: 0, l1a: 0, l2a: 0, l3a: 0, t1a: 0, t2a: 0, t3a: 0,
    nb: 0, s1b: 0, s2b: 0, s3b: 0, s4b: 0, l1b: 0, l2b: 0, l3b: 0, t1b: 0, t2b: 0, t3b: 0
  },

我想在我的函数中更改某些键的值-

onInputUpdated(id){
var array = {};
let char = id.slice(-1);

switch(char){
  case 'a':
    array[id] = this.getY(ReactDOM.findDOMNode(this.refs[id].refs.inp).value);
    break;

  case 'b':
    array[id] = this.getX(ReactDOM.findDOMNode(this.refs[id].refs.inp).value);
    break;
}

this.setState({
  states: { id : array[id]}
});

但是没有id，id代表字符串'na'或其他......那我该怎么做呢？有什么建议吗？顺便说一句 onIputUpdated(id) 是来自孩子的回调..

Answer 1

首先，您不能直接更新嵌套状态。您将不得不更新整个“状态”对象。像这样的东西

let oldStates = this.state.states; oldStates[id] = array[id]; this.setState({ states: { ...oldStates } });