在 setState 之前反应 if/else returns

Question

我想通过 Function ScoreCalc 然后 return 最后 "primeCount" 和 setState primeScore 到那个数字。

this.state.animeMax 在 componentWillMount 中运行 ScoreCalc() 时仍然为空 ''。当我刷新页面时，primeScore 或 primeCount 更改值。我猜这是因为有时 "max" 状态有时没有安装！？

如果有人有想法，请告诉我。

谢谢！

export class Quality extends Component {
    constructor (props) {
        super (props) 
            this.state = {
                primeScore: 0,
                netflixScore: 0,
                huluScore: 0,
                provider:[],
                actionMax:'',
                animeMax:'',
                childrenMax:'',
                comedyMax:'',
                documentaryMax:'',
                horrorMax:'',
                musicalMax:'',
                romanceMax:'',
                scifiMax:'',
                thrillerMax:'',
            }
            this.ScoreCalc = this.ScoreCalc.bind(this);
    }

componentWillMount (){
    axios.get('http://localhost:8001/provider')
        .then(res => this.setState({
            provider: res.data
        },()=>{this.ScoreCalc()}))
    axios.get('http://localhost:8001/provider/actionmax')
        .then(res => this.setState({actionMax: res.data}))
.....10 more axios requests to setState for other "max"....

}

ScoreCalc (){
        let primeCount = 0
            if(this.state.provider[0].primeAction >= this.state.actionMax){
                primeCount += this.props.user.action;
                console.log(primeCount)
            } else {
                primeCount += (this.props.user.action*this.state.provider[0].primeAction/this.state.actionMax)
            }

            if(this.state.provider[0].primeAnime >= this.state.animeMax){
                primeCount += this.props.user.anime;
            } else {
                primeCount += this.props.user.anime*this.state.provider[0].primeAnime/this.state.animeMax;
                console.log(this.state.animeMax) //returns empty ''
                console.log(primeCount) //return infinity
            }

            if(this.state.provider[0].primeChildren >= this.state.childrenMax){
                primeCount += this.props.user.children;
            } else {
                primeCount += this.props.user.children*this.state.provider[0].primeChildren/this.state.childrenMax
            }

         console.log(primeCount); //return infinity
         this.setState({primeScore: primeCount})
}

Answer 1

你好像有错别字？

在 scoreCalc() 中，您是这样检查的：

if(this.state.provider[0].primeAction >= this.actionMax){

我认为应该是：

if(this.state.provider[0].primeAction >= this.state.actionMax){

其他 if 的也是一样吗？

在 setState 之前反应 if/else returns

React if/else returns before setState

javascript

state

if-statement

infinite-loop

reactjs