相关疑难解决方法(0)

所以我有这个:

let total = newDealersDeckTotal.reduce(function(a, b) {
  return a + b;
},
0);

console.log(total, 'tittal'); //outputs correct total
setTimeout(() => {
  this.setState({dealersOverallTotal: total});
}, 10);

console.log(this.state.dealersOverallTotal, 'dealersOverallTotal1'); //outputs incorrect total

newDealersDeckTotal只是一个数字数组,[1, 5, 9]但是this.state.dealersOverallTotal不能给出正确的总数但是total呢？我甚至提出了超时延迟,看看是否解决了这个问题.任何明显的或我应该发布更多的代码？

我正在尝试学习钩子，而useState方法使我感到困惑。我正在将初始值分配给数组形式的状态。即使使用spread(...)或，useState中的set方法对我也不起作用without spread operator。我在另一台PC上制作了一个API，我正在调用它并提取要设置为状态的数据。

这是我的代码：

import React, { useState, useEffect } from "react";
import ReactDOM from "react-dom";

const StateSelector = () => {
  const initialValue = [
    {
      category: "",
      photo: "",
      description: "",
      id: 0,
      name: "",
      rating: 0
    }
  ];

  const [movies, setMovies] = useState(initialValue);

  useEffect(() => {
    (async function() {
      try {
        //const response = await fetch(
        //`http://192.168.1.164:5000/movies/display`
        //);
        //const json = await response.json();
        //const result = json.data.result;
        const result = [
          {
            category: …