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TTGL's questions

Martin Hope
TTGL
Asked: 2023-11-21 17:30:59 +0000 UTC
  • 5

告诉我我在函数中哪里出错了。条件是：（返回从零到结果数的奇数计数。结果数被考虑在内。）
示例：

  • 4 => 2
  • -5 => 3
  • 10 => 5
  • -15 => 8

问题是我的函数在使用负参数时无法正常工作 - 它返回 0

function getCountOfOddNumbers(number) {
  let count = 0;
  for (let i = 0; i <= number; i += 1) {
    if (i % 2 !== 0) {
      count += 1;
    }
  }
  return count;
}
console.log(getCountOfOddNumbers(-5))

javascript
Martin Hope
TTGL
Asked: 2023-11-07 22:25:46 +0000 UTC
  • 5

我想让程序在 ID 不在对象中时返回文本“找不到用户”（拒绝）。但最终的结果是一个空数组。
告诉我我哪里做错了？ 

const USERS = [
  { id: '001', name: "Алексей", age: 25 },
  { id: '002', name: "Иван", age: 28 },
  { id: '003', name: "Егор", age: 30 },
];

function fetchUser(id) {
  return new Promise ((resolve, reject) => {
    setTimeout(() => {
    const objId = USERS.filter( u => u.id == id)
    
      if (objId) {
      resolve(objId)
      }else {
      reject(new Error('Пользователь не найден'))
      }
    }, 2500)
  });
}

async function start() {
  try {
    const result = await fetchUser('004');
    console.log(result);
  } catch (error) {
    console.error(error)
  } 
}

start();

javascript promise
Martin Hope
TTGL
Asked: 2023-09-22 00:52:46 +0000 UTC
  • 5

大家好。我想将路径与AppRouter分开放在路由文件中，但它不起作用。告诉我可能是什么问题，我无法弄清楚。 浏览器错误（最后两个） 源文件

应用程序.js

import React from "react";
import { BrowserRouter } from "react-router-dom";
import AppRouter from "./components/UI/AppRouter";
import Navbar from "./components/UI/Navbar/Navbar";
import './styles/app.css';


function App() {
        return (
            <BrowserRouter>
              <Navbar/>
                <AppRouter/>
            </BrowserRouter>
        )
}
          
export default App;

应用路由器

import React from 'react';
import { Navigate, Route, Routes } from "react-router-dom";
import {routes} from "../../router/routes"

const AppRouter = () => {
    return (
        <Routes>
           {routes.map(route => 
                <Route 
                    element={route.element}
                    path={route.path}
                    exact={route.exact}
                />
           )}
         <Route
             path="*"
             element={<Navigate to ='/posts'/>}>
         </Route>
   </Routes>  
    );
};

export default AppRouter;

路线

import About from "../pages/About"
import Posts from "../pages/Posts"
import PostIdPage  from "../pages/PostIdPage"

export const routes = [
    {path: '/about', element: About, exact: true},
    {path: '/posts', element: Posts, exact: true},
    {path: '/posts/:id', element: PostIdPage, exact: true},

]

预先感谢大家的帮助！

javascript