React App 不使用布局优先方法呈现

Question

我正在尝试制作一个新的 react 应用程序并使用我的布局优先方法呈现它，但我的屏幕上没有任何内容。这是我使用的代码--->

App.js

import React from "react";
import HomeLayoutHOC from "./HOC/Home.Hoc";
import Temp from "./Component/temp";


function App() {
  return (
    <>
      <HomeLayoutHOC path="/" exact component={Temp}/>
    </>
  );
};

export default App;

然后DefaultHOC

import React from "react";
import { Route } from "react-router-dom";
import HomeLayout from "../layout/home.layout";


const HomeLayoutHOC = ({ component: Component, ...rest }) => {
    return (
        <>
            <Route
                {...rest}
                component={(props) => {
                    <HomeLayout>
                        <Component {...props}/>
                    </HomeLayout>
            }}
        />
        </>
    );
};
export default HomeLayoutHOC;

还有主页布局

import React from "react";
const HomeLayout = (props) => {
    return (<>
        home Layout
        {props.children}
    </>);
};

export default HomeLayout;

这是我想解决的问题，我知道这是版本问题或其他问题，所以我将在此处添加package.json -->

{
  "name": "client",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.16.1",
    "@testing-library/react": "^12.1.2",
    "@testing-library/user-event": "^13.5.0",
    "react": "^17.0.2",
    "react-dom": "^17.0.2",
    "react-router-dom": "^5.3.0",
    "react-scripts": "5.0.0",
    "web-vitals": "^2.1.4"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "autoprefixer": "^10.4.2",
    "postcss": "^8.4.5",
    "tailwindcss": "^3.0.16"
  }
}

请帮我解决这个问题 目标 -> 渲染 Temp 组件。在 path ="/" 中使用默认的 HOC 。并在默认布局内。按照布局优先的方法，。

Answer 1

我看到的主要问题是您的 Route component 回调函数没有返回要在 HomeLayoutHOC 组件中呈现的任何内容。

const HomeLayoutHOC = ({ component: Component, ...rest }) => {
  return (
    <>
      <Route
        {...rest}
        component={(props) => {
          <HomeLayout> // <-- no JSX returned!!
            <Component {...props} />
          </HomeLayout>;
        }}
      />
    </>
  );
};

在此处添加 return 语句可让您的代码正常运行。

const HomeLayoutHOC = ({ component: Component, ...rest }) => {
  return (
    <>
      <Route
        {...rest}
        component={(props) => {
          return (
            <HomeLayout>
              <Component {...props} />
            </HomeLayout>
          );
        }}
      />
    </>
  );
};

我对@9​​87654330@ 不是真正的高阶组件的评论是关于它是一个包装器组件。 Wrapper 组件接受 props 并“包装”并渲染其他组件，而 HOC 是使用 React 组件并返回一个新的、增强的组件的高阶函数。您永远不会直接将 HOC 渲染为 JSX，而是将其传递给组件并渲染返回的组件。

HomeLayoutHOC 的 HOC 版本示例：

const withHomeLayout = (Component) => (props) => (
  <HomeLayout>
    <Component {...props} />
  </HomeLayout>
);

...

const HomeLayoutRoute = withHomeLayout(Route);

...

<HomeLayoutRoute path="/hoc" component={Temp} />