我的新 Reactjs 应用程序出现 404 错误，它是否在寻找 main.js 文件？

Question

这个应用程序应该呈现我在这里的内容 (/Users/ldco2016/Projects/reactquiz/src/components/App.jsx:

import React, {Component} from 'react';
import ReactDOM from 'react-dom';

class App extends Component{
    render(){
        return(
            <div>
                APP
            </div>
        )
    }
}

export default App

但我得到的是空白页面，Chrome 开发工具控制台告诉我：

GET http://localhost:8080/app/js/main.js 404 (Not Found)

我知道那是什么意思，但我不清楚它是在尝试查找我要呈现的页面还是 main.js 文件。

/Users/ldco2016/Projects/reactquiz/package.json:

{
  "name": "reactquiz",
  "version": "1.0.0",
  "description": "A Reactjs Quiz App",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Daniel Cortes",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "6.13.*",
    "babel-loader": "6.2.*",
    "webpack": "1.13.*"
  },
  "dependencies": {
    "react": "^15.3.1",
    "react-dom": "^15.3.1"
  }
}

/Users/ldco2016/Projects/reactquiz/app/index.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Reactjs Quiz</title>
</head>
<body>
    <div id="app"></div>

    <script src="js/main.js"></script>
</body>
</html>

ldco2016@DCortes-MacBook-Pro-3 ~/Projects/reactquiz/webpack.config.js:

module.export = {
    entry: [
        './src/index.js'
    ],
    output: {
        path: __dirname,
        filename: 'app/js/main.js'
    },
    module: {
        loaders: [{
            test: /\.jsx?$/,
            loader: 'babel',
            exclude: /node_modules/
        }]
    }

}

/Users/ldco2016/Projects/reactquiz/src/index.js:

import React from 'react';
import ReactDOM from 'react-dom';
import App from './components/App.jsx';

ReactDOM.render(
    <App />,
    document.getElementById('app')
);

Answer 1

您需要运行 webpack 来生成main.js 文件。首先在 package.json 中对文件进行两处更改，添加脚本 "start": "webpack --progress -p --config webpack.config.js --watch"，然后在 webpack.config.js 中将加载器更改为 babel-loader。

P.S. 可能不需要第二次更改。

package.json

{
  "name": "reactquiz",
  "version": "1.0.0",
  "description": "A Reactjs Quiz App",
  "main": "index.js",
  "scripts": {
    "start": "webpack --progress -p --config webpack.config.js --watch"
  },
  "author": "Daniel Cortes",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "6.13.*",
    "babel-loader": "6.2.*",
    "webpack": "1.13.*"
  },
  "dependencies": {
    "react": "^15.3.1",
    "react-dom": "^15.3.1"
  }
}

webpack.config.js

module.export = {
    entry: [
        './src/index.js'
    ],
    output: {
        path: __dirname,
        filename: 'app/js/main.js'
    },
    module: {
        loaders: [{
            test: /\.jsx?$/,
            loader: 'babel-loader',
            exclude: /node_modules/
        }]
    }

}

现在运行带有命令的 webpack

npm run start

现在打开你的本地主机，上面的应该可以工作了。

我的新 Reactjs 应用程序出现 404 错误，它是否在寻找 main.js 文件？

I am getting a 404 error on my new Reactjs app, is it looking for a main.js file?

javascript

reactjs

webpack

babel-core