Keine Komponente ist in HTML-Seite sichtbar, reagieren js

Question

Ich bin ein Anfänger in reagieren, ich habe versucht, eine Webseite zu erstellen, dafür habe ich eine neue react app https://github.com/facebookincubator/create-react-app diesem Link erstellt.

installierte auch einen webpack diesen Link:

https://www.davidmeents.com/blog/journey-into-react-part-2-creating-your-first-react-app/

Zuerst installiert reagieren

C:\Users\siddhi jambhale\Desktop\react-demo>npm install react --save 
my-app@0.1.0 C:\Users\siddhi jambhale\Desktop\react-demo 
`-- react@15.5.4 

Dann reagieren-Demo installiert

C:\Users\siddhi jambhale\Desktop\react-demo>npm install react-dom --save 
my-app@0.1.0 C:\Users\siddhi jambhale\Desktop\react-demo 
`-- react-dom@15.5.4 

Dann erstellt webpack.config.js

var webpack = require('webpack'); 

module.exports = { 
    context: __dirname, 
    entry: "./src/index.js", 
    module: { 
     loaders: [ 
      { 
       test: /\.js|.jsx?$/, 
       exclude: /(node_modules|bower_components)/, 
       loader: 'babel-loader', 
       query: { 
        presets: ['react', 'es2015', 'stage-2'], 
        plugins: ['react-html-attrs', 'transform-class-properties', 
         'transform-decorators-legacy'] 
       } 
      } 
     ] 
    }, 
    output: { 
     path: __dirname, 
     filename: "bundle.js" 
    } 
}; 

Dann installiert webpack ich eine Ausgabe wie diese:

C:\Users\siddhi jambhale\Desktop\react-demo>npm install webpack webpack-dev-server --save-dev 
my-app@0.1.0 C:\Users\siddhi jambhale\Desktop\react-demo 
+-- webpack@2.5.1 
| +-- acorn@5.0.3 
| +-- acorn-dynamic-import@2.0.2 
| | `-- acorn@4.0.11 
| +-- ajv@4.11.8 
| | +-- co@4.6.0 
| | `-- json-stable-stringify@1.0.1 
| | `-- jsonify@0.0.0 
| +-- ajv-keywords@1.5.1 
| +-- async@2.4.0 
| | `-- lodash@4.17.4 
| +-- enhanced-resolve@3.1.0 
| | `-- graceful-fs@4.1.11 
| +-- interpret@1.0.3 
| +-- json-loader@0.5.4 
| +-- json5@0.5.1 
| +-- loader-runner@2.3.0 
| +-- loader-utils@0.2.17 
| | +-- big.js@3.1.3 
| | `-- emojis-list@2.1.0 
| +-- memory-fs@0.4.1 
| | +-- errno@0.1.4 
| | | `-- prr@0.0.0 
| | `-- readable-stream@2.2.9 
| | +-- buffer-shims@1.0.0 
| | +-- core-util-is@1.0.2 
| | +-- isarray@1.0.0 
| | +-- process-nextick-args@1.0.7 
| | +-- string_decoder@1.0.0 
| | `-- util-deprecate@1.0.2 
| +-- mkdirp@0.5.1 
| | `-- minimist@0.0.8 
| +-- node-libs-browser@2.0.0 
| | +-- assert@1.4.1 
| | +-- browserify-zlib@0.1.4 
| | | `-- pako@0.2.9 
| | +-- buffer@4.9.1 
| | | +-- base64-js@1.2.0 
| | | `-- ieee754@1.1.8 
| | +-- console-browserify@1.1.0 
| | | `-- date-now@0.1.4 
| | +-- constants-browserify@1.0.0 
| | +-- crypto-browserify@3.11.0 
| | | +-- browserify-cipher@1.0.0 
| | | | +-- browserify-aes@1.0.6 
| | | | | `-- buffer-xor@1.0.3 
| | | | +-- browserify-des@1.0.0 
| | | | | `-- des.js@1.0.0 
| | | | `-- evp_bytestokey@1.0.0 
| | | +-- browserify-sign@4.0.4 
| | | | +-- bn.js@4.11.6 
| | | | +-- browserify-rsa@4.0.1 
| | | | +-- elliptic@6.4.0 
| | | | | +-- brorand@1.1.0 
| | | | | +-- hash.js@1.0.3 
| | | | | +-- hmac-drbg@1.0.1 
| | | | | `-- minimalistic-crypto-utils@1.0.1 
| | | | `-- parse-asn1@5.1.0 
| | | | `-- asn1.js@4.9.1 
| | | +-- create-ecdh@4.0.0 
| | | +-- create-hash@1.1.3 
| | | | +-- cipher-base@1.0.3 
| | | | +-- ripemd160@2.0.1 
| | | | | `-- hash-base@2.0.2 
| | | | `-- sha.js@2.4.8 
| | | +-- create-hmac@1.1.6 
| | | | `-- safe-buffer@5.0.1 
| | | +-- diffie-hellman@5.0.2 
| | | | `-- miller-rabin@4.0.0 
| | | +-- pbkdf2@3.0.12 
| | | +-- public-encrypt@4.0.0 
| | | `-- randombytes@2.0.3 
| | +-- domain-browser@1.1.7 
| | +-- events@1.1.1 
| | +-- https-browserify@0.0.1 
| | +-- os-browserify@0.2.1 
| | +-- path-browserify@0.0.0 
| | +-- process@0.11.10 
| | +-- punycode@1.4.1 
| | +-- querystring-es3@0.2.1 
| | +-- stream-browserify@2.0.1 
| | +-- stream-http@2.7.1 
| | | +-- builtin-status-codes@3.0.0 
| | | +-- to-arraybuffer@1.0.1 
| | | `-- xtend@4.0.1 
| | +-- string_decoder@0.10.31 
| | +-- timers-browserify@2.0.2 
| | +-- tty-browserify@0.0.0 
| | +-- url@0.11.0 
| | | +-- punycode@1.3.2 
| | | `-- querystring@0.2.0 
| | +-- util@0.10.3 
| | | `-- inherits@2.0.1 
| | `-- vm-browserify@0.0.4 
| | `-- indexof@0.0.1 
| +-- source-map@0.5.6 
| +-- supports-color@3.2.3 
| | `-- has-flag@1.0.0 
| +-- tapable@0.2.6 
| +-- uglify-js@2.8.23 
| | +-- uglify-to-browserify@1.0.2 
| | `-- yargs@3.10.0 
| | +-- camelcase@1.2.1 
| | +-- cliui@2.1.0 
| | | +-- center-align@0.1.3 
| | | | +-- align-text@0.1.4 
| | | | | +-- longest@1.0.1 
| | | | | `-- repeat-string@1.6.1 
| | | | `-- lazy-cache@1.0.4 
| | | +-- right-align@0.1.3 
| | | `-- wordwrap@0.0.2 
| | `-- window-size@0.1.0 
| +-- watchpack@1.3.1 
| +-- webpack-sources@0.2.3 
| | `-- source-list-map@1.1.2 
| `-- yargs@6.6.0 
| +-- camelcase@3.0.0 
| +-- cliui@3.2.0 
| | `-- wrap-ansi@2.1.0 
| +-- decamelize@1.2.0 
| +-- get-caller-file@1.0.2 
| +-- os-locale@1.4.0 
| | `-- lcid@1.0.0 
| | `-- invert-kv@1.0.0 
| +-- read-pkg-up@1.0.1 
| | +-- find-up@1.1.2 
| | | `-- path-exists@2.1.0 
| | `-- read-pkg@1.1.0 
| | +-- load-json-file@1.1.0 
| | | +-- parse-json@2.2.0 
| | | | `-- error-ex@1.3.1 
| | | | `-- is-arrayish@0.2.1 
| | | +-- pify@2.3.0 
| | | `-- strip-bom@2.0.0 
| | | `-- is-utf8@0.2.1 
| | +-- normalize-package-data@2.3.8 
| | | +-- hosted-git-info@2.4.2 
| | | +-- is-builtin-module@1.0.0 
| | | | `-- builtin-modules@1.1.1 
| | | +-- semver@5.3.0 
| | | `-- validate-npm-package-license@3.0.1 
| | | +-- spdx-correct@1.0.2 
| | | | `-- spdx-license-ids@1.2.2 
| | | `-- spdx-expression-parse@1.0.4 
| | `-- path-type@1.1.0 
| +-- require-directory@2.1.1 
| +-- require-main-filename@1.0.1 
| +-- set-blocking@2.0.0 
| +-- string-width@1.0.2 
| | +-- code-point-at@1.1.0 
| | `-- is-fullwidth-code-point@1.0.0 
| | `-- number-is-nan@1.0.1 
| +-- which-module@1.0.0 
| +-- y18n@3.2.1 
| `-- yargs-parser@4.2.1 
|  `-- camelcase@3.0.0 
`-- webpack-dev-server@2.4.5 
    +-- ansi-html@0.0.7 
    +-- chokidar@1.7.0 
    | +-- anymatch@1.3.0 
    | | `-- arrify@1.0.1 
    | +-- async-each@1.0.1 
    | +-- glob-parent@2.0.0 
    | +-- inherits@2.0.3 
    | +-- is-binary-path@1.0.1 
    | | `-- binary-extensions@1.8.0 
    | +-- is-glob@2.0.1 
    | | `-- is-extglob@1.0.0 
    | +-- path-is-absolute@1.0.1 
    | `-- readdirp@2.1.0 
    | +-- minimatch@3.0.4 
    | | `-- brace-expansion@1.1.7 
    | | +-- balanced-match@0.4.2 
    | | `-- concat-map@0.0.1 
    | `-- set-immediate-shim@1.0.1 
    +-- compression@1.6.2 
    | +-- accepts@1.3.3 
    | | `-- negotiator@0.6.1 
    | +-- bytes@2.3.0 
    | +-- compressible@2.0.10 
    | | `-- mime-db@1.27.0 
    | +-- debug@2.2.0 
    | | `-- ms@0.7.1 
    | +-- on-headers@1.0.1 
    | `-- vary@1.1.1 
    +-- connect-history-api-fallback@1.3.0 
    +-- express@4.15.2 
    | +-- array-flatten@1.1.1 
    | +-- content-disposition@0.5.2 
    | +-- content-type@1.0.2 
    | +-- cookie@0.3.1 
    | +-- cookie-signature@1.0.6 
    | +-- debug@2.6.1 
    | | `-- ms@0.7.2 
    | +-- depd@1.1.0 
    | +-- encodeurl@1.0.1 
    | +-- escape-html@1.0.3 
    | +-- etag@1.8.0 
    | +-- finalhandler@1.0.2 
    | | +-- debug@2.6.4 
    | | | `-- ms@0.7.3 
    | | `-- unpipe@1.0.0 
    | +-- fresh@0.5.0 
    | +-- merge-descriptors@1.0.1 
    | +-- methods@1.1.2 
    | +-- on-finished@2.3.0 
    | | `-- ee-first@1.1.1 
    | +-- parseurl@1.3.1 
    | +-- path-to-regexp@0.1.7 
    | +-- proxy-addr@1.1.4 
    | | +-- forwarded@0.1.0 
    | | `-- ipaddr.js@1.3.0 
    | +-- qs@6.4.0 
    | +-- range-parser@1.2.0 
    | +-- send@0.15.1 
    | | +-- debug@2.6.1 
    | | +-- destroy@1.0.4 
    | | +-- http-errors@1.6.1 
    | | `-- ms@0.7.2 
    | +-- serve-static@1.12.1 
    | +-- setprototypeof@1.0.3 
    | +-- statuses@1.3.1 
    | +-- type-is@1.6.15 
    | | `-- media-typer@0.3.0 
    | `-- utils-merge@1.0.0 
    +-- html-entities@1.2.1 
    +-- http-proxy-middleware@0.17.4 
    | +-- http-proxy@1.16.2 
    | | +-- eventemitter3@1.2.0 
    | | `-- requires-port@1.0.0 
    | +-- is-glob@3.1.0 
    | | `-- is-extglob@2.1.1 
    | `-- micromatch@2.3.11 
    | +-- arr-diff@2.0.0 
    | | `-- arr-flatten@1.0.3 
    | +-- array-unique@0.2.1 
    | +-- braces@1.8.5 
    | | +-- expand-range@1.8.2 
    | | | `-- fill-range@2.2.3 
    | | | +-- is-number@2.1.0 
    | | | +-- isobject@2.1.0 
    | | | `-- randomatic@1.1.6 
    | | +-- preserve@0.2.0 
    | | `-- repeat-element@1.1.2 
    | +-- expand-brackets@0.1.5 
    | | `-- is-posix-bracket@0.1.1 
    | +-- extglob@0.3.2 
    | +-- filename-regex@2.0.1 
    | +-- kind-of@3.2.0 
    | | `-- is-buffer@1.1.5 
    | +-- normalize-path@2.1.1 
    | | `-- remove-trailing-separator@1.0.1 
    | +-- object.omit@2.0.1 
    | | +-- for-own@0.1.5 
    | | | `-- for-in@1.0.2 
    | | `-- is-extendable@0.1.1 
    | +-- parse-glob@3.0.4 
    | | +-- glob-base@0.3.0 
    | | `-- is-dotfile@1.0.2 
    | `-- regex-cache@0.4.3 
    |  +-- is-equal-shallow@0.1.3 
    |  `-- is-primitive@2.0.0 
    +-- opn@4.0.2 
    | `-- pinkie-promise@2.0.1 
    | `-- pinkie@2.0.4 
    +-- portfinder@1.0.13 
    | `-- async@1.5.2 
    +-- serve-index@1.8.0 
    | +-- batch@0.5.3 
    | +-- http-errors@1.5.1 
    | | `-- setprototypeof@1.0.2 
    | `-- mime-types@2.1.15 
    +-- sockjs@0.3.18 
    | +-- faye-websocket@0.10.0 
    | | `-- websocket-driver@0.6.5 
    | | `-- websocket-extensions@0.1.1 
    | `-- uuid@2.0.3 
    +-- sockjs-client@1.1.2 
    | +-- eventsource@0.1.6 
    | | `-- original@1.0.0 
    | | `-- url-parse@1.0.5 
    | |  `-- querystringify@0.0.4 
    | +-- faye-websocket@0.11.1 
    | +-- json3@3.3.2 
    | `-- url-parse@1.1.9 
    | `-- querystringify@1.0.0 
    +-- spdy@3.4.4 
    | +-- handle-thing@1.2.5 
    | +-- http-deceiver@1.2.7 
    | +-- select-hose@2.0.0 
    | `-- spdy-transport@2.0.18 
    | +-- hpack.js@2.1.6 
    | +-- obuf@1.1.1 
    | `-- wbuf@1.7.2 
    |  `-- minimalistic-assert@1.0.0 
    +-- strip-ansi@3.0.1 
    | `-- ansi-regex@2.1.1 
    `-- webpack-dev-middleware@1.10.2 
    `-- mime@1.3.4 

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules\chokidar\node_modules\fsevents): 
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.1: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"}) 

Aber ich kann nicht die bundle.js erzeugt sehen.

Und wenn ich index.html laufen sehe ich nichts als nur eine leere Seite.

Index.HTML

<!doctype html> 
<html lang="en"> 
    <head> 
    <meta charset="utf-8"> 
    <meta name="viewport" content="width=device-width, initial-scale=1"> 
    <!-- 
     Notice the use of %PUBLIC_URL% in the tag above. 
     It will be replaced with the URL of the `public` folder during the build. 
     Only files inside the `public` folder can be referenced from the HTML. 

     Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will 
     work correctly both with client-side routing and a non-root public URL. 
     Learn how to configure a non-root public URL by running `npm run build`. 
    --> 
    <title>React App</title> 
    </head> 
    <body> 

    <div id="root"></div> 
    <!-- 
     This HTML file is a template. 
     If you open it directly in the browser, you will see an empty page. 

     You can add webfonts, meta tags, or analytics to this file. 
     The build step will place the bundled scripts into the <body> tag. 

     To begin the development, run `npm start`. 
     To create a production bundle, use `npm run build`. 
    --> 

<script src="/my-app/src/App.js"></script> 
    </body> 
</html> 

App.js

import React, { Component } from 'react'; 
import logo from './logo.svg'; 
import './App.css'; 

class App extends Component { 
    render() { 
    return (
     <div className="App"> 
     <div className="App-header"> 
      <img src={logo} className="App-logo" alt="logo" /> 
      <h2>Welcome to React</h2> 
     </div> 
     <p className="App-intro"> 
      To get started, edit <code>src/App.js</code> and save to reload. 
     </p> 
     </div> 
    ); 
    } 
} 
ReactDOM.render(<App />, document.getElementById('root')) 
export default App; 

package.json

{ 
    "name": "my-app", 
    "version": "0.1.0", 
    "private": true, 
    "dependencies": { 
    "react": "^15.5.4", 
    "react-dom": "^15.5.4" 
    }, 
    "devDependencies": { 
    "babel-loader": "^7.0.0", 
    "babel-preset-es2015": "^6.24.1", 
    "babel-preset-react": "^6.24.1", 
    "babel-preset-stage-2": "^6.24.1", 
    "react-scripts": "0.9.5", 
    "webpack": "^2.5.1", 
    "webpack-dev-server": "^2.4.5" 
    }, 
    "scripts": { 
    "start": "react-scripts start", 
    "build": "react-scripts build", 
    "dev": "webpack-dev-server --inline --hot", 
    "eject": "react-scripts eject" 
    } 
} 

Was ist los hier los? Bitte helfen Sie. Danke ..

EDIT: Ich habe versucht, die webpack ich Fehler zu laufen bekommen:

C:\Users\siddhi jambhale\Desktop\react-demo>npm run webpack 
npm ERR! Windows_NT 10.0.14393 
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "webpack" 
npm ERR! node v7.10.0 
npm ERR! npm v4.2.0 

npm ERR! missing script: webpack 
npm ERR! 
npm ERR! If you need help, you may report this error at: 
npm ERR!  <https://github.com/npm/npm/issues> 

npm ERR! Please include the following file with any support request: 
npm ERR!  C:\Users\siddhi jambhale\AppData\Roaming\npm-cache\_logs\2017-05-13T05_35_36_577Z-debug.log 

Und bundle.js nicht schaffen, wenn ich entweder die webpack installiert oder ausgeführt werden.

index.js

import React from 'react'; 
import ReactDOM from 'react-dom'; 
import App from './App'; 
import './index.css'; 

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

Answer 1

Sie haben vergessen, die bundle.js Datei in index.html, schreiben Sie es wie folgt umfassen:

<body> 
    <div id="root"></div> 
    <script src="bundle.js"></script> 
</body> 

Grund: Überprüfen Sie die webpack config file:

output: { 
    path: __dirname, 
    filename: "bundle.js" 
} 

Wenn Sie laufen die webpack, es erstellt eine Ausgabedatei bundle.js, die den gesamten Code enthält, müssen Sie diese Datei in index.html enthalten.