在html页面中看不到任何组件，对js做出反应
[英]No component is visible in html page, react js
问题描述
我是react的初学者，我尝试创建一个网页，为此，我在此链接之后创建了一个新的react应用https://github.com/facebookincubator/create-react-app 。
还通过以下链接安装了webpack：
https://www.davidmeents.com/blog/journey-into-react-part-2-creating-your-first-react-app/
首先安装反应
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
然后安装react-demo
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
然后创建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"
}
};
然后安装webpack，我得到这样的输出：
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"})
但是我看不到bundle.js生成。
而且，如果我运行index.html，则只能看到空白页，什么也看不到。
的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;
的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"
}
}
怎么了 请帮忙。 谢谢..
编辑：我试图运行webpack我收到错误：
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
当我安装或运行webpack时，bundle.js并未创建。
index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import './index.css';
ReactDOM.render(
<App />,
document.getElementById('root')
);
1 个解决方案
解决方案1
0 2017-05-13 05:31:30
您忘记将bundle.js文件包含在index.html ，应这样编写：
<body>
<div id="root"></div>
<script src="bundle.js"></script>
</body>
原因：检查webpack config file ：
output: {
path: __dirname,
filename: "bundle.js"
}
当您运行webpack ，它将创建一个包含所有代码的输出文件bundle.js ，您需要将该文件包含在index.html 。
React Js 组件构造函数和可见状态
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