如果你跟我一样是从APP开发转的react-native，没有写过html的经验，但是想把你的项目在web上运行,或者有一些html的需求,比如分享APP的某个页面，那么这个库react-native-web可以帮助到你。
附上github地址
https://github.com/necolas/react-native-web
现在已经有很多rn的第三方组件都已经支持了web端，比如react-navigation
https://reactnavigation.org/docs/getting-started
蚂蚁金服的UI库antd
https://rn.mobile.ant.design/docs/react/introduce-cn
在使用之前，需要先学习一下webpack的知识
下面说步骤
1、新建一个空的RN项目，我的RN版本是0.63.3，修改package.json，已经加入了mobx相关依赖
{
"name": "rn_web01",
"version": "0.0.1",
"private": true,
"scripts": {
"android": "react-native run-android",
"ios": "react-native run-ios",
"start": "react-native start",
"test": "jest",
"lint": "eslint .",
"server": "webpack-dev-server --config web/webpack.config.js --port 8090 --open "
},
"dependencies": {
"react": "16.13.1",
"react-dom": "^16.14.0",
"react-native": "0.63.3",
"react-native-web": "^0.14.3"
},
"devDependencies": {
"@babel/core": "^7.10.2",
"@babel/plugin-proposal-class-properties": "^7.10.1",
"@babel/plugin-proposal-decorators": "^7.2.3",
"@babel/plugin-transform-runtime": "^7.2.0",
"@babel/preset-env": "^7.10.3",
"@babel/preset-react": "^7.10.1",
"@babel/preset-stage-0": "^7.8.3",
"@babel/runtime": "^7.10.2",
"@react-native-community/eslint-config": "^1.1.0",
"assets-webpack-plugin": "^5.0.2",
"babel-jest": "^26.0.1",
"babel-loader": "^8.1.0",
"copy-webpack-plugin": "^6.0.2",
"css-loader": "^3.6.0",
"eslint": "^7.2.0",
"file-loader": "^6.0.0",
"http-proxy-middleware": "^1.0.4",
"jest": "^26.0.1",
"metro-react-native-babel-preset": "^0.59.0",
"react-test-renderer": "16.11.0",
"style-loader": "^1.2.1",
"url-loader": "^4.1.0",
"webpack": "^4.43.0",
"webpack-cli": "^3.3.12",
"webpack-dev-server": "^3.11.0",
"webpack-node-externals": "^1.7.2"
},
"jest": {
"preset": "react-native"
}
}
2、新建web入口index.web.js文件
/**
* @format
*/
import {AppRegistry} from 'react-native';
import App from './src/App';
// import App from './src/Router'
import {name as appName} from './app.json';
AppRegistry.registerComponent(appName, () => App);
AppRegistry.runApplication(appName,{
initialProps:{},
rootTag:document.getElementById('root')
})
3、新建web目录
目录结构如下
image.png
其中web->public->index.html代码如下,fastclick是antd库需要的，不需要的话可以不加
<!DOCTYPE html>
<html lang="en" style="height:100%">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>rn-web-demo</title>
<script src="https://as.alipayobjects.com/g/component/fastclick/1.0.6/fastclick.js"></script>
<script>
if ('addEventListener' in document) {
document.addEventListener('DOMContentLoaded', function() {
FastClick.attach(document.body);
}, false);
}
if(!window.Promise) {
document.writeln('<script src="https://as.alipayobjects.com/g/component/es6-promise/3.2.2/es6-promise.min.js"'+'>'+'<'+'/'+'script>');
}
</script>
</head>
<body style="height:100%;touch-action: none">
<div id='root' style="display:flex;height:100%">
</div>
<script type="text/javascript" src="main.bundle.js"></script>
</body>
</html>
webpack.config.js代码如下
const webpack = require('webpack')
const path = require('path');
const appDirectory = path.resolve(__dirname, '../')
const CopyPlugin = require('copy-webpack-plugin')
const babelLoaderConfiguration = {
test: /(\.jsx|\.js)$/,
include: [
path.resolve(appDirectory, 'src'),
path.resolve(appDirectory, 'index.web.js'),
],
use: {
loader: 'babel-loader',
options: {
cacheDirectory: false,
presets: ["@babel/preset-env", "@babel/preset-react", "module:metro-react-native-babel-preset"],
plugins: [
["@babel/plugin-proposal-decorators", { "legacy": true }],
[require("@babel/plugin-proposal-class-properties"), { "loose": false }],
]
},
},
}
const imageLoaderConfiguration = {
test: /\.(gif|jpe?g|png|svg)$/,
use: {
loader: 'url-loader',
options: {
limit:1,
name: '/images/[name].[ext]',
},
},
}
const htmlLoaderConfiguration = {
test: /\.html$/,
use: {
loader: 'html-loader'
}
}
const cssLoaderConfiguration = {
test: /\.css|\.less$/,
use: ['style-loader',
'css-loader'],
}
module.exports = {
mode: 'development',
// mode: 'production',
entry: path.resolve(appDirectory, 'index.web.js'),
// devtool: 'eval-source-map',
devtool: 'false',
output: {
filename: '[name].bundle.js',
path: path.resolve(appDirectory, './web/public'),
},
devServer: {
contentBase: path.join(__dirname, 'public'),
historyApiFallback: true,
inline: true,
hot: true,
progress: true,
proxy:{
'/api/*':{
target:'https://www.doutuimei.com',
changeOrigin:true,
}
}
},
module: {
rules: [
babelLoaderConfiguration,
cssLoaderConfiguration,
imageLoaderConfiguration,
htmlLoaderConfiguration,
]
},
plugins: [
// new webpack.HotModuleReplacementPlugin(),
new CopyPlugin({
patterns:[
{
from:path.resolve(appDirectory,'src/images') ,
to:path.resolve(appDirectory, './web/public/images')
}
]
})
],
resolve: {
extensions: ['.web.js', '.js'],
alias: {
'react-native$': 'react-native-web',
},
},
performance: {
hints: false
}
}
此时已经完成了基本配置，下面可以尝试一下运行了
src目录下创建App.js文件
import React from 'react';
import {
SafeAreaView,
StyleSheet,
ScrollView,
View,
Text,
StatusBar,
Image
} from 'react-native';
const App: () => React$Node = () => {
return (
<View style={styles.container}>
<Image source={'../images/cat.jpg'} style={{width:100,height:100}}/>
<Text>Hello,react native web</Text>
</View>
);
};
const styles = StyleSheet.create({
container:{
flex:1,justifyContent:'center',alignItems:'center'
}
});
export default App;
在项目目录中执行yarn server即可在浏览器中打开了，
image.png
如果调试好没问题，要上传到服务器，需要先修改webpack.config.js中的mode为production,然后再打包：cd到web目录，输入webpack指令，然后会生成main.bundle.js文件,拷贝src/images文件夹到public/images文件夹
image.png
把public文件夹压缩丢给后台就可以了。
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