开发
这里只适用于开发环境,不要在生产环境使用
使用source map
在使用webpack打包源代码时,如果抱错问题跟踪会指向bundle.js,不会具体的指向某一个js文件。使用inline-source-map,则会帮助我们查看问题在哪个文件中
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
module.exports = {
entry: {
app: './src/index.js',
print: './src/print.js'
},
+ devtool: 'inline-source-map',
plugins: [
new CleanWebpackPlugin(['dist']),
new HtmlWebpackPlugin({
title: 'Development'
})
],
output: {
filename: '[name].bundle.js',
path: path.resolve(__dirname, 'dist')
}
};
使用webpack-dev-server
安装: npm install --save-dev webpack-dev-server
webpack-dev-server 能够实现实时重新加载
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
module.exports = {
entry: {
app: './src/index.js',
print: './src/print.js'
},
devtool: 'inline-source-map',
+ devServer: {
+ contentBase: './dist'
+ },
plugins: [
new CleanWebpackPlugin(['dist']),
new HtmlWebpackPlugin({
title: 'Development'
})
],
output: {
filename: '[name].bundle.js',
path: path.resolve(__dirname, 'dist')
}
};
在package.json中添加脚本
{
"name": "development",
"version": "1.0.0",
"description": "",
"main": "webpack.config.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
+ "start": "webpack-dev-server --open",
"build": "webpack"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"clean-webpack-plugin": "^0.1.16",
"css-loader": "^0.28.4",
"csv-loader": "^2.1.1",
"file-loader": "^0.11.2",
"html-webpack-plugin": "^2.29.0",
"style-loader": "^0.18.2",
"webpack": "^3.0.0",
"xml-loader": "^1.2.1"
}
}
上面的配置会在localhost:8080下建立服务,将dist目录下的文件作为可访问文件
现在在命令行中运行npm start,会自动在浏览器中打开页面,在更改代码后,会自动重新加载编译后的代码
使用webpack-dev-middleware
webpack-dev-middleware是一个容器,可以把webpack处理后的文件传递给一个服务器,webpack-dev-server在内部使用了它,作为一个单独的包来使用,可以进行更多自定义设置
webpack.config.js
const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
module.exports = {
entry: {
app: './src/index.js',
print: './src/print.js'
},
devtool: 'inline-source-map',
plugins: [
new CleanWebpackPlugin(['dist']),
new HtmlWebpackPlugin({
title: 'Output Management'
})
],
output: {
filename: '[name].bundle.js',
path: path.resolve(__dirname, 'dist'),
+ publicPath: '/'
}
};
在项目根目录下新建server.js
const express = require('express');
const webpack = require('webpack');
const webpackDevMiddleware = require('webpack-dev-middleware');
const app = express();
const config = require('./webpack.config.js');
const compiler = webpack(config);
// Tell express to use the webpack-dev-middleware and use the webpack.config.js
// configuration file as a base.
app.use(webpackDevMiddleware(compiler, {
publicPath: config.output.publicPath
}));
// Serve the files on port 3000.
app.listen(3000, function () {
console.log('Example app listening on port 3000!\n');
});
package.json中添加脚本
{
"name": "development",
"version": "1.0.0",
"description": "",
"main": "webpack.config.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"watch": "webpack --watch",
"start": "webpack-dev-server --open",
+ "server": "node server.js",
"build": "webpack"
},
"keywords": [],
"author": "",
"license": "ISC",
"devDependencies": {
"clean-webpack-plugin": "^0.1.16",
"css-loader": "^0.28.4",
"csv-loader": "^2.1.1",
"express": "^4.15.3",
"file-loader": "^0.11.2",
"html-webpack-plugin": "^2.29.0",
"style-loader": "^0.18.2",
"webpack": "^3.0.0",
"webpack-dev-middleware": "^1.12.0",
"xml-loader": "^1.2.1"
}
}
执行npm run server ,dist目录被删除,命令行输出:Example app listening on port 3000!
打开浏览器跳转到 http://localhost:3000,程序已经运行