一直不清楚做项目的时候前台怎么和后台进行通信，虽然知道可以通过ajax请求后台数据，但是不知道在具体项目中怎么运用的，正好自己搭项目的时候也遇到了这个问题，简单记录一下。
起因是webpack可以自己指定port(本地代码，host为http://localhost:port)，并将文件打包，运行在指定的host上面。同时，后台也指定了程序运行的端口号。若前台指定的端口号和后台一样，肯定会有错误，若指定不同端口号，请求的url又跨域了，此时的做法是在webpack配置上加上一个devserver配置，加上一个代理
1 | devServer: { |
| 配置 | 说明 |
|---|---|
| proxy | 请求到 /api/v1 会被代理请求到http://localhost:8025/api/v1 |
| contentBase | 告诉服务器从哪个目录内容提供文件 |
| compress | 一切服务都启用gzip压缩 |
| historyApiFallback | 默认禁用404响应被替代为index.html |
| hot | 启用webpack的模块热加载功能（必须有 webpack.HotModuleReplacementPlugin 才能完全启用 HMR） |
| port | 指定要监听请求的端口号 |
详细配置见 devserver
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162const path = require('path');
const webpack = require('webpack');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const HtmlwebpackPlugin = require('html-webpack-plugin');
const HtmlWebpackIncludeAssetsPlugin = require('html-webpack-include-assets-plugin');
const OpenBrowerPlugin = require('open-browser-webpack-plugin');
const port = 8026;
const host = `http://localhost:${port}/`;
module.exports = {
entry: {
bundle: './src/index.js',
vendor: [
'classnames',
'redux',
'redux-thunk',
'redux-immutable',
'redux-actions',
'react-router',
'react-router-dom',
'history/createBrowserHistory'
]
},
output: {
path: path.resolve(__dirname, "dist"),
filename: 'js/[name].js',
chunkFilename: 'lib/[name].min.js',
publicPath: host
},
resolve: {
modules: [
"node_modules",
path.resolve(__dirname, "src")
],
extensions: [".js", ".jsx", ".json", ".css", ".scss"]
},
mode: 'development',
devtool: 'eval-source-map',
devServer: {
contentBase: './src',
historyApiFallback: true,
inline: true,
open: true,
hot: true,
compress: true,
port: port
},
module: {
rules: [{
test: /\.jsx?$/,
use: {
loader: 'babel-loader',
query: {
presets: ['react', 'es2017'],
plugins: ['transform-object-rest-spread', "syntax-dynamic-import"]
}
},
exclude: /node_modules/
},{
test: /\.scss$/,
use: ['style-loader', 'css-loader?modules', {
loader: 'postcss-loader',
options: {
plugins: () => [
require('autoprefixer')({ browsers: ['last 10 Chrome versions', 'last 5 Firefox versions', 'Safari >= 6', 'ie > 8'] })
]
}
}, 'sass-loader']
},{
test: /\.less$/,
use: ['style-loader', 'css-loader', {
loader: 'less-loader',
options: {
modifyVars: {
"primary-color": "#169BD5",
"link-color": "#169BD5"
},
javascriptEnabled: true
}
}]
},{
test: /\.css$/,
use: ['style-loader', 'css-loader']
},{
test: /\.(?:png|jpg|gif)/,
loader:'url-loader?limit=8192&name=image/[hash].[ext]'
},{
test: /\.svg$/,
loader: 'svg-url-loader'
}]
},
devServer: {
proxy: {
'/api/v1': 'http://localhost:8025',
},
contentBase: [path.join(__dirname, "dist")],
compress: true,
historyApiFallback: true,
hot: true,
port: port
},
plugins: [
// new webpack.optimize.CommonsChunkPlugin({
// names: ['vendor'],
// filename: 'lib/[name].min.js',
// }),
new webpack.optimize.SplitChunksPlugin({
cacheGroups: {
commons: {
chunks: 'initial',
minChunks: 2,
maxInitialRequetst: 5,
minSize: 0
},
vendor: {
test: /node_modules/,
chunks: 'initial',
name: 'vendor',
priority: 10,
enforce: true
}
}
}),
new CopyWebpackPlugin([{
from: 'node_modules/antd/dist/antd.min.js',
to: '/lib'
},{
from: 'node_modules/react/cjs/react.development.js',
to: '/lib'
},{
from: 'node_modules/react-dom/cjs/react-dom.development.js',
to: '/lib'
}]),
new HtmlwebpackPlugin({
filename: 'index.html',
template: 'src/index.ejs',
title: 'RShare'
}),
new HtmlWebpackIncludeAssetsPlugin({
assets: [
'lib/react-dom.development.js',
'lib/react.development.js',
'lib/antd.min.js'
],
append: false
}),
new OpenBrowerPlugin({
url: host
}),
]
}