webpack處理跨域問題

webpack跨域問題

webpack自己帶了express框架

1、配置代理proxy

let path = require('path');
let HtmlWebpackPlugin = require('html-webpack-plugin');
let {CleanWebpackPlugin} = require('clean-webpack-plugin');
// 以前的用法
// let CleanWebpackPlugin = require('clean-webpack-plugin');
let CopyWebpackPlugin = require('copy-webpack-plugin');
let webpack = require('webpack');

module.exports = {
    // 多入口
    mode: 'development',
    entry: {
        home: './src/index.js',
    },
    // devServer: {
    //     publicPath: '',
    //     proxy: {
    //         '/api/**': 'http://localhost:3000', // 配置了一個代理
    //         secure: false
    //     },
    // },
    devServer: {
         proxy: {
         // 凡是以/api開頭的請求，都轉化請求路徑
             '/api': {
                 target: 'http://localhost:4000',
                 pathRewrite: {'/api':''},
                 changeOrigin: true,
                 secure: false
             }
         }
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            }
        ]
    },
    devtool: 'cheap-module-eval-source-map',
    output: {
        // 這裏的 name代表 home， other
        filename: '[name].js',
        path: path.resolve(__dirname, 'dist')
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: "./index.html",
            filename: "index.html",
            chunks: [
                "home",
            ],
        }),
    ]
};

2、使用before

let path = require('path');
let HtmlWebpackPlugin = require('html-webpack-plugin');
let {CleanWebpackPlugin} = require('clean-webpack-plugin');
// 以前的用法
// let CleanWebpackPlugin = require('clean-webpack-plugin');
let CopyWebpackPlugin = require('copy-webpack-plugin');
let webpack = require('webpack');

module.exports = {
    // 多入口
    mode: 'development',
    entry: {
        home: './src/index.js',
    },
    devServer: {
        before(app){
            app.get('/user', (req, res) => {
                res.json({name: 'zhangfeng'});
            });
        },
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            }
        ]
    },
    devtool: 'cheap-module-eval-source-map',
    output: {
        // 這裏的 name代表 home， other
        filename: '[name].js',
        path: path.resolve(__dirname, 'dist')
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: "./index.html",
            filename: "index.html",
            chunks: [
                "home",
            ],
        }),
    ]
};

3、通過在服務端進行啓動webpack 端口就用服務器端口

express使用webpack-dev-middleware中間件

let express = require('express');

let app = express();

let webpack = require('webpack');
// 中間件
let middle = require('webpack-dev-middleware');
let config = require('./webpack.config');
let compiler = webpack(config);

app.use(middle(compiler));

console.log(1111111111111);

app.get('/user', (req, res) => {
    res.json({name: 'zhangfeng'});
});

app.get("*", function(request, response) {
    response.json({name: 'hahahahha'});
});

app.listen(4000);