vue设置代理解决跨域问题

原理：通过伪造请求使得http请求为同源的，然后将同源的请求发送到反向代理服务器上，由反向代理服务器去请求真正的url，这样就绕过直接请求真正的url导致跨域问题。

贴代码

config/index.js

'use strict'
// Template version: 1.3.1
// see http://vuejs-templates.github.io/webpack for documentation.

const path = require('path')
var proxyConfig = require('./proxyConfig');

module.exports = {
  dev: {

    // Paths
    env: require('./dev.env'),
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    // proxyTable: {},
    proxyTable: proxyConfig.proxy,

    // Various Dev Server settings
    host: '0.0.0.0', // can be overwritten by process.env.HOST
    port: 3000, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
    autoOpenBrowser: false,
    errorOverlay: true,
    notifyOnErrors: true,
    poll: false, // https://webpack.js.org/configuration/dev-server/#devserver-watchoptions-


    /**
     * Source Maps
     */

    // https://webpack.js.org/configuration/devtool/#development
    devtool: 'cheap-module-eval-source-map',

    // If you have problems debugging vue-files in devtools,
    // set this to false - it *may* help
    // https://vue-loader.vuejs.org/en/options.html#cachebusting
    cacheBusting: true,

    cssSourceMap: false
  },

  build: {
    // Template for index.html
    index: path.resolve(__dirname, '../dist/index.html'),

    // Paths
    assetsRoot: path.resolve(__dirname, '../dist'),
    assetsSubDirectory: 'static',
    assetsPublicPath: './',

    /**
     * Source Maps
     */

    productionSourceMap: false,
    // https://webpack.js.org/configuration/devtool/#production
    devtool: '#source-map',

    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],

    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report
  }
}

自定义的js文件config/proxyConfig.js

module.exports = {
  proxy: {
    '/': {    //将www.exaple.com印射为/apis
      target: 'http://172.16.3.19:8080',  // 接口域名
      secure: false,  // 如果是https接口，需要配置这个参数
      changeOrigin: true,  //是否跨域
      /*pathRewrite: {
        '^/api': ''   //需要rewrite的,
      }*/
    }
  }
}

或者直接写在config/index.js上