vue配置文件实现代理v2版本的方法

development/config/config.local
development/config/config.*.local
development/config 下的config.development.dev
{
  "/api":"http://serverurl"
 }
development/config 下的config.owndev.dev

{
  "/api/login":"http://localhost:8080",
  "/api/register":"http://localhost:8081"
}

"devDependencies": {
 "cross-env": "^5.2.0"
 }

"script":{
  "serve": "cross-env BUILD_ENV=development vue-cli-service serve",
  "owndev": "cross-env BUILD_ENV=owndev vue-cli-service serve",
}

var path = require('path'); //系统路径模块
var fs = require('fs'); //文件模块
const defaultProxy = {
 "/api":"http://serverUrl"
};
//根据当前的运行环境判断走哪个配置
const DEVELOPMENT = "development"
let currentEnv = process.env.BUILD_ENV?process.env.BUILD_ENV:DEVELOPMENT
let configPath = `config/config.${currentEnv}.local`
let filePath = path.join(__dirname, configPath); //文件路径，__dirname为当前运行js文件的目录
let proxyContent = null;
//读取json文件,异步
/*fs.readFile(filePath, 'utf-8', function(err, data) {
 if (!err) {
  proxyContent = data;
 } 
});*/
//将json字符串转化为json对象
try{
proxyContent = JSON.parse(fs.readFileSync(filePath,'utf-8'))
}catch(e){
proxyContent = defaultProxy
}
if(proxyContent == null){
 proxyContent = defaultProxy
}
let proxys = {}
//遍历所有的配置代理，对应不同的服务器
Object.getOwnPropertyNames(proxyContent).forEach(function (key) {
 let targetPath = proxyContent[key]
 let proxyItem = {};
 proxyItem.target = targetPath;
 proxyItem.ws = true;
 proxyItem.changeOrigin = true;
 proxyItem.pathRewrite = {}
 proxyItem.pathRewrite[`^${key}`] = '/'
 proxys[key] = proxyItem
});
module.exports = proxys

let proxy = require('./development/proxy/proxy')
let config = {
 publicPath:"/" ,
 devServer: {
  port: 8080,
  proxy:proxy
 }
}
module.exports = config