新版create-react-app+webpack4跨域

src/setupProxy.js  创建文件

const proxy = require('http-proxy-middleware');

module.exports = function(app) {
  app.use(proxy('/api', { 
       target: 'https://www.easy-mock.com/api/' ,
       secure: false,
       changeOrigin: true,
       pathRewrite: {
        "^/api": "/"
       },
      //  http://www.easy-mock.com'
       // cookieDomainRewrite: "http://localhost:3000"
    }));
};

注意api前面千万别加/,/api/****是错的,还要注意请求的接口是post还是Get

const common='api/mock/5d50cfdbc7a4ef40e1081602/sy';
export const sy_userIndex =  data  => ly_req(`/${common}/v1/userBaseinfoList`,data,'GET');