fix: fixed mock server (#541)

vue.config.js

@@ -36,18 +36,7 @@ module.exports = {
       warnings: false,
       errors: true
     },
-    proxy: {
-      // change xxx-api/login => mock/login
-      // detail: https://cli.vuejs.org/config/#devserver-proxy
-      [process.env.VUE_APP_BASE_API]: {
-        target: `http://127.0.0.1:${port}/mock`,
-        changeOrigin: true,
-        pathRewrite: {
-          ['^' + process.env.VUE_APP_BASE_API]: ''
-        }
-      }
-    },
-    after: require('./mock/mock-server.js')
+    before: require('./mock/mock-server.js')
   },
   configureWebpack: {
     // provide the app's title in webpack's name field, so that