fixed webpack devserver to serve router subpath

build/webpack.config.base.js

@@ -2,6 +2,7 @@
 
 const HtmlWebpackPlugin = require('html-webpack-plugin')
 const CopyWebpackPlugin = require('copy-webpack-plugin')
+const HtmlWebpackHarddiskPlugin = require('html-webpack-harddisk-plugin');
 const { VueLoaderPlugin } = require('vue-loader')
 
 const utils = require('./utils')
@@ -67,8 +68,10 @@ module.exports = {
     new HtmlWebpackPlugin({
       filename: 'index.html',
       template: 'index.html',
-      inject: true
+      inject: true,
+      alwaysWriteToDisk: true
     }),
+    new HtmlWebpackHarddiskPlugin(),
     new VueLoaderPlugin(),
     new CopyWebpackPlugin([{
       from: utils.resolve('static/img'),