diff --git a/build/webpack.base.conf.js b/build/webpack.base.conf.js
index 3b946b4b..2d8ec5b8 100644
--- a/build/webpack.base.conf.js
+++ b/build/webpack.base.conf.js
@@ -23,7 +23,7 @@ const createLintingRule = () => ({
 module.exports = {
   context: path.resolve(__dirname, '../'),
   entry: {
-    app: './src/main.js'
+    app: ['babel-polyfill', './src/main.js']
   },
   output: {
     path: config.build.assetsRoot,
diff --git a/build/webpack.dev.conf.js b/build/webpack.dev.conf.js
index 26a5584a..b3b95bee 100644
--- a/build/webpack.dev.conf.js
+++ b/build/webpack.dev.conf.js
@@ -59,9 +59,9 @@ const devWebpackConfig = merge(baseWebpackConfig, {
       favicon: resolve('favicon.ico'),
       title: 'vue-element-admin',
       templateParameters: {
-        BASE_URL: config.dev.assetsPublicPath + config.dev.assetsSubDirectory,
-      },
-    }),
+        BASE_URL: config.dev.assetsPublicPath + config.dev.assetsSubDirectory
+      }
+    })
   ]
 })
 
diff --git a/build/webpack.prod.conf.js b/build/webpack.prod.conf.js
index 4f84e0c6..5fa029a0 100644
--- a/build/webpack.prod.conf.js
+++ b/build/webpack.prod.conf.js
@@ -57,7 +57,7 @@ const webpackConfig = merge(baseWebpackConfig, {
       favicon: resolve('favicon.ico'),
       title: 'vue-element-admin',
       templateParameters: {
-        BASE_URL: config.build.assetsPublicPath + config.build.assetsSubDirectory,
+        BASE_URL: config.build.assetsPublicPath + config.build.assetsSubDirectory
       },
       minify: {
         removeComments: true,
@@ -71,7 +71,7 @@ const webpackConfig = merge(baseWebpackConfig, {
       // matter anyway
     }),
     new ScriptExtHtmlWebpackPlugin({
-      //`runtime` must same as runtimeChunk name. default is `runtime`
+      // `runtime` must same as runtimeChunk name. default is `runtime`
       inline: /runtime\..*\.js$/
     }),
     // keep chunk.id stable when chunk has no name
diff --git a/package.json b/package.json
index e5b0b9ec..d3cb8427 100644
--- a/package.json
+++ b/package.json
@@ -72,6 +72,7 @@
     "babel-plugin-syntax-jsx": "6.18.0",
     "babel-plugin-transform-runtime": "6.23.0",
     "babel-plugin-transform-vue-jsx": "3.7.0",
+    "babel-polyfill": "^6.26.0",
     "babel-preset-env": "1.7.0",
     "babel-preset-stage-2": "6.24.1",
     "chalk": "2.4.1",
@@ -89,9 +90,9 @@
     "html-webpack-plugin": "4.0.0-alpha",
     "husky": "0.14.3",
     "lint-staged": "7.2.2",
-    "mini-css-extract-plugin": "0.4.1",
+    "mini-css-extract-plugin": "^0.4.1",
     "node-notifier": "5.2.1",
-    "node-sass": "^4.7.2",
+    "node-sass": "^4.11.0",
     "optimize-css-assets-webpack-plugin": "5.0.0",
     "ora": "3.0.0",
     "path-to-regexp": "2.4.0",
@@ -100,7 +101,7 @@
     "postcss-loader": "2.1.6",
     "postcss-url": "7.3.2",
     "rimraf": "2.6.2",
-    "sass-loader": "7.0.3",
+    "sass-loader": "^7.0.3",
     "script-ext-html-webpack-plugin": "2.0.1",
     "script-loader": "0.7.2",
     "semver": "5.5.0",