兼容export xx from yy 语法

lib/compile-vue.js

@@ -157,8 +157,8 @@ export function parseJs(
     .replace(/\r\n/g, '\n')
     .replace(/process\.env\.NODE_ENV/g, `'${process.env.NODE_ENV}'`)
     .replace(
-      /import ([\w\W]*?) from (["'])(.*?)\2/g,
-      function (m, alias, q, name) {
+      /(import|export) ([\w\W]*?) from (["'])(.*?)\3/g,
+      function (m, t, alias, q, name) {
         if (name.startsWith('@/')) {
           name = name.replace('@/', urlJoin(DEPLOY_PATH, ASSETS_DIR))
         }
@@ -190,7 +190,9 @@ export function parseJs(
         if (isBuild) {
           name = name.replace(/\.vue$/, '.js')
         }
-        return `import ${alias} from '${name}'`
+        return `import ${alias} from '${name}'${
+          t === 'export' ? `\nexport ${alias}` : ''
+        }`
       }
     )
     .replace(/import\((['"])(.*?)\1\)/g, function (m, q, name) {