出现问题：

import Vuex from ‘vuex’;
Vue.use(Vuex);
安装导入vuex后，在终端执行npm run serve后出现WARNING，网页中vue无法启动

 WARNING  Compiled with 3 warnings                                                                       10:33:05
 warning  in ../node_modules/vuex/dist/vuex.esm-bundler.js

export 'inject' (imported as 'inject') was not found in 'vue' (possible exports: default)

 warning  in ../node_modules/vuex/dist/vuex.esm-bundler.js

export 'reactive' (imported as 'reactive') was not found in 'vue' (possible exports: default)

 warning  in ../node_modules/vuex/dist/vuex.esm-bundler.js

export 'watch' (imported as 'watch') was not found in 'vue' (possible exports: default)