网页设计：html js css
框架层：bootstrap semanticui vuetify element-ui
数据维护: vue react angular
npm install -g @vue/cli vue create my-project cd frontend_lagou4 npm run serve #vue ui
Access to XMLHttpRequest at 'http://127.0.0.1:5000/testcase' from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.