Question

intellij idea 包含 webstorm的功能吗

Answer 1

是得，官方说明中特别指出了这一点。
IntelliJ IDEA remains JetBrains' flagship product and IntelliJ IDEA provides full JavaScript support along with *all* other features of WebStorm via bundled or downloadable plugins. The only thing missing is the simplified project setup.
只是在项目设置上可能没有webstorm简单。毕竟webstorm只是针对前端，功能有针对性。Intellij idea比较重量级，功能较多。设置可能复杂一点。