can't show flowchart and Sequence Diagram about markdown-it-vue HOT 3 CLOSED

    ```mermaid
    graph LR
        start((用户登录 )) --> operation[用户操作 ]
        operation --> cond{登陆成功?}
        cond -- yes --> yes[进入后台]
        cond -- no --> operation
    ```

  ```
  sequenceDiagram
    Andrew->China: Says Hello 
    Note right of China: China thinks\nabout it 
    China-->Andrew: How are you? 
    Andrew->>China: I am good thanks!
  ```