为什么`code_folding:隐藏不允许在Rmarkdown中隐藏/显示代码？

Question

这是我的Rmarkdown代码：

---
title: "Tutorial"
output:learnr::tutorial:
    code_folding: hide
runtime: shiny_prerendered
---

```{r setup}

图书馆(Learnr)

Knitr：：opts_chunk$set(回声=假)

## Topic 1

### Exercise 

*Here's a simple exercise with an empty code chunk provided for entering the answer.*

Write the R code required to add two plus two:

```{r two-plus-two, exercise=TRUE}

图书馆(Tidyverse)

%>%选择(cyl，mpg)

### Exercise with Code

*Here's an exercise with some prepopulated code as well as `exercise.lines = 5` to provide a bit more initial room to work.*

Now write a function that adds any two numbers and then call it:

```{r add-function, exercise=TRUE, exercise.lines = 5}

添加<- function() {

}

我已经试过了所有的选择，但都没有用。有什么帮助吗？

Answer 1

看起来，code-folding选项不适用于output "learnr"。

为了html_doc -是的。F.e.：

output:
  html_document:
    code_folding: hide

但是您可以使用details尝试下一个解决方案。

CSS:

<style>
details {
    border: 1px solid;
    border-radius: 10px;
    padding: .1em .5em 0;
    text-align: right;
}
</style>

使用：

<details>
<summary>Show/hide code</summary>
```{r two-plus-two, exercise=TRUE}

图书馆(Tidyverse)

%>%选择(cyl，mpg)

</details>

输出：

​

​

P.S.如果您需要对IE/Edge的支持，请看there