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我正在学习 Shinyapps.io 和闪亮。我希望用它来教学。我想运行一些计算，从 Rmd 生成一个 html 文件，并在新选项卡中的用户浏览器中向用户显示该 html 文件。我可以使用 Pander 的 openFileInOS 在我的 Windows 7 上使用 RStudio 执行此操作。我可以使用 Render ... 在闪亮的选项卡中显示这个 html 文件，但不能在浏览器的新选项卡中显示。我该怎么做呢？

# File Downloader. Needs report.rmd in the current directory to make it work
# https://shiny.rstudio.com/articles/generating-reports.html  Winston Chang, July 2016

library(shiny)
library(here)
here::here()

  ui = fluidPage(
    sliderInput("slider", "Slider", 1, 100, 50),
    downloadButton("report", "Generate report")
  )


  server = function(input, output) {
    output$report <- downloadHandler(
      # For PDF output, change this to "report.pdf"
      filename = "report.html",
      content = function(file) {
        # Copy the report file to a temporary directory before processing it, in
        # case we don't have write permissions to the current working dir (which
        # can happen when deployed).
        tempReport <- file.path(tempdir(), "report.Rmd")
        file.copy("report.Rmd", tempReport, overwrite = TRUE)

        # Set up parameters to pass to Rmd document
        params <- list(n = input$slider)

        # Knit the document, passing in the `params` list, and eval it in a
        # child of the global environment (this isolates the code in the document
        # from the code in this app).
        rmarkdown::render(tempReport, output_file = file,
                          params = params,
                          envir = new.env(parent = globalenv()) 

                        ) # downloads report.html

# ???        
# How do I open the report.html file in a NEW tab in Browser, not a tab within Shiny?    
#                          
       # )
      } # content ends
    ) # downloadHandler ends
  } # server ends

  shinyApp(ui = ui, server = server)

任何 rmd 文件。这是report.rmd文件代码

---
title: "Dummy Report"
author: "John Doe "
date: "April 13, 2019"
output: html_document
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)

R 降价

这是一个 R Markdown 文档。Markdown 是一种用于创作 HTML、PDF 和 MS Word 文档的简单格式化语法。有关使用 R Markdown 的更多详细信息，请参阅http://rmarkdown.rstudio.com。

当您单击Knit按钮时，将生成一个文档，其中包括内容以及文档中任何嵌入式 R 代码块的输出。您可以像这样嵌入 R 代码块：

summary(cars)

包括地块

您还可以嵌入绘图，例如：

plot(pressure)

请注意，该echo = FALSE参数已添加到代码块中以防止打印生成绘图的 R 代码。

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