用闪亮的 R 设计 DT 中的展开行按钮

我正在尝试设计 DT 中可用的展开行按钮的样式。样式可用here https://datatables.net/examples/api/row_details.html。我用于创建数据表的代码是-

library(DT)
datatable(
  cbind(' ' = '⊕', mtcars), escape = -2,
  options = list(
    columnDefs = list(
      list(visible = FALSE, targets = c(0, 2, 3)),
      list(orderable = FALSE, className = 'details-control', targets = 1)
    )
  ),
  callback = JS("
  table.column(1).nodes().to$().css({cursor: 'pointer'});
  var format = function(d) {
    return '<div style=\"background-color:#eee; padding: .5em;\"> Model: ' +
            d[0] + ', mpg: ' + d[2] + ', cyl: ' + d[3] + '</div>';
  };
  table.on('click', 'td.details-control', function() {
    var td = $(this), row = table.row(td.closest('tr'));
    if (row.child.isShown()) {
      row.child.hide();
      td.html('&oplus;');
    } else {
      row.child(format(row.data())).show();
      td.html('&CircleMinus;');
    }
  });"
))*

我不太熟悉 JS，所以我不知道从哪里开始。我尝试使用链接中的 JS 和 CSS 文件，但未能取得任何进展。任何线索表示赞赏，谢谢！

如果您在浏览器中打开表，则效果如下（这在 RStudio 查看器中不起作用）。但我怀疑有一个更简单的解决方案...而且这个解决方案依赖于 Github 上托管的图像，这不是很酷...

library(DT)
datatable(
  cbind(' ' = '<img src=\"https://raw.githubusercontent.com/DataTables/DataTables/master/examples/resources/details_open.png\"/>', 
        mtcars), escape = -2,
  options = list(
    columnDefs = list(
      list(visible = FALSE, targets = c(0, 2, 3)),
      list(orderable = FALSE, className = 'details-control', targets = 1)
    )
  ),
  callback = JS("
                table.column(1).nodes().to$().css({cursor: 'pointer'});
                var format = function(d) {
                return '<div style=\"background-color:#eee; padding: .5em;\"> Model: ' +
                d[0] + ', mpg: ' + d[2] + ', cyl: ' + d[3] + '</div>';
                };
                table.on('click', 'td.details-control', function() {
                var td = $(this), row = table.row(td.closest('tr'));
                if (row.child.isShown()) {
                row.child.hide();
                td.html('<img src=\"https://raw.githubusercontent.com/DataTables/DataTables/master/examples/resources/details_open.png\"/>');
                } else {
                row.child(format(row.data())).show();
                td.html('<img src=\"https://raw.githubusercontent.com/DataTables/DataTables/master/examples/resources/details_close.png\"/>');
                }
                });"
))