如何使用dart:html获取当前所选内容的文本或内部html?我使用div的事件作为开始:
<div on-mouseup="{{on_mouseup}}">
void on_mouseup(MouseEvent e, var detail, DivElement src) {
final selection = window.getSelection();
// do somthing
// ..
// final selectedText = ..;
window.alert("Selected text is $selecte