collpase在mozilla中不起作用，但在chrome中起作用

Question

Collapse doesn't seem to work in mozilla firefox but works perfectly in chrome.Here is an example

 var r1 = window.getSelection().getRangeAt(0);
 var r2 = window.getSelection().getRangeAt(0);
 console.log(r1.collapsed);  // It is false Now
 console.log(r2.collapsed);  // It is false Now
 r1.collapse(true);

Now when you set the r1.collpase to true,r2.collapsed is set to true.But when you try set r2.collapse to false,it remains true.

 r2.collapse(false);
 console.log(r2.collapsed); //true

I think this is a firefox bug.Correct me if i am wrong.Is there any workaround this in firefox?

Answer 1

For Firefox Selection Range https://developer.mozilla.org/en-US/docs/Web/API/Range/collapsed https://developer.mozilla.org/en-US/docs/Web/API/Range/collapse

The collapse parameters just say in which direction you want to collapse the selection. But after that, it's always collapsed.