how to disable Backspace as the delete-key-code?

[muyu1944]

when i set ”multi-selection-key-code“ to another key, it works, and the default key Meta not work any more.
when i set ”delete-key-code“ to another key, it works, but the default key Backspace still works.
how do i set this parameter to disable Backspace as the delete-key-code?

[muyu1944]

btw, i used the iife.js from jsdelivr in pure html+js enviromment.
in the example page of the offcial web site, i modified the source app.vue as "", Backspace not works any more, but in html i wrote "", Backspace still works.