When js blocks the "backspace" and "enter" keys on the whole page, can it be left unblocked in the red box alone?

Html css javascript
Apr.11,2021

something like this: 

var $textarea = document.querySelector('-sharpfoo')

document.addEventListener('keydown', function(event){
  var needPrevent = true
  var tar = event.srcElement || event.target

  if(event.keyCode == 8) {
    if($textarea == tar) {
      needPrevent = false
    }
    
    if(needPrevent) {
    event.preventDefault();
    return false;
    }
  }
})
The idea of

is very simple, that is, to determine which source node of the trigger event is. I simply use = = to make a reference comparison about the logic of the decision, which can be extended to custom logic.

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