boxWidth = document.createElement('input') boxWidth.setAttribute('type','text') boxWidth.setAttribute('id','boxWidth') boxWidth.setAttribute('value','20') boxSize = document.getElementById('boxSize') boxSize.append(boxWidth)

index부터 count만큼 삭제 shapes.splice(selectedShapeIndex,1)전체 삭제const array = [ 1, 2, 3, 4, 5];array.splice(0, array.lengh);