https://youtu.be/RIPYsKx1iiU 1. checkboxes This is an inbox layout. Check one item inbox라는 박스안에 각 checkbox가 존재. 2. e.shiftKey const checkboxes = document.querySelectorAll( '.inbox input[type="checkbox"]' ); let lastChecked; function handlecheck(e) { let inBetween = false; if (e.shiftKey && this.checked) { checkboxes.forEach((checkbox) => { if (checkbox === this || checkbox === lastChecked) { inB..
